| Larissa | - | 2024: India (Contestant 2: Bronze Medal) |
| Olivia | Aaronson | 2014: United Kingdom (Contestant 1), 2015: United Kingdom (Contestant 1: Silver Medal) |
| Mille Jordal | Aase | 2018: Norway (Contestant 4) |
| Javahir | Abbasova | 2016: Azerbaijan (Contestant 3), 2017: Azerbaijan (Contestant 1: Honourable Mention), 2018: Azerbaijan (Contestant 4) |
| Safwat | Abdelsalam | 2017: Saudi Arabia (Observer with Leader), 2018: Saudi Arabia (Observer with Leader), 2023: Saudi Arabia (Observer with Leader), 2024: Saudi Arabia (Observer with Leader), 2025: Saudi Arabia (Leader) |
| Alicja | Abramczuk | 2021: Poland (Contestant 1) |
| Amina | Abu Shanab | 2018: Romania (Contestant 3: Silver Medal), 2019: Romania (Contestant 2: Silver Medal), 2020: Romania (Contestant 3: Gold Medal) |
| Renad | Abualjamal | 2014: Saudi Arabia (Contestant 1), 2016: Saudi Arabia (Contestant 2: Bronze Medal), 2017: Saudi Arabia (Contestant 3: Bronze Medal), 2018: Saudi Arabia (Contestant 1: Bronze Medal) |
| Rola | Abualjamal | 2014: Saudi Arabia (Observer with Contestants) |
| Yahya | Abualjamal | 2016: Saudi Arabia (Observer with Contestants), 2017: Saudi Arabia (Observer with Contestants), 2018: Saudi Arabia (Observer with Contestants) |
| Mzia | Abzhandadze | 2018: Georgia (Contestant 4: Honourable Mention) |
| Kristel | Acuña García | 2020: Costa Rica (Contestant 1), 2021: Costa Rica (Contestant 1: Silver Medal), 2022: Costa Rica (Contestant 1: Honourable Mention) |
| Ali | Adalı | 2014: EGMO 2014 Staff (Coordinator) |
| Ilirjane | Ademaj | 2020: Kosovo (Leader) |
| Arto | Adili | 2021: Albania (Observer with Leader) |
| Ajat | Adriansyah | 2014: Indonesia (Deputy Leader) |
| Nazar | Agakhanov | 2013: EGMO 2013 Staff (Coordinator), 2016: Russian Federation (Leader), 2017: Russian Federation (Leader), 2018: Russian Federation (Leader) |
| Anushka | Aggarwal | 2019: India (Contestant 1: Bronze Medal), 2020: India (Contestant 1: Bronze Medal), 2021: India (Contestant 3), 2022: India (Contestant 2: Bronze Medal) |
| Gunjan | Aggarwal | 2021: India (Contestant 4), 2022: India (Contestant 3: Bronze Medal), 2023: India (Contestant 1: Silver Medal), 2024: India (Contestant 1: Silver Medal) |
| Tara | Aghajani | 2013: Luxembourg (Contestant 2: Honourable Mention) |
| Ismat | Aghayev | 2019: Azerbaijan (Deputy Leader), 2020: Azerbaijan (Deputy Leader), 2022: Azerbaijan (Deputy Leader), 2023: Azerbaijan (Leader) |
| Laman | Aghazada | 2020: Azerbaijan (Contestant 2), 2021: Azerbaijan (Contestant 4: Honourable Mention), 2022: Azerbaijan (Observer with Contestants) |
| Paraskevi | Agniadi | 2024: Greece (Contestant 1) |
| Francisca | Aguayo | 2019: Chile (Contestant 4) |
| Ibtihel | Aguibi | 2022: Tunisia (Contestant 3) |
| Catherine | Ahern | 2022: Ireland (Contestant 4) |
| Mirali | Ahmadli | 2024: Azerbaijan (Deputy Leader) |
| Dorlir | Ahmeti | 2021: Kosovo (Deputy Leader), 2025: EGMO 2025 Staff (Problem Selection, Coordinator) |
| Viktor | Ahmeti | 2025: EGMO 2025 Staff (Coordinator) |
| JuHyun | Ahn | 2018: Ireland (Contestant 1: Honourable Mention) |
| Arben | Ajredini | 2025: EGMO 2025 Staff (Coordinator) |
| Milania | Akchurina | 2025: Ukraine (Contestant 1: Bronze Medal) |
| Betül | Akdaş | 2020: Türkiye (Contestant 1: Bronze Medal), 2021: Türkiye (Contestant 1: Bronze Medal) |
| Afsana | Akter | 2022: Bangladesh (Contestant 4: Honourable Mention), 2023: Bangladesh (Contestant 3: Bronze Medal), 2024: Bangladesh (Contestant 3: Honourable Mention) |
| Ugnė | Alaburdaitė | 2018: Lithuania (Contestant 1: Honourable Mention) |
| Albatool | Alaidarous | 2025: Saudi Arabia (Contestant 4: Honourable Mention) |
| Arifa | Alam | 2021: Bangladesh (Contestant 2), 2022: Bangladesh (Contestant 3: Honourable Mention), 2023: Bangladesh (Contestant 4: Bronze Medal) |
| Ameen | ALameer | 2023: Saudi Arabia (Observer with Contestants) |
| Farhah | ALameer | 2023: Saudi Arabia (Contestant 3) |
| Abeer | Alamri | 2019: Saudi Arabia (Observer with Contestants) |
| Khadijah | Alamri | 2014: Saudi Arabia (Observer with Contestants) |
| Dhamaris | Alarcon | 2025: Peru (Contestant 1: Silver Medal) |
| Yasmine | Alaya | 2021: Tunisia (Contestant 1: Bronze Medal) |
| Sultan | ALbarakati | 2015: Saudi Arabia (Leader), 2016: Saudi Arabia (Leader), 2017: Saudi Arabia (Leader), 2018: Saudi Arabia (Leader), 2019: Saudi Arabia (Leader), 2020: Saudi Arabia (Leader), 2021: Saudi Arabia (Leader), 2022: Saudi Arabia (Leader), 2023: Saudi Arabia (Leader) |
| Camilla | Alberg | 2021: Norway (Contestant 3) |
| Katharina | Albert | 2018: Germany (Contestant 2) |
| Angie | Alcantara | 2020: Peru (Contestant 4: Bronze Medal), 2021: Peru (Contestant 4: Silver Medal) |
| Maha | Aldawood | 2024: Saudi Arabia (Deputy Leader), 2025: Saudi Arabia (Deputy Leader) |
| Ruba | Aldhaheri | 2014: Saudi Arabia (Contestant 4) |
| Ali | ALdossari | 2023: Saudi Arabia (Observer with Contestants) |
| Jana | ALdossari | 2022: Saudi Arabia (Contestant 4: Honourable Mention), 2023: Saudi Arabia (Contestant 1: Bronze Medal) |
| Matej | Aleksandrov | 2013: Slovenia (Leader) |
| Andrei | Alexandrescu | 2016: EGMO 2016 Staff (Deputy Chief Guide) |
| Cristian | Alexandrescu | 2016: EGMO 2016 Staff (Chief Invigilator, Coordinator) |
| Konstantina | Alexandridou | 2020: Greece (Contestant 1) |
| Alberto | Alfarano | 2018: Italy (Deputy Leader) |
| Ahmed | Alghamdi | 2016: Saudi Arabia (Observer with Contestants) |
| Razan | Alghamdi | 2016: Saudi Arabia (Contestant 3) |
| Fatimeh | Alghannam | 2021: Saudi Arabia (Contestant 4: Bronze Medal) |
| Zakiya | Alhassin | 2014: Saudi Arabia (Observer with Contestants) |
| Thana | ALhydary | 2018: Saudi Arabia (Contestant 2: Silver Medal), 2019: Saudi Arabia (Contestant 1: Bronze Medal), 2020: Saudi Arabia (Contestant 1: Silver Medal) |
| Imana | Alibašić | 2020: Bosnia and Herzegovina (Contestant 2), 2022: Bosnia and Herzegovina (Contestant 2: Bronze Medal), 2025: Bosnia and Herzegovina (Deputy Leader) |
| Kamila | Aliyarova | 2025: Kyrgyzstan (Contestant 2: Honourable Mention) |
| İlham | Aliyev | 2014: EGMO 2014 Staff (Coordinator) |
| Lumiyya | Aliyeva | 2016: Azerbaijan (Deputy Leader) |
| Rena | Aliyeva | 2016: Azerbaijan (Contestant 2), 2017: Azerbaijan (Contestant 3) |
| Shams | Aliyeva | 2017: Azerbaijan (Contestant 4), 2018: Azerbaijan (Contestant 3), 2019: Azerbaijan (Contestant 3: Honourable Mention) |
| Rafail | Alizade | 2014: EGMO 2014 Staff (Coordinator) |
| Nurayet | Alımlı | 2022: Türkiye (Observer with Leader) |
| Velid | Alıtı | 2014: EGMO 2014 Staff (Guide: Albania, Slovenia) |
| Amal | ALjadani | 2023: Saudi Arabia (Observer with Contestants) |
| Doha | Aljeddawi | 2012: Saudi Arabia (Contestant 1) |
| Amerah | Aljefry | 2025: Saudi Arabia (Observer with Contestants) |
| Safa | Aljughayman | 2024: Saudi Arabia (Observer with Contestants), 2025: Saudi Arabia (Observer with Contestants) |
| Sarah | Aljughayman | 2024: Saudi Arabia (Contestant 3), 2025: Saudi Arabia (Contestant 2: Bronze Medal) |
| Hesham | Aljughiman | 2025: Saudi Arabia (Observer with Contestants) |
| Husain | Aljwir Alsunaidi | 2012: Saudi Arabia (Observer with Contestants) |
| Ghufran | Alkhamis | 2014: Saudi Arabia (Contestant 3) |
| Marwan | Alkhayat | 2025: EGMO 2025 Staff (Coordinator) |
| Rugilė | Alkovikaitė | 2022: Lithuania (Contestant 1) |
| Cemile | Alkur | 2014: EGMO 2014 Staff (Guide: United States of America) |
| Courtney | Allen | 2025: Canada (Deputy Leader) |
| Marijke | Allis | 2020: EGMO 2020 Staff (Organiser) |
| Majid | Almarhoumi | 2025: Saudi Arabia (Observer with Leader) |
| Norah | Alnasser | 2015: Saudi Arabia (Deputy Leader), 2016: Saudi Arabia (Deputy Leader) |
| Anastasiia | Alokhina | 2013: Ukraine (Contestant 1: Silver Medal), 2014: Ukraine (Contestant 1: Gold Medal), 2015: Ukraine (Contestant 1: Gold Medal), 2019: EGMO 2019 Staff (Coordinator) |
| Shukri | Alsaleh | 2024: Saudi Arabia (Observer with Contestants) |
| Retaj | ALsaleh | 2023: Saudi Arabia (Contestant 2), 2024: Saudi Arabia (Contestant 2: Honourable Mention), 2025: Saudi Arabia (Contestant 3: Honourable Mention) |
| Abdulmonem | Alshaikh | 2012: Saudi Arabia (Observer with Contestants) |
| Abrar | Alshaikh | 2012: Saudi Arabia (Contestant 2: Bronze Medal) |
| Modi | Alshammari | 2014: Saudi Arabia (Observer with Contestants), 2015: Saudi Arabia (Observer with Contestants), 2016: Saudi Arabia (Observer with Contestants), 2017: Saudi Arabia (Observer with Contestants), 2019: Saudi Arabia (Observer with Contestants) |
| Shaden | Alshammari | 2014: Saudi Arabia (Contestant 2), 2015: Saudi Arabia (Contestant 1: Bronze Medal), 2016: Saudi Arabia (Contestant 1: Gold Medal), 2017: Saudi Arabia (Contestant 1: Gold Medal), 2019: Saudi Arabia (Deputy Leader), 2020: Saudi Arabia (Deputy Leader), 2021: Saudi Arabia (Observer with Contestants) |
| Volha | Alsheuskaya | 2015: EGMO 2015 Staff (Guide: Republic of Moldova, Ukraine) |
| Amaal | Alsunaidi | 2012: Saudi Arabia (Contestant 3) |
| Joseph | Altamirano | 2022: Peru (Observer with Leader) |
| Safwat | Altanany | 2021: Saudi Arabia (Observer with Leader), 2022: Saudi Arabia (Observer with Leader) |
| Anu | Altangerel | 2025: Mongolia (Contestant 4: Bronze Medal) |
| Najla | Altwaijry | 2012: Saudi Arabia (Leader), 2014: Saudi Arabia (Leader) |
| Sabrina | Alushi | 2021: Albania (Contestant 2), 2022: Albania (Contestant 2) |
| Fernando Alberto | Alvarez | 2017: Ecuador (Deputy Leader), 2018: Ecuador (Deputy Leader), 2019: Ecuador (Observer with Leader) |
| Jana | Alzahrani | 2019: Saudi Arabia (Contestant 4) |
| Elene | Amaglobeli | 2024: EGMO 2024 Staff (Guide: Poland) |
| Aruzhan | Amanbayeva | 2017: Kazakhstan (Contestant 1: Gold Medal), 2018: Kazakhstan (Contestant 1: Gold Medal), 2023: Kazakhstan (Deputy Leader), 2024: EGMO 2024 Staff (Coordinator) |
| Nazar | Amanov | 2014: EGMO 2014 Staff (Guide: Norway) |
| Purevzaya | Amarzaya | 2018: Mongolia (Contestant 2: Bronze Medal) |
| Ani | Ambroladze | 2024: EGMO 2024 Staff (Guide: Denmark) |
| Elzė | Amilevičiūtė | 2019: Lithuania (Contestant 1), 2020: Lithuania (Contestant 1) |
| Serena | An | 2021: United States of America (Contestant 1: Gold Medal), 2024: United States of America (Deputy Leader), 2025: United States of America (Deputy Leader) |
| Elnura | Anarbai kyzy | 2021: Kyrgyzstan (Contestant 1: Bronze Medal), 2022: Kyrgyzstan (Contestant 1) |
| Angelika | Andó | 2017: Hungary (Contestant 4: Silver Medal) |
| Inga | Andreeva | 2018: Russian Federation (Deputy Leader) |
| Adelina | Andrei | 2019: Republic of Moldova (Contestant 3: Bronze Medal), 2020: Republic of Moldova (Contestant 3: Bronze Medal), 2021: Republic of Moldova (Contestant 1: Gold Medal), 2022: Republic of Moldova (Contestant 1: Silver Medal) |
| Dorin | Andrica | 2016: EGMO 2016 Staff (Coordinator) |
| Marian | Andronache | 2016: EGMO 2016 Staff (Problem Selection, Coordinator) |
| Dace | Andžāne | 2017: Latvia (Deputy Leader), 2019: Latvia (Deputy Leader) |
| Nicolae | Angelescu | 2016: EGMO 2016 Staff (Staff) |
| Maria | Angelika - Nikita | 2018: Greece (Contestant 2: Honourable Mention) |
| Daniele | Angella | 2018: EGMO 2018 Staff (Staff) |
| Raphael | Angst | 2023: EGMO 2023 Staff (Coordinator) |
| Giuseppe | Anichini | 2018: EGMO 2018 Staff (Staff) |
| Andrii | Anikushyn | 2013: Ukraine (Leader), 2014: Ukraine (Leader), 2015: Ukraine (Leader), 2016: Ukraine (Leader), 2017: Ukraine (Leader), 2018: Ukraine (Leader), 2019: EGMO 2019 Staff (Jury Chair), 2020: Ukraine (Leader), 2021: Ukraine (Leader), 2022: Ukraine (Leader), 2023: Ukraine (Leader), 2024: Ukraine (Leader), 2025: Ukraine (Leader) |
| Ştefana-Lucia | Aniţa | 2012: Romania (Contestant 3: Silver Medal) |
| Misheel | Ankhbayar | 2022: Mongolia (Contestant 3: Honourable Mention), 2025: Mongolia (Contestant 2: Bronze Medal) |
| Dankowsky | Anna Zóra | 2022: EGMO 2022 Staff (Deputy Chief Guide, Organiser) |
| Gioacchino | Antonelli | 2018: EGMO 2018 Staff (Staff, Coordinator) |
| Camila Rosario | Antonio Villarroel | 2021: Bolivia (Contestant 3) |
| Clara | Antonucci | 2013: Italy (Contestant 1: Bronze Medal), 2014: Italy (Contestant 1: Silver Medal), 2018: EGMO 2018 Staff (Coordinator) |
| Ella | Anttila | 2015: Finland (Contestant 1), 2016: Finland (Contestant 1: Bronze Medal) |
| Ko | Aoki | 2021: Japan (Deputy Leader) |
| Alin | Apostu | 2016: EGMO 2016 Staff (Guide: Lithuania) |
| Jovanna | Apráez Enríquez | 2022: Ecuador (Contestant 2) |
| Amir Reza | Arab | 2014: Islamic Republic of Iran (Leader) |
| Dimitri | Arabidze | 2016: Georgia (Deputy Leader), 2017: Georgia (Deputy Leader), 2018: Georgia (Deputy Leader), 2019: Georgia (Deputy Leader), 2020: Georgia (Deputy Leader), 2021: Georgia (Deputy Leader) |
| Sena Nur | Arbağ | 2012: Türkiye (Contestant 1: Silver Medal), 2013: Türkiye (Contestant 1: Silver Medal) |
| Victoria | Arenas | 2016: Spain (Contestant 2) |
| Helena | Arendacz | 2023: Poland (Contestant 1: Silver Medal) |
| Meriem | Arif | 2024: Algeria (Contestant 3) |
| Maria José | Aristizabal | 2024: Colombia (Contestant 3) |
| W. K. Samantha Lakmini | Ariyaratna | 2025: Sri Lanka (Deputy Leader) |
| Hüseyin | Arı | 2014: EGMO 2014 Staff (Guide: Saudi Arabia) |
| Murat | Arıbaş | 2014: EGMO 2014 Staff (TÜBİTAK) |
| Vanessza | Árki | 2022: EGMO 2022 Staff (Guide: Mexico) |
| Andrii | Arman | 2019: EGMO 2019 Staff (Coordinator) |
| Susanne | Armbruster | 2018: Germany (Leader), 2019: Germany (Leader), 2020: Germany (Leader), 2021: Germany (Leader), 2022: Germany (Leader), 2023: Germany (Leader), 2024: Germany (Leader), 2025: Germany (Leader) |
| Irene | Armesto Méndez | 2023: Spain (Contestant 1: Honourable Mention) |
| Isabel | Arnáiz Vega | 2025: Spain (Contestant 1) |
| Ilina | Arsovska | 2025: North Macedonia (Contestant 2) |
| Evgeniya | Artemova | 2019: Australia (Contestant 4: Silver Medal) |
| Shruti | Arun | 2025: United States of America (Contestant 1: Gold Medal) |
| Nastaran | Asadi Zanjani | 2017: EGMO 2017 Staff (Leader Guide) |
| Fatima | Asadova | 2024: Azerbaijan (Contestant 3) |
| Gunel | Asadova | 2019: Azerbaijan (Observer with Deputy) |
| Yasuharu | Asai | 2015: Japan (Observer with Deputy), 2016: Japan (Observer with Deputy), 2018: Japan (Observer with Deputy) |
| Salome | Asatiani | 2024: EGMO 2024 Staff (Guide: Mongolia) |
| Maaike | Assendorp | 2020: EGMO 2020 Staff (Organiser) |
| Ariadni | Assou | 2016: Cyprus (Contestant 2) |
| Kyriaki | Assou | 2022: Cyprus (Contestant 1: Honourable Mention), 2023: Cyprus (Contestant 1), 2024: Cyprus (Contestant 1) |
| Marija | Atanasova | 2021: North Macedonia (Contestant 1: Gold Medal), 2022: North Macedonia (Contestant 2: Bronze Medal) |
| Maria | Athanasiou | 2020: Greece (Contestant 2) |
| Ross | Atkins | 2012: EGMO 2012 Staff (Staff) |
| Vaiva | Augustinaitė | 2015: Lithuania (Contestant 1), 2016: Lithuania (Contestant 1: Bronze Medal) |
| Aino | Aulanko | 2021: Finland (Contestant 1), 2022: Finland (Contestant 1), 2023: Finland (Contestant 1: Silver Medal), 2024: Finland (Contestant 1: Gold Medal), 2025: Finland (Deputy Leader) |
| Danai-Christina | Avdela | 2019: Greece (Contestant 1: Honourable Mention) |
| Arbër | Avdullahu | 2025: EGMO 2025 Staff (Coordinator) |
| Emile | Averous | 2025: EGMO 2025 Staff (Coordinator) |
| Maruta | Avotina | 2013: Latvia (Deputy Leader), 2015: Latvia (Deputy Leader) |
| Olga | Axell | 2013: Sweden (Contestant 1: Honourable Mention) |
| Elif | Aydın | 2014: Türkiye (Contestant 1) |
| Aisha | Azhgaliyeva | 2023: Switzerland (Contestant 1: Bronze Medal), 2025: Switzerland (Deputy Leader) |
| Sena | Azis | 2016: Romania B (Leader) |
| Fidan | Babayeva | 2018: Azerbaijan (Contestant 2), 2019: Azerbaijan (Contestant 4) |
| Sofia | Babic | 2022: Ireland (Contestant 1) |
| Milica | Babić | 2016: Bosnia and Herzegovina (Contestant 4: Bronze Medal) |
| Tijana | Babić | 2016: Bosnia and Herzegovina (Contestant 3: Silver Medal), 2017: Bosnia and Herzegovina (Contestant 1: Gold Medal), 2018: Bosnia and Herzegovina (Contestant 1: Silver Medal), 2020: Bosnia and Herzegovina (Deputy Leader), 2021: Bosnia and Herzegovina (Deputy Leader) |
| Nathalie | Bäbler | 2017: Switzerland B (Contestant 3: Bronze Medal) |
| Dzmitry | Babrou | 2015: EGMO 2015 Staff (Problem Selection, Coordinator) |
| Samuel | Bach | 2013: France (Deputy Leader) |
| Gerlind | Bachmann | 2018: EGMO 2018 Staff (Guide: Austria, Switzerland) |
| Ágnes | Backhausz | 2012: Hungary (Leader), 2013: Hungary (Leader), 2022: EGMO 2022 Staff (Organiser) |
| Ulf | Backlund | 2013: Sweden (Leader) |
| Andreea | Bădică | 2016: EGMO 2016 Staff (Invigilator) |
| Mariam | Baghdasaryan | 2023: Poland (Contestant 2: Bronze Medal) |
| Selim | Bahadır | 2012: Türkiye (Deputy Leader), 2014: EGMO 2014 Staff (Problem Selection, Coordinator), 2016: Türkiye (Deputy Leader), 2020: Türkiye (Deputy Leader), 2021: Türkiye (Deputy Leader), 2023: Türkiye (Deputy Leader), 2024: Türkiye (Deputy Leader), 2025: Türkiye (Deputy Leader) |
| Atilla | Bahchedjioglou | 2019: EGMO 2019 Staff (Coordinator) |
| Joud | Bahuwayni | 2020: Saudi Arabia (Contestant 3: Bronze Medal), 2021: Saudi Arabia (Contestant 2: Bronze Medal), 2022: Saudi Arabia (Contestant 3: Honourable Mention) |
| Waleed | Bahuwayni | 2020: Saudi Arabia (Observer with Contestants) |
| Emily | Bain | 2012: United Kingdom (Observer with Contestants) |
| Katarina | Bajc | 2023: EGMO 2023 Staff (Guide: Finland) |
| Bruno | Bajo | 2025: EGMO 2025 Staff (Coordinator) |
| Elsa | Bajrami | 2025: EGMO 2025 Staff (Guide: Netherlands) |
| Patrik | Bak | 2019: Slovakia (Leader), 2020: Slovakia (Leader), 2021: Slovakia (Leader), 2022: Slovakia (Leader), 2025: Czechia (Deputy Leader) |
| Nursaulye | Bakhyt | 2018: Mongolia (Contestant 1: Bronze Medal) |
| Alisa | Baklan | 2019: Ukraine B (Contestant 1: Honourable Mention) |
| Marharyta | Baklan | 2019: Ukraine B (Contestant 2: Bronze Medal) |
| Niranjan | Balachandran | 2021: India (Deputy Leader) |
| Dariia | Balan | 2025: Ukraine (Contestant 2: Gold Medal) |
| Andrei Constantin | Bălan | 2016: EGMO 2016 Staff (Guide: Bulgaria) |
| Katerina | Balanova | 2017: EGMO 2017 Staff (Guide: Bulgaria) |
| Sury | Balasubramanian | 2021: India (Leader) |
| Svitlana | Balbukh | 2019: EGMO 2019 Staff (Guide: Brazil) |
| Alena | Bálintová | 2025: Slovakia (Contestant 4) |
| Denida | Balla | 2024: Albania (Contestant 2), 2025: Albania (Contestant 2) |
| Francesco | Ballini | 2018: EGMO 2018 Staff (Coordinator) |
| Tamás | Balogh | 2022: EGMO 2022 Staff (Entertainment) |
| Valeriu | Baltag | 2018: Republic of Moldova (Leader), 2023: Republic of Moldova (Leader) |
| Anca | Baltariga | 2019: Romania (Deputy Leader), 2020: Romania (Deputy Leader), 2021: Romania (Deputy Leader), 2022: Romania (Deputy Leader), 2023: Romania (Deputy Leader), 2024: Romania (Deputy Leader), 2025: Romania (Deputy Leader) |
| Mihail | Baluna | 2015: Romania (Leader), 2016: EGMO 2016 Staff (Jury Chair, EGMO AB, Problem Selection), 2017: Romania (Leader, EGMO AB), 2018: Romania (Leader), 2019: Romania (Leader), 2020: Romania (Leader), 2021: Romania (Leader), 2022: Romania (Leader), 2023: Romania (Leader), 2024: Romania (Leader), 2025: Romania (Leader) |
| Henry | Bambury | 2025: EGMO 2025 Staff (Coordinator) |
| Áron | Bán-Szabó | 2022: EGMO 2022 Staff (Guide: Costa Rica) |
| Oyunbilig | Bandi | 2025: Mongolia (Contestant 3: Honourable Mention) |
| Anna Mária | Bani-Akoto | 2022: EGMO 2022 Staff (Guide) |
| Leri | Bantsuri | 2024: Georgia B (Leader) |
| Yauheni | Barabanov | 2015: EGMO 2015 Staff (Problem Selection, Coordinator) |
| Nastya | Barabashchuk | 2019: EGMO 2019 Staff (Guide: Austria) |
| Zsuzsa | Baran | 2015: Hungary (Contestant 1: Gold Medal), 2016: Hungary (Contestant 1: Gold Medal), 2017: Hungary (Contestant 1: Gold Medal), 2022: Hungary (Deputy Leader), 2023: Hungary (Deputy Leader), 2024: Hungary (Deputy Leader) |
| Olexandr | Baranenko | 2019: EGMO 2019 Staff (Guide: Israel) |
| Zara | Barbarić | 2023: Slovenia B (Contestant 2), 2024: Slovenia (Contestant 1: Bronze Medal) |
| Letícia | Barbieri Stroeh | 2020: Brazil (Contestant 3: Bronze Medal), 2021: Brazil (Contestant 4: Bronze Medal) |
| Deborah | Barbosa Alves | 2018: Brazil (Leader), 2019: Brazil (Leader) |
| Elena | Barbu | 2016: EGMO 2016 Staff (Invigilator) |
| Valeria Estefania | Barco Santana | 2017: Ecuador (Contestant 4: Honourable Mention), 2018: Ecuador (Contestant 2), 2019: Ecuador (Contestant 1: Bronze Medal), 2024: Ecuador (Leader) |
| Adriana | Bardan | 2016: EGMO 2016 Staff (Staff) |
| Vedrana | Barisic | 2020: Norway (Contestant 2) |
| Filippo Gianni | Baroni | 2018: EGMO 2018 Staff (Coordinator) |
| Aleams | Barra | 2020: Indonesia (Leader) |
| Aifric | Barron | 2025: Ireland (Contestant 2: Honourable Mention) |
| Michele | Barsanti | 2018: EGMO 2018 Staff (Staff) |
| Tomáš | Bárta | 2020: Czechia (Leader) |
| Sopho | Bartia | 2024: EGMO 2024 Staff (Guide) |
| Andreas | Bärtschi | 2014: Switzerland (Leader), 2015: Switzerland (Observer with Leader), 2016: Switzerland (Deputy Leader), 2017: EGMO 2017 Staff (Organizing Committee) |
| Mara | Barucco | 2018: EGMO 2018 Staff (Staff) |
| Sena | Başaran | 2022: Türkiye (Contestant 1: Silver Medal), 2023: Türkiye (Contestant 1: Silver Medal), 2024: Türkiye (Contestant 1: Gold Medal) |
| Matija | Bašić | 2021: Croatia (Leader) |
| Ángela Diana | Bastidas | 2016: Ecuador (Contestant 1), 2017: Ecuador (Contestant 3: Honourable Mention) |
| Undral | Batbayasgalan | 2022: Mongolia (Contestant 1: Bronze Medal), 2023: Mongolia (Contestant 2: Bronze Medal) |
| Dolgormaa | Batsaikhan | 2018: Mongolia (Contestant 3: Silver Medal) |
| Aruzhan | Batyrkhan | 2024: Kazakhstan (Contestant 4: Bronze Medal) |
| Claudine | Bausch | 2020: Luxembourg (Deputy Leader) |
| Aysun | Bayramli | 2020: Azerbaijan (Contestant 4: Bronze Medal), 2021: Azerbaijan (Contestant 3) |
| Zahra | Bayramli | 2018: Azerbaijan (Contestant 1), 2019: Azerbaijan (Contestant 1: Honourable Mention), 2020: Azerbaijan (Contestant 1: Bronze Medal) |
| Wiktoria | Bazan | 2025: Poland (Contestant 3: Bronze Medal) |
| Naomi | Bazlov | 2019: United Kingdom (Contestant 1: Silver Medal), 2020: United Kingdom (Contestant 1: Silver Medal) |
| Loes | Bazuin | 2012: Netherlands (Contestant 1: Honourable Mention) |
| Dzmitry | Bazyleu | 2015: Belarus (Leader), 2023: Belarus (Leader), 2024: Belarus (Leader) |
| Emily | Beatty | 2018: United Kingdom (Contestant 1: Gold Medal), 2023: United Kingdom (Deputy Leader), 2024: United Kingdom (Deputy Leader), 2025: United Kingdom (Deputy Leader) |
| Irina | Bebekh | 2015: EGMO 2015 Staff (Organization Committee) |
| Erind | Bedalli | 2025: EGMO 2025 Staff (Coordinator) |
| Nika | Bedek | 2014: Slovenia (Contestant 1) |
| Natalie | Behague | 2012: United Kingdom (Contestant 1: Bronze Medal) |
| Mahsa | Behdadnia | 2014: EGMO 2014 Staff (Guide: Islamic Republic of Iran) |
| Tina | Behnia | 2014: Islamic Republic of Iran (Contestant 1: Bronze Medal) |
| Ninett | Beinschroth | 2022: Hungary B (Contestant 4) |
| Rumesa | Bejiqi | 2025: EGMO 2025 Staff (Guide: Bosnia and Herzegovina) |
| Loard | Bejko | 2024: Albania (Deputy Leader), 2025: EGMO 2025 Staff (Coordinator) |
| Csongor | Beke | 2022: EGMO 2022 Staff (Guide: Poland) |
| Floor | Beks | 2018: Netherlands (Contestant 1: Honourable Mention), 2019: Netherlands (Contestant 1: Silver Medal) |
| Nurzhan | Beksultanova | 2014: EGMO 2014 Staff (Guide: Mexico) |
| Anastasia | Belaya | 2024: Belarus (Contestant 2: Gold Medal) |
| Hacene | Belbachir | 2024: Algeria (Deputy Leader) |
| Aria | Belegu | 2025: EGMO 2025 Staff (Guide: New Zealand) |
| Hanna | Beleshava | 2017: Belarus (Contestant 3: Bronze Medal) |
| Nicolae | Beli | 2016: EGMO 2016 Staff (Coordinator) |
| Ana Marija | Belingar | 2023: EGMO 2023 Staff (Guide) |
| Francisco | Bellot | 2016: Spain (Leader), 2017: Spain (Leader) |
| Venkatachala | Belur Jana | 2015: India (Leader), 2017: India (Leader) |
| Chayma | Ben Chaabane | 2025: Tunisia (Contestant 3) |
| Shira | Ben Dor | 2016: Israel (Contestant 1: Silver Medal), 2017: Israel (Contestant 1: Silver Medal), 2025: Israel (Deputy Leader) |
| Imen | Ben El Haj Mabrouk | 2022: Tunisia (Contestant 1) |
| Molka | Ben Marzouk | 2017: Tunisia (Contestant 4: Honourable Mention), 2018: Tunisia (Contestant 2: Honourable Mention) |
| Aya | Ben Saad | 2017: Tunisia (Contestant 1), 2018: Tunisia (Contestant 3: Honourable Mention) |
| Ela | Ben Saad | 2018: Tunisia (Contestant 4) |
| Zohra | Benabad | 2013: EGMO 2013 Staff (Guide: Ireland, Netherlands, Romania, United States of America) |
| Giorgia | Benassi | 2018: Italy (Contestant 1: Bronze Medal), 2019: Italy (Contestant 1: Bronze Medal) |
| Mária | Bendová | 2019: Slovakia (Deputy Leader) |
| Sally-Anne | Bennett | 2012: EGMO 2012 Staff (Guide: United Kingdom) |
| Ana | Berc | 2023: EGMO 2023 Staff (Entertainment) |
| Ana-Teodora | Bercaru | 2018: Romania (Contestant 4) |
| Erika | Bérczi-Kovács | 2014: Hungary (Deputy Leader), 2022: EGMO 2022 Staff (Coordinator) |
| Tornike | Beria | 2024: EGMO 2024 Staff (Coordinator) |
| Adiat | Berisha | 2025: EGMO 2025 Staff (Guide: Switzerland) |
| Enea | Berisha | 2025: EGMO 2025 Staff (Guide: Czechia) |
| Rian | Berlajolli | 2025: EGMO 2025 Staff (Guide: Slovakia) |
| Louise | Bernier | 2023: Luxembourg (Contestant 1), 2025: Luxembourg (Deputy Leader) |
| Olga | Bershteyn | 2021: Denmark (Deputy Leader) |
| Federica | Bertolotti | 2018: EGMO 2018 Staff (Guide: Bosnia and Herzegovina, India) |
| Admir | Beširević | 2017: Bosnia and Herzegovina (Deputy Leader), 2022: Bosnia and Herzegovina (Leader), 2023: Bosnia and Herzegovina (Deputy Leader) |
| Olga | Besova | 2024: Israel (Contestant 2: Bronze Medal), 2025: Israel (Contestant 2: Gold Medal) |
| Pauline | Bessemans | 2014: Belgium (Contestant 1), 2015: Belgium (Contestant 1), 2016: Belgium (Contestant 1) |
| Alexander | Betts | 2012: EGMO 2012 Staff (Coordinator) |
| Maria | Bevilacqua | 2018: Italy (Contestant 2: Bronze Medal) |
| Ankan | Bhattacharya | 2025: EGMO 2025 Staff (Problem Selection) |
| Andrea | Bianchi | 2018: EGMO 2018 Staff (Coordinator) |
| Claudio Filippo | Bianchi | 2018: EGMO 2018 Staff (Coordinator) |
| Luigi Amedeo | Bianchi | 2018: EGMO 2018 Staff (Staff) |
| Anna | Bicevska | 2013: Latvia (Contestant 1) |
| Luiza Akemi | Bidoia de Freitas | 2024: Brazil (Contestant 3: Bronze Medal) |
| Kerrin | Bielser | 2018: Germany (Contestant 1: Bronze Medal), 2025: Germany (Deputy Leader) |
| Mariana | Bigolin Groff | 2017: Brazil (Contestant 3: Bronze Medal), 2018: Brazil (Contestant 3: Silver Medal), 2019: Brazil (Contestant 1: Gold Medal) |
| Driton | Bilalli | 2025: EGMO 2025 Staff (Deputy Chief Guide) |
| Louise | Bilston | 2019: Australia (Observer with Contestants), 2023: Australia (Observer with Contestants) |
| Margaret | Bilu | 2013: France (Leader), 2014: France (Leader), 2015: France (Leader) |
| Olesia | Bilyk | 2019: Ukraine (Contestant 1: Bronze Medal) |
| Rayan | Bintay Mostafa | 2021: Bangladesh (Contestant 3: Bronze Medal), 2022: Bangladesh (Contestant 2: Bronze Medal) |
| Claudia | Birrer | 2017: EGMO 2017 Staff (Invigilator) |
| Sasha | Biryukov | 2020: Luxembourg (Contestant 1), 2021: Luxembourg (Contestant 1) |
| Aurora Sletnes | Bjørlo | 2017: Norway (Contestant 2) |
| Romelda | Blacëri | 2017: Albania (Contestant 3: Honourable Mention) |
| Ita | Blašković | 2025: Croatia (Contestant 1: Honourable Mention) |
| Hanna | Blazhko | 2019: Belarus (Contestant 4: Bronze Medal), 2021: Belarus (Contestant 3) |
| Dorinel-Ionuţ | Bobîrnac | 2016: EGMO 2016 Staff (Guide: Ireland) |
| Iryna | Bobkova | 2019: EGMO 2019 Staff (Guide: India) |
| Esther | Bod | 2017: EGMO 2017 Staff (Coordinator), 2020: EGMO 2020 Staff (Organiser) |
| Máté | Bodnár | 2022: EGMO 2022 Staff (Guide: Finland) |
| Sjoerd | Boersma | 2020: EGMO 2020 Staff (Organiser) |
| Irina | Bogacheva | 2015: EGMO 2015 Staff (Chief Invigilator) |
| Ana-Maria-Iulia | Bogdan | 2021: Romania (Contestant 4: Bronze Medal) |
| Ekaterina | Bogdanova | 2017: Russian Federation (Contestant 1: Silver Medal) |
| Haldis Tuva Tolås | Boge | 2018: Norway (Contestant 1) |
| Norbert | Bogya | 2022: EGMO 2022 Staff (Entertainment) |
| Ana | Boiangiu | 2023: Romania (Contestant 4: Gold Medal), 2025: Romania (Contestant 3: Silver Medal) |
| Elton | Bojaxhiu | 2017: Albania (Deputy Leader) |
| Aleksandra | Bojic | 2017: EGMO 2017 Staff (Guide: Serbia) |
| Adisa | Bolić | 2016: Bosnia and Herzegovina (Contestant 2: Gold Medal), 2017: Bosnia and Herzegovina (Contestant 2: Silver Medal), 2018: Bosnia and Herzegovina (Deputy Leader), 2019: Bosnia and Herzegovina (Leader), 2020: Bosnia and Herzegovina (Leader), 2021: Bosnia and Herzegovina (Leader), 2022: Bosnia and Herzegovina (Deputy Leader), 2023: Bosnia and Herzegovina (Leader), 2025: Bosnia and Herzegovina (Leader) |
| Utkir | Boltaev | 2025: Uzbekistan (Leader) |
| Valeriia | Bondarenko | 2019: EGMO 2019 Staff (Guide: Bosnia and Herzegovina) |
| Dace | Bonka | 2012: Latvia (Deputy Leader) |
| Sanika | Borade | 2022: India (Contestant 4: Bronze Medal) |
| Márton | Borbényi | 2022: EGMO 2022 Staff (Problem Selection, Coordinator) |
| Ema | Borevković | 2020: Croatia (Contestant 1: Bronze Medal), 2021: Croatia (Contestant 1: Silver Medal) |
| Ana Karoline | Borges Carneiro | 2017: Brazil (Deputy Leader), 2020: Brazil (Leader) |
| Veronika | Borková | 2022: Czechia (Contestant 2: Bronze Medal) |
| Maria Adela | Borlan | 2016: EGMO 2016 Staff (Invigilator) |
| Marius | Borlan | 2016: EGMO 2016 Staff (Guide: Latvia) |
| Sviatoslav | Borodachev | 2015: EGMO 2015 Staff (Coordinator) |
| Yulia | Borodun | 2015: EGMO 2015 Staff (Organization Committee) |
| Tetiana | Borovska | 2019: EGMO 2019 Staff (Guide: Belgium) |
| Gabriela | Bortolini | 2016: EGMO 2016 Staff (Guide: Israel) |
| Wladimir-Georges | Boskoff | 2016: EGMO 2016 Staff (Coordinator) |
| Hannah | Boß | 2019: Germany (Contestant 1: Bronze Medal) |
| Patrícia Izabella | Bostan | 2022: EGMO 2022 Staff (Guide: Netherlands) |
| Zsuzsanna | Bősze | 2012: Hungary (Contestant 3), 2013: Hungary (Contestant 2: Bronze Medal) |
| Raul Constantin | Boteanu | 2016: EGMO 2016 Staff (Guide: Cyprus) |
| Carina | Both | 2012: Netherlands (Contestant 2) |
| Martin | Bottesch | 2016: EGMO 2016 Staff (Coordinator) |
| Sabrina | Botticchio | 2018: Italy B (Contestant 1: Honourable Mention), 2019: Italy (Contestant 2: Bronze Medal), 2020: Italy (Contestant 1: Silver Medal), 2024: Italy (Observer with Leader) |
| Fowzia | Boukari | 2015: Saudi Arabia (Observer with Contestants) |
| Ahmed | Bouri | 2018: EGMO 2018 Staff (Guide: Saudi Arabia) |
| Marina | Boyadzhieva | 2019: Bulgaria (Contestant 3: Silver Medal) |
| Peter | Boyvalenkov | 2020: Bulgaria (Observer with Leader) |
| Ramilya | Bozova | 2025: Kyrgyzstan (Contestant 3: Honourable Mention) |
| Łukasz | Bożyk | 2020: Poland (Deputy Leader) |
| Jagoda | Bracha | 2019: Poland (Contestant 1: Silver Medal) |
| Carmen | Brannath | 2018: Germany (Contestant 4) |
| Damjan | Bratkovič | 2023: EGMO 2023 Staff (Staff) |
| Laëtitia | Braucourt | 2019: Luxembourg (Contestant 1), 2020: Luxembourg (Contestant 2) |
| Eva | Brazevica | 2013: Latvia (Contestant 2: Honourable Mention) |
| Silouanos | Brazitikos | 2022: Greece (Observer with Leader) |
| Anastasia | Bredichina | 2022: Czechia (Contestant 1), 2023: Czechia (Contestant 1: Bronze Medal), 2024: Czechia (Contestant 1: Bronze Medal) |
| Sopio | Bregadze | 2016: Georgia (Contestant 3: Bronze Medal), 2017: Georgia (Contestant 2: Bronze Medal) |
| Maryia | Brel | 2022: Belarus (Contestant 4: Bronze Medal) |
| Viktória | Brezinová | 2019: Slovakia (Contestant 1: Honourable Mention) |
| Gabriela | Brie | 2016: EGMO 2016 Staff (Invigilator) |
| Farah | Briki | 2017: Tunisia (Contestant 2: Honourable Mention), 2018: Tunisia (Contestant 1: Bronze Medal) |
| Karen | Briscoe | 2013: Ireland (Contestant 1: Honourable Mention), 2014: Ireland (Contestant 1) |
| Nishat Anjum | Bristy | 2021: Bangladesh (Observer with Leader), 2022: Bangladesh (Observer with Leader) |
| Niamh | Broderick | 2012: Ireland (Contestant 1) |
| Slagjana | Brsakoska | 2015: The former Yugoslav Republic of Macedonia (Deputy Leader), 2016: The former Yugoslav Republic of Macedonia (Deputy Leader), 2017: The former Yugoslav Republic of Macedonia (Deputy Leader), 2018: The former Yugoslav Republic of Macedonia (Leader), 2019: North Macedonia (Leader) |
| Melisa | Brulić | 2023: EGMO 2023 Staff (Guide: North Macedonia) |
| Rok Tadej | Brunšek | 2023: EGMO 2023 Staff (Guide: Switzerland) |
| Hassan | Bu ali | 2023: Saudi Arabia (Observer with Contestants), 2024: Saudi Arabia (Observer with Contestants), 2025: Saudi Arabia (Observer with Contestants) |
| Fatimah | Buali | 2023: Saudi Arabia (Contestant 4: Honourable Mention), 2024: Saudi Arabia (Contestant 1: Bronze Medal), 2025: Saudi Arabia (Contestant 1: Silver Medal) |
| Anna | Buchmann | 2017: EGMO 2017 Staff (Coordinator) |
| Mihai-Alexandru | Bucur | 2016: EGMO 2016 Staff (Guide: Switzerland) |
| Sorin | Bucur | 2016: EGMO 2016 Staff (Staff) |
| Viorel-Andrei | Bud | 2016: EGMO 2016 Staff (Coordinator) |
| Ajsel | Budlla | 2024: Albania (Contestant 4) |
| Katarzyna | Budzik | 2014: Poland (Contestant 1) |
| Hoang-Phung | Bui | 2013: EGMO 2013 Staff (Coordinator) |
| Elisabeth | Buj Reitze | 2018: EGMO 2018 Staff (Guide: Spain) |
| Teodora | Bujaroska | 2015: The former Yugoslav Republic of Macedonia (Contestant 3: Bronze Medal) |
| Natalia | Bukowska | 2018: EGMO 2018 Staff (Guide: Poland) |
| Radmila | Bulajich | 2014: Mexico (Deputy Leader) |
| Uela | Bunjaku | 2025: EGMO 2025 Staff (Guide: Cyprus) |
| Iryna | Burak | 2013: Belarus (Contestant 1: Bronze Medal), 2014: Belarus (Contestant 1: Bronze Medal), 2015: EGMO 2015 Staff (Coordinator), 2017: EGMO 2017 Staff (Coordinator), 2019: Belarus (Deputy Leader), 2020: EGMO 2020 Staff (Coordinator), 2025: EGMO 2025 Staff (Coordinator) |
| Manuela | Burchiu | 2016: EGMO 2016 Staff (Staff) |
| Anisa | Burieva | 2021: Tajikistan (Contestant 2: Honourable Mention), 2022: Tajikistan (Contestant 4: Honourable Mention), 2023: Tajikistan (Contestant 1: Bronze Medal) |
| Laura | Buruiana | 2016: EGMO 2016 Staff (Staff) |
| Francesca | Busato | 2021: Italy (Contestant 1), 2022: Italy (Contestant 1: Bronze Medal) |
| Valerie Denisse | Bustos | 2016: Ecuador (Contestant 2), 2017: Ecuador (Contestant 1: Honourable Mention), 2018: Ecuador (Contestant 3: Honourable Mention) |
| Mariam | Butskhrikidze | 2024: EGMO 2024 Staff (Guide: Kosovo) |
| Cemre | Çadır | 2016: Türkiye (Contestant 1: Bronze Medal) |
| Aline | Cahuzac | 2017: France (Contestant 1: Gold Medal), 2021: France (Leader), 2023: France (Deputy Leader), 2025: France (Leader) |
| Linshan | Cai | 2024: People's Republic of China (Contestant 1: Silver Medal) |
| Melissa | Cai Shi | 2017: Costa Rica (Contestant 1) |
| Joanna | Caisová | 2012: United Kingdom (Deputy Leader), 2013: United Kingdom (Deputy Leader), 2014: United Kingdom (Deputy Leader), 2015: United Kingdom (Leader), 2016: United Kingdom (Leader), 2017: United Kingdom (Leader), 2018: United Kingdom (Leader) |
| Melike | Çakan | 2014: EGMO 2014 Staff (Guide, TÜBİTAK) |
| Pavel | Calábek | 2019: Czechia (Deputy Leader), 2020: Czechia (Deputy Leader), 2024: Czechia (Leader) |
| Sabrina | Calcina | 2023: EGMO 2023 Staff (Guide) |
| Elçin | Çalışkan | 2022: Türkiye (Observer with Leader) |
| Emanuele | Callegari | 2018: EGMO 2018 Staff (Staff) |
| Isabelle | Calvé | 2017: EGMO 2017 Staff (Guide: Belgium, France) |
| Giovanni | Calza | 2018: EGMO 2018 Staff (Guide: Ecuador) |
| María Roberta | Camacho Vaca | 2022: Ecuador (Contestant 4) |
| Neca | Camlek | 2022: Slovenia (Contestant 1), 2023: Slovenia B (Contestant 3: Honourable Mention), 2024: EGMO 2024 Staff (Coordinator) |
| Sandro | Campigotto | 2018: EGMO 2018 Staff (Staff) |
| Daniel | Campos Salas | 2020: Costa Rica (Leader), 2021: Costa Rica (Leader), 2022: Costa Rica (Leader) |
| Marta | Cano Cagigas | 2022: Spain (Contestant 2: Bronze Medal) |
| Rosa Victoria | Cantú Rodríguez | 2022: Mexico (Contestant 4: Bronze Medal), 2023: Mexico (Contestant 2: Silver Medal), 2024: Mexico (Contestant 2: Bronze Medal) |
| Anne | Cao | 2022: Belgium (Contestant 1) |
| Dariam | Caparachin | 2021: Peru (Contestant 2: Gold Medal), 2022: Peru (Contestant 3: Gold Medal) |
| Luana | Capus | 2016: Luxembourg (Contestant 1), 2017: Luxembourg (Contestant 1) |
| Alessandra | Caraceni | 2012: Italy (Deputy Leader), 2013: Italy (Deputy Leader), 2014: Italy (Leader), 2015: Italy (Leader), 2016: Italy (Leader), 2017: Italy (Leader, EGMO AB), 2018: EGMO 2018 Staff (Chief Coordinator, EGMO AB), 2019: EGMO 2019 Staff (EGMO AB, Coordinator), 2020: EGMO 2020 Staff (Coordinator, Problem Selection), 2022: EGMO 2022 Staff (Coordinator) |
| Ana | Caraiani | 2016: EGMO 2016 Staff (Guest Speaker) |
| Dan | Carmon | 2016: Israel (Leader), 2017: Israel (Leader), 2018: Israel (Leader), 2019: Israel (Leader), 2020: Israel (Leader), 2021: Israel (Leader), 2022: Israel (Leader), 2023: Israel (Leader), 2024: EGMO 2024 Staff (Problem Selection, Coordinator), 2025: EGMO 2025 Staff (Problem Selection, Coordinator) |
| Florina Tatiana | Cârstea | 2016: EGMO 2016 Staff (Guide: Japan) |
| Valeria | Cartagena | 2022: Bolivia (Contestant 1: Honourable Mention) |
| Noémie | Cartier | 2013: France (Contestant 1: Honourable Mention), 2016: France (Deputy Leader), 2017: France (Deputy Leader), 2018: France (Deputy Leader), 2019: France (Leader) |
| Silvia | Casacuberta Puig | 2017: Spain (Contestant 1), 2018: Spain (Contestant 1: Honourable Mention) |
| Camilla | Casamento Tumeo | 2014: Italy (Contestant 2: Bronze Medal), 2015: Italy (Contestant 1: Bronze Medal) |
| Soline | Casavecchia | 2018: Belgium (Contestant 1: Honourable Mention) |
| Andrea Sarahí | Cascante Duarte | 2023: Mexico (Contestant 1: Honourable Mention), 2024: Mexico (Contestant 1: Bronze Medal), 2025: Mexico (Contestant 1: Bronze Medal) |
| Diana | Castañeda Santos | 2020: Canada (Deputy Leader), 2022: Canada (Deputy Leader) |
| Olivia | Castleden | 2025: South Africa (Contestant 4) |
| Silvian | Cata | 2016: EGMO 2016 Staff (Guide) |
| Rosie | Cates | 2015: United Kingdom (Contestant 2: Bronze Medal), 2016: United Kingdom (Contestant 1: Gold Medal), 2017: United Kingdom (Contestant 1: Gold Medal) |
| Asja | Ćatić | 2021: Bosnia and Herzegovina (Contestant 4: Bronze Medal), 2023: Bosnia and Herzegovina (Contestant 2: Silver Medal), 2024: Bosnia and Herzegovina (Contestant 1: Silver Medal) |
| Hana | Ćatić | 2020: Bosnia and Herzegovina (Contestant 4) |
| Barbara | Catino | 2024: Italy (Contestant 1: Silver Medal), 2025: Italy (Contestant 1: Gold Medal) |
| Federica | Cecchetto | 2012: Italy (Contestant 1: Bronze Medal), 2014: Italy (Contestant 3: Silver Medal), 2018: EGMO 2018 Staff (Coordinator) |
| Florion | Çela | 2019: Albania (Deputy Leader) |
| Lyron | Celina | 2025: EGMO 2025 Staff (Guide: North Macedonia) |
| Ilma | Čeljo | 2022: Bosnia and Herzegovina (Contestant 4: Bronze Medal), 2023: Bosnia and Herzegovina (Contestant 3: Bronze Medal), 2024: Bosnia and Herzegovina (Contestant 3: Honourable Mention) |
| Lea | Centrih | 2023: EGMO 2023 Staff (Guide: Ireland) |
| Tereza | Černá | 2022: Czechia (Contestant 3: Bronze Medal), 2023: Czechia (Contestant 2: Silver Medal), 2024: Czechia (Contestant 2: Silver Medal) |
| Cemre | Çetin | 2022: Türkiye (Contestant 2: Bronze Medal) |
| İrem Nur | Çevikcan | 2018: Türkiye (Contestant 1: Bronze Medal), 2019: Türkiye (Contestant 1: Bronze Medal) |
| Litsa | Ceyssens | 2025: Belgium (Contestant 1) |
| Nino | Chachanidze | 2024: Georgia B (Contestant 2) |
| Sanjana | Chacko | 2023: India (Contestant 3: Bronze Medal), 2024: India (Contestant 4: Silver Medal), 2025: India (Contestant 1: Silver Medal) |
| Horace | Chaix | 2017: Switzerland (Leader) |
| Sanae | Chakroune | 2023: Belgium (Contestant 1: Honourable Mention) |
| Siarhei | Charnou | 2015: Belarus (Deputy Leader) |
| Raka | Chattopadhyay | 2022: United Kingdom (Contestant 3: Bronze Medal) |
| Hou Tin | Chau | 2025: EGMO 2025 Staff (Coordinator) |
| Jazmin | Chavarri | 2022: Peru (Contestant 4: Silver Medal) |
| Ana Paula | Chaves | 2022: Brazil (Leader), 2023: Brazil (Leader) |
| Emmanuel | Chaves Villalobos | 2017: Costa Rica (Leader) |
| Solomia | Chayka | 2019: EGMO 2019 Staff (Guide: Finland) |
| Kesaria | Chelidze | 2021: Georgia (Contestant 1), 2022: Georgia (Contestant 4: Bronze Medal), 2023: Georgia (Contestant 2: Bronze Medal) |
| Alice | Chen | 2024: Taiwan (Contestant 1: Gold Medal), 2025: Taiwan (Contestant 1: Gold Medal) |
| Cangxiong | Chen | 2012: EGMO 2012 Staff (Invigilator) |
| Dora | Chen | 2020: Belgium (Contestant 1: Bronze Medal), 2021: Belgium (Contestant 1: Silver Medal), 2022: Belgium (Contestant 2: Silver Medal) |
| Jacopo | Chen | 2018: EGMO 2018 Staff (Coordinator) |
| Michelle | Chen | 2018: Australia (Deputy Leader), 2019: Australia (Deputy Leader), 2020: Australia (Deputy Leader), 2021: Australia (Deputy Leader), 2025: Australia (Leader) |
| Qiaojia | Chen | 2025: New Zealand (Contestant 1) |
| Qingyi | Chen | 2023: Ireland (Contestant 3), 2024: Ireland (Contestant 1) |
| Ruishan | Chen | 2025: New Zealand (Contestant 2: Honourable Mention) |
| Thomas | Chen | 2020: EGMO 2020 Staff (Organiser) |
| Tien-sheng | Cheng | 2025: Taiwan (Observer with Leader) |
| Noelia | Cheridito | 2024: Switzerland (Contestant 4: Bronze Medal) |
| Sergei | Cherkasov | 2015: EGMO 2015 Staff (IT) |
| Victoria | Cherniak | 2019: EGMO 2019 Staff (Guide: Greece) |
| Palina | Chernikava | 2019: Belarus (Contestant 2: Silver Medal), 2020: Belarus (Contestant 2: Gold Medal), 2022: Belarus (Deputy Leader), 2023: Belarus (Deputy Leader) |
| Taisiya | Chernova | 2024: Cyprus (Contestant 4: Bronze Medal) |
| Darya | Chernyakovskaya | 2015: EGMO 2015 Staff (Guide) |
| Francesca | Chiappini | 2018: EGMO 2018 Staff (Staff) |
| Georgios | Chimonides | 2024: Cyprus (Leader) |
| Doina | Chiroiu | 2016: Romania B (Contestant 3: Silver Medal) |
| Mihai | Chiş | 2016: EGMO 2016 Staff (Coordinator) |
| Qin-rou | Chiu | 2025: Taiwan (Contestant 4: Silver Medal) |
| Ekaterina | Chizhova | 2023: Slovenia B (Contestant 1), 2024: Slovenia (Contestant 2: Silver Medal), 2025: Slovenia (Contestant 1: Silver Medal) |
| Nino | Chkhaidze | 2023: Georgia (Contestant 3: Honourable Mention), 2024: Georgia (Contestant 4: Honourable Mention) |
| Lucia | Chladná | 2022: Slovakia (Contestant 3: Bronze Medal), 2023: Slovakia (Contestant 2: Bronze Medal), 2024: Slovakia (Contestant 2: Silver Medal), 2025: Slovakia (Contestant 1: Silver Medal) |
| Andrea | Chlebikova | 2012: EGMO 2012 Staff (Guide: Bulgaria, Switzerland) |
| Eunsu | Choi | 2022: Australia (Contestant 1: Gold Medal), 2023: Australia (Contestant 1: Silver Medal) |
| Yunseo | Choi | 2021: United States of America (Contestant 2: Gold Medal) |
| Mari | Chokhonelidze | 2024: EGMO 2024 Staff (Guide: Brazil) |
| Maleque | Chouayekh | 2022: Tunisia (Contestant 2: Honourable Mention) |
| Maya | Chouikrat | 2024: Algeria (Observer with Leader) |
| Veronika | Chovancová | 2023: Slovakia (Contestant 3: Bronze Medal) |
| Ahmed Zawad | Chowdhury | 2021: Bangladesh (Deputy Leader) |
| Atonu Roy | Chowdhury | 2024: Bangladesh (Leader), 2025: Bangladesh (Leader) |
| Demetres | Christofides | 2019: Cyprus (Leader), 2020: Cyprus (Leader), 2021: Cyprus (Leader), 2022: Cyprus (Leader) |
| Tatsiana | Chubarava | 2015: EGMO 2015 Staff (Guide: Luxembourg, Netherlands) |
| Daria | Chumachenko | 2019: EGMO 2019 Staff (Chief Guide) |
| Vitalina | Chuprina | 2015: EGMO 2015 Staff (Guide: Finland) |
| Hanna | Churauskaya | 2015: EGMO 2015 Staff (Guide: Poland) |
| Tomasz | Cieśla | 2017: Poland (Leader), 2018: Poland (Leader) |
| Sandra | Cigula | 2023: EGMO 2023 Staff (Staff) |
| Sanda-Maria | Ciobanu | 2018: Republic of Moldova (Contestant 4) |
| Teodor | Ciobanu | 2016: EGMO 2016 Staff (Guide: Finland, Luxembourg) |
| Georgeta | Cioboată | 2016: EGMO 2016 Staff (Invigilator) |
| Eduard | Ciolompea | 2016: EGMO 2016 Staff (Guide: Serbia) |
| Mihai | Cipu | 2016: EGMO 2016 Staff (Coordinator) |
| Ana-Gabriela | Cirjea | 2024: Romania (Contestant 4: Silver Medal) |
| Marko | Ćitić | 2017: Bosnia and Herzegovina (Leader), 2018: Bosnia and Herzegovina (Leader), 2019: Bosnia and Herzegovina (Deputy Leader) |
| Marko | Čmrlec | 2023: EGMO 2023 Staff (Coordinator) |
| Ioan | Cobzaru | 2015: Romania (Observer with Deputy) |
| Raluca | Cobzaru | 2015: Romania (Contestant 4: Bronze Medal), 2016: Romania (Contestant 4: Silver Medal) |
| Isabel | Coelho | 2013: EGMO 2013 Staff (Coordinator) |
| Philip | Coggins | 2012: EGMO 2012 Staff (Invigilator) |
| Maya | Cohen | 2025: Israel (Contestant 4: Honourable Mention) |
| Stella | Čolo | 2021: Croatia (Contestant 2: Bronze Medal), 2022: Croatia (Contestant 1: Silver Medal), 2023: Croatia (Contestant 2: Gold Medal) |
| Iulian Alexandru | Coman | 2016: EGMO 2016 Staff (Guide: Georgia) |
| Giulia | Comini | 2024: Italy (Contestant 2: Bronze Medal), 2025: Italy (Contestant 2: Gold Medal) |
| Carlotta | Conermann | 2017: EGMO 2017 Staff (Staff) |
| Alice | Contat | 2013: France (Contestant 2: Honourable Mention) |
| Kieran | Cooney | 2015: Ireland (Deputy Leader), 2016: Ireland (Leader), 2020: Ireland (Deputy Leader) |
| Camille | Coppieters | 2020: Belgium (Contestant 2), 2021: Belgium (Contestant 2) |
| Sonia | Cordero | 2021: Bolivia (Deputy Leader), 2022: Bolivia (Leader) |
| Giulia | Cornali | 2015: Italy (Contestant 2: Bronze Medal), 2017: EGMO 2017 Staff (Staff) |
| Kellem | Corrêa Santos | 2020: Brazil (Deputy Leader) |
| Anastasia | Corsac | 2024: Republic of Moldova (Contestant 1: Bronze Medal), 2025: Republic of Moldova (Contestant 2: Bronze Medal) |
| Alice | Cortinovis | 2012: Italy (Contestant 2: Silver Medal), 2013: Italy (Contestant 2: Bronze Medal), 2017: Italy (Deputy Leader), 2018: Italy (Leader) |
| Laura | Cosgrave | 2018: Ireland (Contestant 3), 2019: Ireland (Contestant 2: Honourable Mention), 2020: Ireland (Contestant 1: Honourable Mention) |
| Nazlı Melis | Coşkun | 2014: EGMO 2014 Staff (Guide, Chief Guide, TÜBİTAK) |
| Luminiţa | Costache | 2016: EGMO 2016 Staff (Staff) |
| Ana | Costaș | 2021: Republic of Moldova (Deputy Leader) |
| Leonard | Coţac | 2016: EGMO 2016 Staff (Staff) |
| James | Cranch | 2012: EGMO 2012 Staff (Coordinator) |
| Dan | Crisan | 2012: EGMO 2012 Staff (Coordinator) |
| Dorian | Croitoru | 2024: Republic of Moldova (Deputy Leader) |
| Marcela | Cruz Larios | 2016: Mexico (Contestant 3), 2017: Mexico (Contestant 2: Bronze Medal), 2018: Mexico (Contestant 3: Silver Medal), 2020: Mexico (Deputy Leader), 2021: Mexico (Deputy Leader) |
| Lili Róza | Csada | 2022: EGMO 2022 Staff (Guide: Türkiye) |
| Timea | Csahók | 2022: EGMO 2022 Staff (Coordinator), 2023: EGMO 2023 Staff (Coordinator), 2024: EGMO 2024 Staff (Coordinator), 2025: EGMO 2025 Staff (Coordinator) |
| Hajnalka | Csapó | 2012: Romania (Deputy Leader), 2013: Romania (Deputy Leader), 2014: Romania (Deputy Leader), 2015: Romania (Deputy Leader), 2016: Romania (Leader), 2017: Romania (Deputy Leader), 2022: EGMO 2022 Staff (Problem Selection, Coordinator), 2023: EGMO 2023 Staff (Coordinator) |
| Jana | Cslovjecsek | 2012: Switzerland (Contestant 4), 2013: Switzerland (Contestant 1: Honourable Mention), 2017: EGMO 2017 Staff (Chief Guide, Organizing Committee, Treasurer), 2023: EGMO 2023 Staff (Coordinator) |
| Sue | Cubbon | 2012: EGMO 2012 Staff (Invigilator) |
| Paolo | Cuellar | 2016: Ecuador (Deputy Leader) |
| Ana Camila | Cuevas González | 2023: Mexico (Contestant 3) |
| Sonja | Čukić | 2017: Serbia (Deputy Leader), 2018: Serbia (Deputy Leader), 2019: Serbia (Deputy Leader), 2020: Serbia (Deputy Leader), 2021: Serbia (Deputy Leader), 2022: Serbia (Deputy Leader) |
| David-Alin | Curcan | 2016: EGMO 2016 Staff (Guide) |
| Lenca-Iarina | Cuturela | 2016: Romania B (Contestant 2: Silver Medal), 2017: Romania (Contestant 2: Silver Medal), 2018: Romania (Contestant 2: Gold Medal) |
| Ştefana | Cuzuioc | 2016: EGMO 2016 Staff (Guide: Albania) |
| Maja | Cvetković | 2019: Serbia (Contestant 4: Bronze Medal) |
| Edwige | Cyffers | 2014: France (Contestant 1), 2020: France (Deputy Leader), 2025: EGMO 2025 Staff (EGMO Board) |
| Aleksandra | Cynk | 2017: Poland (Contestant 1: Silver Medal), 2018: Poland (Contestant 1: Silver Medal) |
| Anna | Czerwińska | 2013: Poland (Contestant 1: Bronze Medal), 2015: Poland (Contestant 1: Bronze Medal) |
| Wojciech | Czerwiński | 2014: Poland (Leader) |
| Lilla | Czinege | 2022: EGMO 2022 Staff (Guide: Hungary) |
| Jadwiga | Czyżewska | 2018: Poland (Contestant 2: Bronze Medal) |
| Belinda | D'Hamers | 2017: Luxembourg (Contestant 2) |
| Luíze | D’Urso | 2018: Brazil (Deputy Leader), 2019: Brazil (Deputy Leader), 2021: Brazil (Leader) |
| Sirio | Dafa | 2025: Albania (Observer with Leader) |
| Ghadeer | Daghistani | 2018: Saudi Arabia (Contestant 4), 2019: Saudi Arabia (Contestant 2: Silver Medal) |
| Monia | Daghmouri Ep Bouzouita | 2017: Tunisia (Deputy Leader), 2018: Tunisia (Deputy Leader) |
| Lucija | Dajčman | 2023: EGMO 2023 Staff (Guide: Israel) |
| Lucija | Dalbina | 2017: Latvia (Contestant 4) |
| Gabriele | Dalla Torre | 2018: EGMO 2018 Staff (Problem Selection) |
| Alesya | Damchenko | 2015: EGMO 2015 Staff (Guide: Japan) |
| Alexandra | Dan | 2016: EGMO 2016 Staff (Guide) |
| Cezara | Danciu | 2022: Romania (Contestant 4: Silver Medal) |
| Irina | Đanković | 2017: Serbia (Contestant 4: Silver Medal), 2018: Serbia (Contestant 2: Bronze Medal), 2020: Serbia (Contestant 2: Gold Medal) |
| Katarina | Darrosa | 2013: EGMO 2013 Staff (Guide: Bulgaria, Serbia, Türkiye) |
| Haimoshri | Das | 2016: India (Contestant 1), 2017: India (Contestant 1: Honourable Mention), 2018: India (Contestant 1: Bronze Medal) |
| Sanjana | Das | 2020: United States of America (Contestant 1: Gold Medal), 2021: United States of America (Contestant 3: Gold Medal) |
| Oleksandr | Dashkov | 2019: EGMO 2019 Staff (Coordinator), 2024: EGMO 2024 Staff (Coordinator) |
| Lizaveta | Dauhiala | 2013: Belarus (Contestant 2: Gold Medal) |
| Victoriia | Davydova | 2021: Kyrgyzstan (Contestant 4) |
| Archi | De | 2017: India (Contestant 2: Bronze Medal) |
| Prithwijit | De | 2018: India (Leader), 2020: India (Leader) |
| Madeleine | de Belloy de Saint Liénard | 2023: France (Contestant 1: Bronze Medal) |
| Cara | de Bruyn | 2021: Germany (Contestant 1: Silver Medal) |
| Saar | De Bus | 2023: Belgium (Contestant 2), 2024: Belgium (Contestant 1) |
| Ambre | De Herde | 2016: Belgium (Contestant 2), 2017: Belgium (Contestant 1) |
| Lucero Andrea | De La Torre Ugarte Diaz De Oropeza | 2018: Bolivia (Contestant 4) |
| Maria Clara | de Lacerda Werneck | 2019: Brazil (Contestant 4: Bronze Medal), 2020: Brazil (Contestant 4: Silver Medal), 2022: Brazil (Deputy Leader), 2023: Brazil (Deputy Leader), 2024: Brazil (Leader) |
| Esterina | De Pascalis | 2017: EGMO 2017 Staff (Logistics) |
| Wietske | de Vos | 2022: Netherlands (Contestant 3) |
| Ramona | Deaconu | 2016: Romania (Contestant 3: Bronze Medal), 2017: Romania (Contestant 3: Bronze Medal) |
| Hejli | Dedja | 2023: Albania (Contestant 2), 2024: Albania (Contestant 3) |
| Itgel | Delgerdalai | 2018: Mongolia (Contestant 4: Bronze Medal) |
| Morine | Delhelle | 2014: Belgium (Contestant 2), 2015: Belgium (Contestant 2: Honourable Mention) |
| Elise | Delhez | 2012: Belgium (Contestant 1), 2013: Belgium (Contestant 1: Honourable Mention) |
| Ippolyti | Dellatolas | 2013: France (Contestant 3: Honourable Mention), 2016: France (Leader), 2017: France (Leader), 2018: France (Leader) |
| Claire | Deloye | 2024: France (Contestant 1) |
| Louise | Deloye | 2025: France (Contestant 1: Bronze Medal) |
| Mariya | Delyakova | 2016: Bulgaria (Contestant 4: Silver Medal) |
| Khuslen | Dembereldorj | 2018: Mongolia (Observer with Contestants) |
| Julian | Demeio | 2018: EGMO 2018 Staff (Staff) |
| Terpsa | Demetriou Karantanou | 2023: Cyprus (Deputy Leader) |
| Bengisu | Demirbaş | 2024: Türkiye (Contestant 2: Silver Medal), 2025: Türkiye (Contestant 1: Silver Medal) |
| Murat | Demirbüken | 2014: EGMO 2014 Staff (IT) |
| Yunus Emre | Demirci | 2014: EGMO 2014 Staff (Academic assistant) |
| Farah | Demirović | 2025: Bosnia and Herzegovina (Contestant 3: Bronze Medal) |
| Erlisa | Demneri | 2022: Albania (Contestant 3) |
| Benedetta | Demoro | 2023: Italy (Contestant 1) |
| Andrei | Demyanovich | 2015: EGMO 2015 Staff (Organization Committee) |
| Angela | Deng | 2017: United States of America (Contestant 1: Gold Medal) |
| Nikita | Deniskin | 2018: EGMO 2018 Staff (Coordinator) |
| Jelizaveta | Deņisova | 2025: Latvia (Contestant 3) |
| Martine | Deprez | 2013: EGMO 2013 Staff (Local Organization Committee Chair, Invigilator) |
| Fiona | Dërmaku | 2025: EGMO 2025 Staff (Chief Guide) |
| Lum | Dërmaku | 2025: EGMO 2025 Staff (Chief Invigilator) |
| Amir | Dervishi | 2025: EGMO 2025 Staff (Guide: Türkiye) |
| Marie | Determe | 2019: Belgium (Contestant 1: Honourable Mention), 2020: Belgium (Contestant 3: Honourable Mention), 2021: Belgium (Contestant 3: Silver Medal) |
| Beverley | Detoeuf | 2012: EGMO 2012 Staff (Staff) |
| Shpendi | Deva | 2025: EGMO 2025 Staff (Guide: Hungary) |
| Albertine | Devillers | 2015: France (Contestant 1) |
| Márk | Di Giovanni | 2022: EGMO 2022 Staff (Coordinator) |
| Simone | Di Marino | 2018: EGMO 2018 Staff (Staff) |
| Alexandru | Diaconescu | 2016: EGMO 2016 Staff (Guide) |
| Iustina | Diaconu | 2025: Romania (Contestant 2: Bronze Medal) |
| Simona | Diaconu | 2012: Romania (Contestant 1: Gold Medal), 2013: Romania (Contestant 1: Gold Medal), 2014: Romania (Contestant 1: Gold Medal), 2015: Romania (Contestant 1: Gold Medal) |
| Ana | Diakonidze | 2024: EGMO 2024 Staff (Guide: Albania) |
| Mariam | Diakonidze | 2024: EGMO 2024 Staff (Guide: Bulgaria) |
| Mencía | Diaz de Cerio Ruiz de Lobera | 2021: Spain (Contestant 3), 2022: Spain (Contestant 3: Honourable Mention) |
| Julio César | Díaz-Calderón | 2016: Mexico (Deputy Leader) |
| Anar | Didarbekova | 2025: Kazakhstan (Contestant 2: Bronze Medal) |
| Cheikh Tidiane | Diedhiou | 2014: EGMO 2014 Staff (Guide: Belgium, France) |
| Helge | Dietert | 2012: EGMO 2012 Staff (Invigilator) |
| Freek | Dijkstra | 2020: EGMO 2020 Staff (Organiser) |
| Emily | Dikhoff | 2019: Switzerland (Contestant 1), 2021: Switzerland (Contestant 2), 2022: Switzerland (Contestant 3: Bronze Medal), 2024: Switzerland (Deputy Leader), 2025: Switzerland (Leader) |
| Vachagan | Dilanyan | 2025: Armenia (Leader) |
| Andreea | Dima | 2015: Romania (Observer with Contestants), 2016: Romania (Contestant 2: Bronze Medal) |
| Clara Maria | Dima | 2016: Romania B (Contestant 1: Silver Medal) |
| Bilyana | Dimitrova | 2022: Bulgaria (Contestant 3: Gold Medal), 2023: Bulgaria (Contestant 1: Silver Medal) |
| Clara | Ding | 2014: France (Contestant 2), 2015: France (Contestant 2: Silver Medal), 2019: France (Deputy Leader), 2020: France (Leader) |
| Tina | Ding | 2023: Germany (Contestant 1: Silver Medal), 2024: Germany (Contestant 1: Silver Medal), 2025: Germany (Contestant 1: Gold Medal) |
| Amalia | Dinu | 2016: EGMO 2016 Staff (Guide: Bosnia and Herzegovina) |
| Evanthia | Diomidous | 2017: Cyprus (Contestant 4: Honourable Mention), 2018: Cyprus (Contestant 3: Honourable Mention) |
| Nujhat Ahmed | Disha | 2021: Bangladesh (Contestant 1: Silver Medal), 2022: Bangladesh (Contestant 1: Bronze Medal), 2023: Bangladesh (Contestant 1: Silver Medal), 2024: Bangladesh (Contestant 1: Bronze Medal) |
| Maria | Dmitrieva | 2016: Russian Federation (Contestant 3: Gold Medal), 2017: Russian Federation (Contestant 4: Gold Medal) |
| Tetyana | Dmytrenko | 2019: EGMO 2019 Staff (Guide: Lithuania) |
| Sándor | Dobos | 2022: EGMO 2022 Staff (Coordinator) |
| Mirela | Dobrea | 2016: EGMO 2016 Staff (Staff) |
| Maša | Dobrić | 2024: Croatia (Contestant 1: Silver Medal), 2025: Croatia (Contestant 2: Silver Medal) |
| Elif | Doğan | 2014: EGMO 2014 Staff (Academic assistant) |
| Pınar Selinay | Doğan | 2014: EGMO 2014 Staff (Guide: Türkiye, Türkiye B) |
| Serpil | Doğan | 2014: EGMO 2014 Staff (Guide: United Kingdom) |
| Aicha | Doghri | 2023: Tunisia (Contestant 2) |
| Dajana | Dokaj | 2021: Albania (Contestant 3) |
| Milica | Đokić | 2018: Bosnia and Herzegovina (Contestant 4: Bronze Medal) |
| Ana Meta | Dolinar | 2017: Slovenia (Contestant 1: Bronze Medal), 2018: Slovenia (Contestant 1: Bronze Medal), 2019: Slovenia (Contestant 1: Bronze Medal), 2020: Slovenia (Leader), 2021: Slovenia (Leader), 2022: Slovenia (Leader), 2023: EGMO 2023 Staff (Jury Chair, EGMO Board), 2024: EGMO 2024 Staff (Problem Selection, Coordinator, EGMO Board), 2025: Slovenia (Leader, EGMO Board) |
| Gregor | Dolinar | 2023: EGMO 2023 Staff (Organiser Vice Chair) |
| Lenart | Dolinar | 2024: EGMO 2024 Staff (Coordinator), 2025: EGMO 2025 Staff (Coordinator) |
| Anastasiia | Dolynets | 2019: EGMO 2019 Staff (Guide: Ecuador) |
| Alica | Dományová | 2021: Slovakia (Contestant 1: Silver Medal), 2022: Slovakia (Contestant 1: Bronze Medal), 2023: Slovakia (Contestant 1: Bronze Medal), 2024: Slovakia (Contestant 1: Bronze Medal) |
| Nikita | Domenikan | 2015: EGMO 2015 Staff (Guide: India, Tunisia) |
| Yves | Dominicy | 2013: EGMO 2013 Staff (Coordinator) |
| Ciril | Dominko | 2023: EGMO 2023 Staff (Treasurer) |
| Otilia | Don | 2016: Republic of Moldova (Contestant 2: Silver Medal), 2017: Republic of Moldova (Contestant 1: Bronze Medal), 2018: Republic of Moldova (Contestant 1: Silver Medal) |
| CJ | Donnelly | 2012: EGMO 2012 Staff (Invigilator) |
| Michiel | Doorman | 2020: EGMO 2020 Staff (Organiser) |
| Adelina | Dorovska | 2025: Bulgaria (Contestant 3: Silver Medal) |
| Mike | Dostert | 2012: Luxembourg (Deputy Leader), 2013: EGMO 2013 Staff (Managing Director, IT, Local Organization Committee), 2023: Luxembourg (Deputy Leader), 2025: Luxembourg (Leader) |
| Kathryn | Dou | 2022: Canada (Contestant 3: Silver Medal), 2023: Canada (Contestant 1: Silver Medal), 2024: Canada (Deputy Leader) |
| Boris | Doubrov | 2015: EGMO 2015 Staff (Coordinator) |
| Meriem Nour El Yakine | Doum | 2024: Algeria (Contestant 4: Honourable Mention) |
| Luciano | Drăguşi | 2016: EGMO 2016 Staff (Guide: Romania, Romania B) |
| Delia | Drăguşin | 2016: EGMO 2016 Staff (Guide: Saudi Arabia) |
| Sara | Dragutinović | 2021: Serbia (Contestant 2: Bronze Medal) |
| Yani | Drenchev | 2022: Bulgaria (Deputy Leader), 2023: Bulgaria (Deputy Leader) |
| Maria | Drencheva | 2021: Bulgaria (Contestant 2: Bronze Medal), 2023: Bulgaria (Contestant 2: Gold Medal) |
| Alice | Drera | 2023: Italy (Contestant 2: Honourable Mention) |
| Alketa | Dreshaj | 2023: Kosovo (Contestant 3), 2025: EGMO 2025 Staff (Guide: Saudi Arabia) |
| Heather | Drewett | 2013: EGMO 2013 Staff (Chief Guide) |
| Suzanne | Driscoll Plump | 2016: EGMO 2016 Staff (Observer), 2017: EGMO 2017 Staff (Observer), 2018: EGMO 2018 Staff (Guest) |
| Klara | Drofenik | 2015: Slovenia (Contestant 1), 2016: Slovenia (Contestant 1), 2017: Slovenia (Contestant 2: Honourable Mention), 2018: Slovenia (Deputy Leader), 2023: EGMO 2023 Staff (Guide: Netherlands) |
| Lovro | Drofenik | 2023: EGMO 2023 Staff (Coordinator), 2025: EGMO 2025 Staff (Coordinator) |
| Leticija | Dubickaitė | 2015: Lithuania (Contestant 2), 2016: Lithuania (Contestant 2) |
| Sofiya | Dubova | 2014: Ukraine (Contestant 2: Gold Medal), 2015: Ukraine (Contestant 2: Gold Medal) |
| Kateryna | Dudko | 2024: Ukraine (Observer with Leader) |
| Greta | Duko | 2020: Lithuania (Contestant 2) |
| Erion | Dula | 2014: Albania (Leader) |
| Feyza | Duman | 2012: Türkiye (Contestant 2), 2014: Türkiye (Contestant 2: Silver Medal), 2015: Türkiye (Contestant 1: Silver Medal), 2016: Türkiye (Contestant 2: Gold Medal) |
| Léa | Dumont | 2017: Belgium (Contestant 2) |
| Mia Leonor | Dunn Bertha | 2023: Ecuador (Contestant 1) |
| Jocelyn | Dunstan | 2012: EGMO 2012 Staff (Invigilator) |
| Paula | Duque | 2024: Colombia (Contestant 1) |
| Mehmet Eren | Durlanık | 2014: Türkiye B (Deputy Leader) |
| Heidi | Durrёsi | 2019: Albania (Contestant 2: Honourable Mention) |
| Tuğba | Durukan | 2014: EGMO 2014 Staff (TÜBİTAK) |
| Silvia | Duţu | 2016: EGMO 2016 Staff (Invigilator) |
| Nia | Dvalidze | 2024: EGMO 2024 Staff (Guide: Japan) |
| Roberto | Dvornicich | 2018: EGMO 2018 Staff (Jury Chair) |
| Kamma | Dyhr | 2019: Denmark (Contestant 1: Honourable Mention) |
| Davit | Dzadzamia | 2024: EGMO 2024 Staff (Guide: Republic of Moldova, Coordinator) |
| Rugilė | Dzindzalietaitė | 2023: Lithuania (Contestant 1), 2024: Lithuania (Contestant 4: Honourable Mention), 2025: Lithuania (Contestant 4: Bronze Medal) |
| Volha | Dziuba | 2015: EGMO 2015 Staff (Guide: The former Yugoslav Republic of Macedonia) |
| Tekla | Dzotsenidze | 2024: EGMO 2024 Staff (Guide: Cyprus) |
| Almedin | Dzudzevic | 2014: EGMO 2014 Staff (Guide: Republic of Moldova) |
| Alka | Earathu | 2015: Mexico (Contestant 3: Bronze Medal), 2016: Mexico (Contestant 2: Silver Medal) |
| Evelyn | Ebneter | 2021: Switzerland (Contestant 3), 2022: Switzerland (Contestant 2: Honourable Mention), 2023: Switzerland (Contestant 4: Honourable Mention), 2024: Switzerland (Contestant 1: Bronze Medal), 2025: Switzerland (Contestant 1: Bronze Medal) |
| Bernadett | Eckert | 2012: Hungary (Deputy Leader) |
| Andrei | Eckstein | 2016: EGMO 2016 Staff (Coordinator), 2025: Romania (Observer with Leader) |
| Anna | Economou | 2016: Cyprus (Contestant 1: Honourable Mention), 2017: Cyprus (Contestant 1: Honourable Mention) |
| Chantal | Eggenberger | 2017: EGMO 2017 Staff (Invigilator) |
| Anouk | Eggink | 2017: Netherlands (Contestant 2), 2018: Netherlands (Contestant 3: Bronze Medal) |
| Tímea | Eisner | 2022: EGMO 2022 Staff (Deputy Chief Guide) |
| Dorottya | Elekes | 2024: Hungary (Contestant 3: Silver Medal), 2025: Hungary (Contestant 1: Bronze Medal) |
| András | Éles | 2022: EGMO 2022 Staff (Coordinator) |
| Ejota | Elezaj | 2023: Kosovo (Contestant 4), 2025: EGMO 2025 Staff (Guide: France) |
| Şahin | Emrah | 2014: EGMO 2014 Staff (Problem Selection, Coordinator), 2015: Türkiye (Leader), 2017: Türkiye (Deputy Leader), 2018: Türkiye (Deputy Leader), 2019: Türkiye (Deputy Leader) |
| Medina | Emušić | 2023: EGMO 2023 Staff (Guide: Bosnia and Herzegovina) |
| Viviana | Ene | 2016: EGMO 2016 Staff (Guest Speaker) |
| Anastasia | Erakleous-Theodorou | 2017: Cyprus (Leader) |
| Dóra | Erdélyi | 2022: EGMO 2022 Staff (Guide: Belgium) |
| Zehra | Erdem | 2014: Türkiye B (Contestant 1: Bronze Medal) |
| Enkhjin | Erdenebat | 2024: Mongolia (Contestant 1: Bronze Medal) |
| Büşra | Erdoğan | 2014: EGMO 2014 Staff (Guide: Japan, Switzerland) |
| Semeli | Ergatoudi | 2020: Cyprus (Contestant 4), 2021: Cyprus (Contestant 1) |
| Ekin | Ergen | 2018: EGMO 2018 Staff (Guide: Azerbaijan, Türkiye) |
| Anne-Maria | Ernvall-Hytönen | 2012: Finland (Leader), 2014: Finland (Leader), 2017: EGMO 2017 Staff (Coordinator), 2018: Finland (Leader), 2019: Finland (Leader), 2020: EGMO 2020 Staff (Coordinator), 2021: Finland (Leader), 2023: Finland (Leader), 2024: EGMO 2024 Staff (Coordinator), 2025: EGMO 2025 Staff (Coordinator) |
| Hasan Hüseyin | Eruslu | 2014: EGMO 2014 Staff (Coordinator) |
| Céline | Erzberger | 2017: EGMO 2017 Staff (Invigilator, Staff) |
| Andrea | Escalona Contreras | 2022: Mexico (Contestant 2: Bronze Medal), 2023: Mexico (Contestant 4: Bronze Medal), 2025: Mexico (Deputy Leader) |
| Alèxia | Escudero Ribó | 2023: Spain (Contestant 2: Silver Medal) |
| Paula | Esquerrà Giné | 2020: Spain (Contestant 3), 2021: Spain (Contestant 1) |
| Tolga | Etgü | 2014: EGMO 2014 Staff (Coordinator) |
| Sarah | Etter | 2017: EGMO 2017 Staff (Staff) |
| Mari Linda | Eulate Peña | 2021: Bolivia (Contestant 2) |
| Myriam | Faltin | 2025: Switzerland (Contestant 2: Honourable Mention) |
| Floria Xin Yi | Fang Zhang | 2019: Costa Rica (Contestant 4) |
| Margrith | Fankhauser | 2017: EGMO 2017 Staff (Logistics) |
| Maja | Farazin | 2023: EGMO 2023 Staff (Guide: Albania) |
| Miriam | Farber | 2018: Israel (Deputy Leader), 2019: Israel (Deputy Leader), 2020: Israel (Deputy Leader), 2021: Israel (Deputy Leader), 2022: Israel (Deputy Leader) |
| Nazrin | Farziyeva | 2016: Azerbaijan (Contestant 1), 2017: Azerbaijan (Contestant 2: Honourable Mention) |
| Hannah | Faucheu | 2021: France (Contestant 1: Bronze Medal), 2022: France (Contestant 1: Bronze Medal) |
| Giuseppe | Fava | 2018: EGMO 2018 Staff (Guide: Costa Rica, Mexico) |
| Anna | Fehér | 2022: EGMO 2022 Staff (Entertainment) |
| Panna Tímea | Fekete | 2014: Hungary (Contestant 3: Bronze Medal), 2015: Hungary (Contestant 2: Silver Medal), 2017: Hungary (Deputy Leader), 2018: Hungary (Deputy Leader), 2019: Hungary (Leader), 2020: Hungary (Leader), 2021: Hungary (Leader), 2022: EGMO 2022 Staff (Chief Guide, Organiser) |
| Svenja | Felber | 2025: Switzerland (Contestant 4: Bronze Medal) |
| Julia | Feld | 2017: EGMO 2017 Staff (Guide: Türkiye) |
| Bernard | Felten | 2013: Luxembourg (Leader, Local Organization Committee), 2014: Luxembourg (Deputy Leader) |
| Vicky | Feng | 2019: Australia (Contestant 3: Honourable Mention) |
| Carla | Fermin | 2018: Peru (Contestant 3: Honourable Mention), 2019: Peru (Contestant 2: Gold Medal), 2020: Peru (Contestant 1: Gold Medal), 2021: Peru (Contestant 1: Gold Medal), 2022: Peru (Contestant 1: Gold Medal) |
| Mekayla Akarshani | Fernando | 2025: Sri Lanka (Contestant 1) |
| Sara | Ferreira | 2025: Slovenia (Contestant 2: Honourable Mention) |
| Mircea | Fianu | 2016: EGMO 2016 Staff (Coordinator) |
| Ceri | Fiddes | 2012: EGMO 2012 Staff (Competition Director, EGMO Committee) |
| Leonora | Fiļa | 2019: Latvia (Contestant 4: Honourable Mention) |
| Julia | Filip | 2020: Poland (Contestant 3: Bronze Medal), 2021: Poland (Contestant 2: Silver Medal) |
| Ljubica | Filipova | 2017: The former Yugoslav Republic of Macedonia (Contestant 3) |
| Petar | Filipovski | 2025: North Macedonia (Leader) |
| Sude | Filiz | 2019: Türkiye (Contestant 2: Silver Medal) |
| Jasmin | Fischli | 2017: EGMO 2017 Staff (Guide: Brazil) |
| Zsigmond György | Fleiner | 2022: EGMO 2022 Staff (Guide: Tajikistan) |
| Monserrat del Pilar | Flores Choqueticlla | 2021: Bolivia (Contestant 4) |
| Alejandra Melody | Flores Poma | 2021: Bolivia (Contestant 1) |
| Ángela María | Flores Ruiz | 2024: Mexico (Contestant 3: Bronze Medal), 2025: Mexico (Contestant 2: Honourable Mention) |
| Georgiana | Florescu | 2016: EGMO 2016 Staff (Invigilator) |
| Liliana | Florez Hernandez | 2017: EGMO 2017 Staff (Guide: Costa Rica, Mexico) |
| Viktória | Földvári | 2022: EGMO 2022 Staff (Organiser) |
| Diana | Fomina | 2015: Belarus B (Contestant 1: Bronze Medal) |
| Maria Clara | Fontes Silva | 2024: Brazil (Contestant 4: Bronze Medal), 2025: Brazil (Contestant 4: Bronze Medal) |
| Katherine | Forbes | 2019: Canada (Contestant 1: Honourable Mention) |
| Antongiulio | Fornasiero | 2018: EGMO 2018 Staff (Staff) |
| Mary | Fortune | 2012: EGMO 2012 Staff (Guide: Belgium, Hungary) |
| Ingerid Marie | Fosli | 2013: Norway (Contestant 1: Silver Medal) |
| Hannah | Fox | 2024: United States of America (Contestant 2: Gold Medal), 2025: United States of America (Contestant 2: Gold Medal) |
| Ádám | Fraknói | 2022: EGMO 2022 Staff (Coordinator) |
| Ariadna | Franch Pérez | 2023: Spain (Contestant 3), 2025: Spain (Contestant 3: Honourable Mention) |
| Andreea | Francu | 2025: Republic of Moldova (Contestant 4: Honourable Mention) |
| Liudmyla | Frankevych | 2022: Ukraine (Observer with Contestants) |
| Yevheniia | Frankevych | 2022: Ukraine (Contestant 1: Silver Medal), 2023: Ukraine (Contestant 1: Silver Medal), 2024: Ukraine (Contestant 1: Gold Medal) |
| Ajda | Frankovič | 2023: EGMO 2023 Staff (Guide: Norway) |
| Giada | Franz | 2012: Italy (Contestant 3: Gold Medal), 2013: Italy (Contestant 3: Gold Medal), 2014: Italy (Deputy Leader), 2015: Italy (Deputy Leader), 2016: Italy (Deputy Leader), 2017: Italy (Observer with Leader), 2018: EGMO 2018 Staff (Coordinator) |
| Cyril Jonas | Frei | 2013: Switzerland (Deputy Leader), 2017: EGMO 2017 Staff (Logistics) |
| Raquel | Freire Fernández | 2024: Spain (Contestant 3: Honourable Mention) |
| Péter | Frenkel | 2022: EGMO 2022 Staff (Jury Chair) |
| Ilsa | Freysoldt | 2025: Germany (Contestant 2: Silver Medal) |
| Martha | Friederich | 2020: Germany (Contestant 1: Bronze Medal) |
| Nogah | Friedman | 2020: Israel (Contestant 4: Silver Medal), 2021: Israel (Contestant 2: Gold Medal), 2022: Israel (Contestant 2: Gold Medal), 2023: Israel (Contestant 1: Gold Medal) |
| Anna | Frolova | 2021: Latvia (Contestant 3) |
| Alberte Møller | Frost | 2023: Denmark (Contestant 1), 2024: Denmark (Contestant 1: Honourable Mention) |
| Kamille Møller | Frost | 2019: Denmark (Contestant 2), 2020: Denmark (Contestant 1) |
| Mihaela | Frunzeti | 2016: EGMO 2016 Staff (Staff) |
| Marta | Fuentes Zamoro | 2018: Spain (Contestant 2) |
| Takahiko | Fujita | 2015: Japan (Leader), 2016: Japan (Leader), 2019: Japan (Leader), 2022: Japan (Leader), 2023: Japan (Leader) |
| Csilla | Fülöp | 2022: Hungary (Contestant 1: Gold Medal), 2023: Hungary (Contestant 1: Gold Medal) |
| Lorenzo | Furio | 2018: EGMO 2018 Staff (Guide: Slovenia) |
| Minori | Furukawa | 2023: Japan (Contestant 1: Bronze Medal), 2024: Japan (Contestant 1: Silver Medal) |
| Daors | Fusha | 2025: EGMO 2025 Staff (Guide: Ireland) |
| Elisabeth | Gaar | 2021: Austria (Deputy Leader) |
| Auriane | Gabaut | 2025: France (Observer with Contestants) |
| Cécile | Gachet | 2014: France (Contestant 3: Bronze Medal) |
| Héloïse | Gachet | 2017: France (Contestant 2: Bronze Medal) |
| Aneta | Gacovska Barandovska | 2020: North Macedonia (Leader), 2021: North Macedonia (Leader), 2022: North Macedonia (Leader), 2023: North Macedonia (Leader), 2024: North Macedonia (Leader) |
| Lara | Gafner | 2017: EGMO 2017 Staff (Guide: Hungary) |
| Simona | Gagarova | 2024: Bulgaria (Contestant 1: Bronze Medal) |
| Bidzina | Gagnidze | 2024: EGMO 2024 Staff (Coordinator) |
| Olesia | Gaiduk | 2021: Germany (Contestant 2: Bronze Medal), 2022: Germany (Contestant 1: Silver Medal) |
| Elīza | Gaile | 2016: Latvia (Contestant 3) |
| Diana | Gainutdinova | 2018: Russian Federation (Contestant 1: Gold Medal) |
| Hanna | Gál | 2016: Hungary (Contestant 3) |
| Silvia Giulia | Galfrè | 2018: EGMO 2018 Staff (Chief Guide) |
| Stephanie Vanessa | Gallegos Caamaño | 2019: Ecuador (Contestant 3), 2020: Ecuador (Contestant 1) |
| Andrea | Gallese | 2018: EGMO 2018 Staff (Guide: Bulgaria) |
| Julian | Galliano | 2018: EGMO 2018 Staff (Guide: Finland) |
| Diane | Gallois-Wong | 2014: France (Deputy Leader) |
| Maša | Galun | 2023: EGMO 2023 Staff (Staff) |
| Mariana | Galvarro | 2018: Bolivia (Contestant 3) |
| Rafiga | Gambarova | 2024: Azerbaijan (Contestant 1: Honourable Mention) |
| Lilia | Gamezardashvili | 2024: EGMO 2024 Staff (Guide: Estonia) |
| Daniela | Ganea | 2016: EGMO 2016 Staff (Staff) |
| Dulguun | Gansukh | 2023: Mongolia (Contestant 1: Bronze Medal), 2024: Mongolia (Contestant 2: Silver Medal) |
| Aleksei | Ganyukov | 2024: Estonia (Deputy Leader), 2025: Estonia (Deputy Leader) |
| Fuad | Garayev | 2017: Azerbaijan (Leader), 2018: Azerbaijan (Leader), 2019: Azerbaijan (Leader), 2020: Azerbaijan (Leader) |
| Fidan | Garayeva | 2019: Azerbaijan (Contestant 2: Bronze Medal), 2020: Azerbaijan (Contestant 3: Bronze Medal), 2021: Azerbaijan (Contestant 1: Bronze Medal), 2022: Azerbaijan (Contestant 1: Gold Medal), 2023: Azerbaijan (Contestant 1: Gold Medal) |
| Berta | Garcia | 2016: Spain (Contestant 1: Silver Medal) |
| Natalia | Garcia | 2019: Chile (Leader), 2020: Chile (Deputy Leader) |
| María Cristina | García | 2021: Ecuador (Contestant 4) |
| Tony | Gardiner | 2012: EGMO 2012 Staff (Coordinator) |
| Anuradha | Garge | 2020: India (Observer with Contestants) |
| María Sofía | Garro Carranza | 2018: Costa Rica (Leader) |
| Anesë | Gashi | 2020: Kosovo (Contestant 3) |
| Diar | Gashi | 2024: Kosovo (Deputy Leader), 2025: Kosovo (Leader), 2025: Kosovo B (Leader) |
| Mehdi | Gashi | 2025: EGMO 2025 Staff (Deputy Chief Guide) |
| Vjollca | Gashi | 2020: Kosovo (Deputy Leader) |
| Yllka | Gashi | 2020: Kosovo (Contestant 1) |
| Ricarda | Gassner | 2017: EGMO 2017 Staff (Invigilator) |
| Louise | Gassot | 2015: France (Deputy Leader) |
| Veronica | Gavagna | 2017: EGMO 2017 Staff (Observer), 2018: EGMO 2018 Staff (Staff, Treasurer) |
| Naida | Gavranović | 2022: Bosnia and Herzegovina (Contestant 3: Bronze Medal), 2023: Bosnia and Herzegovina (Contestant 1: Silver Medal) |
| Elizaveta | Gavrilova | 2019: Latvia (Contestant 3: Honourable Mention) |
| Eulàlia | Gaya Bretones | 2025: Spain (Contestant 4: Honourable Mention) |
| Ariane | Gayout | 2013: France (Contestant 4: Honourable Mention) |
| Luca Éva | Gazdag | 2014: Norway (Contestant 1) |
| James | Gazet | 2012: EGMO 2012 Staff (Coordinator) |
| Paula | Gazituaga García | 2019: Spain (Contestant 2) |
| Eva | Ge | 2019: Australia (Contestant 1: Honourable Mention), 2021: Australia (Contestant 4) |
| Silvio | Geel | 2017: EGMO 2017 Staff (Logistics) |
| Barbara | Geissmann | 2017: EGMO 2017 Staff (Staff) |
| Demetre | Gelashvili | 2024: EGMO 2024 Staff (Coordinator) |
| Jan | Genc | 2023: EGMO 2023 Staff (Coordinator) |
| Susanne | Gennow | 2013: Sweden (Deputy Leader) |
| Felicia | Georgescu | 2016: EGMO 2016 Staff (Staff) |
| Magdalena | Georgescu | 2016: EGMO 2016 Staff (Staff) |
| Magdalena | Georgieva | 2015: Bulgaria (Contestant 3: Silver Medal) |
| Marco | Gerber | 2014: Switzerland (Observer with Leader), 2017: EGMO 2017 Staff (Media) |
| Balázs | Gerencsér | 2022: EGMO 2022 Staff (Coordinator) |
| Caroline | Germeaux | 2013: EGMO 2013 Staff (Guide: Belgium, France, Italy, Luxembourg, Switzerland), 2017: EGMO 2017 Staff (Staff) |
| Oğuz | Gezmiş | 2014: EGMO 2014 Staff (Academic assistant) |
| France | Gheeraert | 2013: Belgium (Contestant 2), 2014: Belgium (Contestant 3), 2015: Belgium (Contestant 3) |
| Anca | Gheorghe | 2016: EGMO 2016 Staff (Staff) |
| Vlada | Gherciu | 2019: Republic of Moldova (Contestant 4: Bronze Medal) |
| Cătălin | Gherghe | 2016: EGMO 2016 Staff (Staff, Problem Selection) |
| Elena | Ghilardi | 2021: Italy (Contestant 2), 2022: Italy (Contestant 2: Silver Medal), 2023: Italy (Contestant 3: Silver Medal) |
| Marina | Ghisi | 2018: EGMO 2018 Staff (Chief Invigilator) |
| Bagdan | Gilevich | 2015: EGMO 2015 Staff (Coordinator) |
| Mauro | Giliberti | 2018: EGMO 2018 Staff (Guide: Japan) |
| Valeriu | Gînga | 2019: Republic of Moldova (Deputy Leader) |
| Juanita | Giraldo | 2023: Colombia (Contestant 1) |
| Leo | Gitin | 2018: EGMO 2018 Staff (Guide: Russian Federation) |
| Art | Gjuli | 2025: EGMO 2025 Staff (Guide: Israel) |
| Boriana | Gjura | 2014: Albania (Contestant 1) |
| Federico | Glaudo | 2018: EGMO 2018 Staff (Coordinator) |
| Valeria Luce | Glauser | 2017: EGMO 2017 Staff (Guide: Italy, Japan) |
| Rebekah | Glaze | 2022: United Kingdom (Contestant 2: Bronze Medal) |
| Mihaela | Gledacheva | 2019: Bulgaria (Contestant 4: Gold Medal), 2020: Bulgaria (Contestant 4: Bronze Medal), 2021: Bulgaria (Contestant 3: Bronze Medal) |
| Sarah | Gleghorn | 2019: United Kingdom (Contestant 2: Silver Medal), 2020: United Kingdom (Contestant 2: Silver Medal) |
| Štefánia | Glevitzká | 2019: Slovakia (Contestant 2: Bronze Medal) |
| Viera | Glevitzká | 2022: Slovakia (Contestant 2: Honourable Mention) |
| Yael | Gliksman | 2018: Israel (Contestant 3: Honourable Mention) |
| Massimo | Gobbino | 2018: EGMO 2018 Staff (Problem Selection Chair), 2019: Italy (Observer with Leader) |
| Ingeborg | Goddijn | 2020: EGMO 2020 Staff (Organiser) |
| Wendy | Goemans | 2020: Belgium (Deputy Leader) |
| Tiana | Goergen | 2013: EGMO 2013 Staff (Guide: Finland, Latvia, Norway) |
| Julia | Gog | 2012: EGMO 2012 Staff (Chief Invigilator) |
| Roxana | Goga | 2016: EGMO 2016 Staff (Staff) |
| Ivane | Gokadze | 2016: Georgia (Leader), 2017: Georgia (Leader), 2018: Georgia (Leader), 2019: Georgia (Leader), 2020: Georgia (Leader, EGMO AB), 2021: Georgia (Leader, EGMO AB), 2022: Georgia (Deputy Leader, EGMO Board), 2023: Georgia (Deputy Leader), 2024: EGMO 2024 Staff (Organiser) |
| Vefa | Göksel | 2014: EGMO 2014 Staff (Coordinator) |
| Ida Sofie | Goldschmidt | 2020: Denmark (Contestant 2) |
| Ed | Goldsmith | 2012: EGMO 2012 Staff (Invigilator) |
| Marianna | Gołębiewska | 2022: Poland (Contestant 1: Honourable Mention) |
| Mayya | Golitsyna | 2018: Ireland (Deputy Leader), 2023: Ireland (Leader), 2024: Ireland (Leader) |
| Radu | Gologan | 2016: EGMO 2016 Staff (Staff, Problem Selection) |
| Arina | Goloubitskaya | 2016: Belarus (Contestant 4: Bronze Medal), 2017: Belarus (Contestant 2: Bronze Medal), 2018: Belarus (Contestant 1: Silver Medal) |
| Bayarmagnai | Gombodorj | 2018: Mongolia (Leader) |
| Sherry | Gong | 2012: United States of America (Deputy Leader), 2013: United States of America (Leader), 2014: United States of America (Leader), 2015: United States of America (Deputy Leader), 2016: United States of America (Deputy Leader), 2017: United States of America (Leader), 2018: United States of America (Observer with Contestants) |
| Sofia | González | 2024: Colombia (Contestant 4) |
| Léa | González Buonocore | 2024: Spain (Contestant 4) |
| Beatriz | Gonzalo Carvajal | 2019: Spain (Contestant 4) |
| Maria | Gorelik | 2016: Israel (Deputy Leader), 2024: Israel (Deputy Leader) |
| Edith Bille | Gørtz | 2021: Denmark (Contestant 2) |
| Yuliya | Goryaeva | 2015: EGMO 2015 Staff (Guide: Hungary) |
| Nikolozi | Goshadze | 2024: EGMO 2024 Staff (Guide: North Macedonia) |
| Nives | Gošnjak | 2022: Slovenia (Contestant 2: Honourable Mention), 2023: Slovenia (Contestant 3), 2024: Slovenia (Contestant 3: Bronze Medal) |
| Aanya | Goyal | 2021: United Kingdom (Contestant 1: Bronze Medal), 2022: United Kingdom (Observer with Contestants), 2023: United Kingdom (Contestant 1: Silver Medal), 2024: United Kingdom (Contestant 1: Silver Medal), 2025: United Kingdom (Contestant 1: Silver Medal) |
| Rohan | Goyal | 2023: India (Deputy Leader) |
| Claudia | Graf | 2017: EGMO 2017 Staff (Staff) |
| Daniel | Graf | 2017: EGMO 2017 Staff (Staff) |
| Ellen | Grant-Smith | 2025: South Africa (Contestant 2: Bronze Medal) |
| Gerda | Grase | 2016: Latvia (Contestant 2) |
| Mateja | Grašič | 2023: EGMO 2023 Staff (Media) |
| Aurel | Graur | 2016: EGMO 2016 Staff (Staff) |
| Mikaela | Gray | 2020: Australia (Contestant 4: Bronze Medal), 2021: Australia (Contestant 3: Bronze Medal) |
| Rachel | Greenhalgh | 2012: EGMO 2012 Staff (EGMO Committee) |
| Aoife | Gregg | 2013: Ireland (Contestant 2) |
| Paula | Greitane | 2020: Latvia (Contestant 3) |
| Laura | Gremion | 2012: Switzerland (Contestant 1: Bronze Medal) |
| Deimantė | Grigaliūnaitė | 2022: Lithuania (Contestant 2: Honourable Mention), 2023: Lithuania (Contestant 2: Bronze Medal) |
| Ioana | Grigoras | 2014: Ireland (Contestant 2), 2015: Ireland (Contestant 2), 2016: Ireland (Contestant 3: Bronze Medal) |
| Daniel | Grigorescu | 2016: EGMO 2016 Staff (Staff) |
| Katarina | Grilj | 2020: Slovenia (Contestant 1), 2021: Slovenia (Contestant 1: Bronze Medal), 2022: Slovenia (Contestant 3: Bronze Medal), 2023: Slovenia (Contestant 1: Silver Medal), 2024: Slovenia (Deputy Leader) |
| Natalia | Grinberg | 2017: EGMO 2017 Staff (Coordinator) |
| Maria | Grinchuk | 2019: EGMO 2019 Staff (Guide: Republic of Moldova) |
| Maria | Gringlaz | 2017: Israel (Deputy Leader) |
| Mădălina | Griza | 2019: Republic of Moldova (Contestant 1: Bronze Medal), 2020: Republic of Moldova (Contestant 2: Bronze Medal), 2021: Republic of Moldova (Contestant 2) |
| Katinka Maria | Grønnegaard | 2022: Denmark (Contestant 3) |
| Bor | Grošelj Simić | 2023: EGMO 2023 Staff (Guide: Bulgaria) |
| Nicole | Grosman | 2019: Israel (Contestant 3: Honourable Mention), 2020: Israel (Contestant 3: Bronze Medal), 2021: Israel (Contestant 4) |
| Vinod Kumar | Grover | 2019: India (Leader) |
| Petra | Grubišić | 2022: Croatia (Contestant 3: Honourable Mention) |
| Aistė | Grušnytė | 2015: Lithuania (Contestant 3), 2016: Lithuania (Contestant 3), 2017: Lithuania (Contestant 1: Honourable Mention) |
| Elisabeth | Gruwé | 2013: Belgium (Contestant 3: Honourable Mention) |
| Heinrich Josef | Gstöttner | 2018: Austria (Deputy Leader) |
| Tong | Gu. | 2025: Japan (Contestant 4: Silver Medal) |
| Camila | Guajardo | 2019: Chile (Contestant 1: Bronze Medal) |
| Susana Noemi | Guastay Morocho | 2020: Ecuador (Contestant 4) |
| Maria Laura | Guevara | 2019: Peru (Deputy Leader), 2020: Peru (Deputy Leader), 2021: Peru (Deputy Leader), 2022: Peru (Leader) |
| Melek | Güngör | 2022: Türkiye (Contestant 3: Silver Medal), 2023: Türkiye (Contestant 2: Gold Medal), 2025: EGMO 2025 Staff (Coordinator) |
| Demi | Guo | 2016: United States of America (Contestant 2: Bronze Medal) |
| Jiayi | Guo | 2024: People's Republic of China (Contestant 3: Gold Medal) |
| Yifan | Guo | 2018: Australia (Contestant 4: Honourable Mention) |
| Meghal | Gupta | 2015: United States of America (Contestant 1: Silver Medal), 2016: United States of America (Contestant 3: Gold Medal), 2018: United States of America (Leader), 2019: United States of America (Leader), 2020: United States of America (Leader), 2021: United States of America (Deputy Leader), 2023: United States of America (Deputy Leader) |
| Shreya | Gupta Ray | 2025: India (Contestant 4: Bronze Medal) |
| Tsotne | Gurabanidze | 2024: EGMO 2024 Staff (Guide: Mexico) |
| Mangala | Gurjar | 2016: India (Observer with Contestants), 2019: India (Observer with Contestants) |
| Stefany | Gutierrez | 2022: Bolivia (Contestant 3) |
| Fernanda | Gutiérrez Barros | 2019: Chile (Contestant 2: Honourable Mention), 2020: Chile (Contestant 1: Silver Medal) |
| Linda | Gutsche | 2016: France (Contestant 1: Silver Medal), 2017: France (Contestant 3: Bronze Medal) |
| Valeriu | Guțu | 2022: Republic of Moldova (Leader) |
| Rusanda | Guzun | 2018: Republic of Moldova (Contestant 2: Honourable Mention), 2019: Republic of Moldova (Contestant 2: Bronze Medal), 2020: Republic of Moldova (Contestant 1) |
| Anastasia | Gvasalia | 2024: Georgia (Contestant 3) |
| Máté | Gyarmati | 2022: EGMO 2022 Staff (Coordinator) |
| Zalán | Gyarmati | 2022: EGMO 2022 Staff (Entertainment) |
| Zoltán | Gyenes | 2022: EGMO 2022 Staff (Coordinator) |
| Bernadett | Gyimesi | 2022: EGMO 2022 Staff (Entertainment) |
| Ágoston | Győrffy | 2022: EGMO 2022 Staff (Coordinator) |
| Johanna | Győrffy | 2021: Hungary (Contestant 4: Bronze Medal), 2022: EGMO 2022 Staff (Guide: India) |
| Szuzina | Gyulai-Nagy | 2014: Hungary (Contestant 4: Bronze Medal), 2015: Hungary (Contestant 3: Bronze Medal) |
| Jimena | H. Loría | 2022: Costa Rica (Contestant 2) |
| Pierre | Haas | 2012: Luxembourg (Leader), 2013: EGMO 2013 Staff (Problem Selection, Coordinator), 2014: Luxembourg (Leader), 2015: Luxembourg (Leader), 2016: Luxembourg (Leader), 2017: Luxembourg (Leader), 2018: Luxembourg (Leader), 2019: Luxembourg (Leader), 2020: Luxembourg (Leader), 2021: Luxembourg (Leader) |
| Melia | Haase | 2023: Germany (Contestant 2: Silver Medal), 2024: Germany (Contestant 2: Silver Medal) |
| Mursalin | Habib | 2022: Bangladesh (Deputy Leader) |
| Javid | Habibov | 2017: Azerbaijan (Deputy Leader), 2018: Azerbaijan (Deputy Leader) |
| Fatmah | Habibullah | 2015: Saudi Arabia (Observer with Contestants) |
| Maja | Habjanič | 2023: EGMO 2023 Staff (Guide: Belgium) |
| Redi | Haderi | 2016: Albania (Deputy Leader) |
| Georgia | Hadjipanayiotou | 2017: Cyprus (Contestant 3), 2019: Cyprus (Contestant 2) |
| Mihaela | Hadjiska | 2019: North Macedonia (Contestant 1: Bronze Medal) |
| Louis | Hainaut | 2017: EGMO 2017 Staff (Coordinator), 2020: EGMO 2020 Staff (Coordinator) |
| Noemi | Hajdu | 2018: EGMO 2018 Staff (Guide: Ireland, United Kingdom) |
| Ajan | Hajrullahu | 2025: EGMO 2025 Staff (Guide: Armenia) |
| Lenka | Hake | 2020: Slovakia (Contestant 1), 2021: Slovakia (Contestant 2) |
| Khaled | Halaoua | 2022: Syria (Deputy Leader) |
| Aulona | Halilaj | 2025: EGMO 2025 Staff (Guide: Estonia) |
| Emna | Hamdi | 2025: Tunisia (Contestant 4: Honourable Mention) |
| Nuša | Hameršak | 2023: EGMO 2023 Staff (Guide: Tajikistan) |
| Mehmet | Hamidoğlu | 2014: EGMO 2014 Staff (Coordinator) |
| Letizia | Hamitaj | 2018: EGMO 2018 Staff (Guide: Albania, Mongolia) |
| Ardisa | Hamiti | 2025: EGMO 2025 Staff (Guide: Mexico) |
| Jona | Hamiti | 2025: EGMO 2025 Staff (Deputy Guide) |
| Rinesa | Hamiti | 2020: Kosovo (Contestant 4), 2021: Kosovo (Contestant 3) |
| Maria | Hammer | 2019: Austria (Contestant 1) |
| Janka | Hámori | 2019: Hungary (Contestant 3: Silver Medal), 2020: Hungary (Contestant 1: Gold Medal), 2021: Hungary (Contestant 2: Silver Medal) |
| Tianyi | Han | 2024: Belgium (Contestant 2) |
| Doris | Hana | 2018: EGMO 2018 Staff (Guide: Republic of Moldova, Romania) |
| Benjamin | Handley | 2025: EGMO 2025 Staff (Coordinator) |
| Mary | Hanley | 2015: Ireland (Leader), 2020: Ireland (Leader) |
| Soma | Hansel | 2022: EGMO 2022 Staff (Coordinator) |
| Camilla Skov | Hansen | 2025: Denmark (Contestant 3) |
| Karen Birgitta | Hanssen | 2022: Norway (Contestant 3: Honourable Mention) |
| Amelie | Hao | 2024: Finland (Contestant 3), 2025: Finland (Contestant 1: Honourable Mention) |
| Viktor | Harangi | 2022: EGMO 2022 Staff (Coordinator) |
| Alina | Harbuzova | 2017: Ukraine (Contestant 2: Gold Medal), 2018: Ukraine (Contestant 1: Gold Medal), 2019: EGMO 2019 Staff (Coordinator), 2024: Ukraine (Deputy Leader) |
| Elona | Hasa | 2025: Albania (Deputy Leader) |
| Md Zahidul | Hasan | 2023: Bangladesh (Deputy Leader) |
| Emina | Hasanbegović | 2024: Bosnia and Herzegovina (Contestant 4: Bronze Medal) |
| Nigar | Hasanova | 2018: Azerbaijan (Observer with Contestants), 2020: Azerbaijan (Observer with Deputy) |
| Yorkinoy | Hasanova | 2025: Uzbekistan (Contestant 3) |
| Hasan | Hasanzade | 2021: Azerbaijan (Leader), 2022: Azerbaijan (Leader) |
| Vadym | Hassieiev | 2024: EGMO 2024 Staff (Coordinator) |
| Rina | Hatachi | 2024: Japan (Contestant 2: Silver Medal), 2025: Japan (Contestant 1: Gold Medal) |
| Anastasiya | Haurylava | 2015: EGMO 2015 Staff (Chief Guide) |
| Rok | Havlas | 2018: Slovenia (Leader) |
| Anton | Havryliuk | 2024: EGMO 2024 Staff (Coordinator) |
| Satoshi | Hayakawa | 2019: Japan (Observer with Leader) |
| Kristina | Hayrapetyan | 2025: Armenia (Contestant 1: Bronze Medal) |
| Roni | Hazan | 2020: Israel (Contestant 2) |
| Besnik | Haziri | 2025: EGMO 2025 Staff (Guide: Mongolia) |
| Grace | He | 2018: Australia (Contestant 1: Silver Medal), 2019: Australia (Contestant 2: Silver Medal), 2020: Australia (Contestant 1: Gold Medal), 2022: Australia (Observer with Deputy), 2024: Australia (Deputy Leader), 2025: Australia (Observer with Leader) |
| Zejia | He | 2019: Norway (Contestant 1), 2020: Norway (Contestant 1), 2021: Norway (Contestant 1), 2022: Norway (Contestant 1) |
| Nicole | Hedblom | 2023: EGMO 2023 Staff (Coordinator) |
| Dániel | Hegedűs | 2022: EGMO 2022 Staff (Deputy Chief Guide) |
| Lise | Heier | 2014: Norway (Deputy Leader) |
| Mina Johanne | Heier | 2022: Norway (Contestant 4), 2023: Norway (Contestant 1: Bronze Medal) |
| Simone | Heimgartner | 2017: EGMO 2017 Staff (Guide: The former Yugoslav Republic of Macedonia) |
| Vianne | Heinz | 2025: Germany (Contestant 3: Silver Medal) |
| Sandra | Heller | 2017: EGMO 2017 Staff (Guide: Republic of Moldova, Romania) |
| Sanuthi Thedara | Hemachandra | 2025: Sri Lanka (Contestant 4) |
| Sarah | Henderson | 2020: United Kingdom (Contestant 3: Bronze Medal) |
| Polina | Henyk | 2022: Ukraine (Contestant 2: Silver Medal), 2023: Ukraine (Contestant 2: Gold Medal), 2024: EGMO 2024 Staff (Coordinator) |
| Defne | Hergül | 2025: Türkiye (Contestant 2: Gold Medal) |
| Kamila | Hermesh | 2019: EGMO 2019 Staff (Guide: Australia) |
| Myriam | Hernández Ketchul | 2022: Mexico (Leader), 2024: Mexico (Leader), 2025: Mexico (Leader, EGMO Board) |
| Adéla | Heroudková | 2019: Czechia (Contestant 1: Honourable Mention), 2020: Czechia (Contestant 1), 2021: Czechia (Contestant 3: Bronze Medal) |
| Heike Karin | Herr | 2018: EGMO 2018 Staff (Guide: Germany, Liechtenstein) |
| Sarah | Herrmann | 2012: United States of America (Contestant 1: Bronze Medal) |
| Bence | Hervay | 2022: EGMO 2022 Staff (Guide: Slovenia) |
| Elnaz | Hessami-Pilehrood | 2018: Canada (Contestant 1: Silver Medal), 2021: Canada (Deputy Leader), 2022: Canada (Observer with Deputy) |
| Harun | Hindija | 2016: Bosnia and Herzegovina (Leader) |
| Fuma | Hirayama | 2024: Japan (Observer with Leader) |
| Yurika | Hirobe | 2015: Japan (Contestant 1: Bronze Medal) |
| Minna | Hirvonen | 2014: Finland (Contestant 1) |
| Torvei Johanne Medhus | Hjelvik | 2024: Norway (Contestant 2) |
| Veronika | Hladíková | 2017: Czechia (Contestant 1: Bronze Medal) |
| Cristina | Hlevca | 2016: EGMO 2016 Staff (Chief Guide) |
| Réka | Hodossy | 2025: Hungary (Contestant 2: Silver Medal) |
| Anna | Hoduń | 2013: Poland (Contestant 2: Silver Medal), 2014: Poland (Contestant 2: Bronze Medal) |
| Line | Hoeltgen | 2012: Luxembourg (Contestant 3: Honourable Mention), 2013: EGMO 2013 Staff (Staff, Invigilator) |
| Annalena | Hofer | 2013: Switzerland (Contestant 2), 2014: Switzerland (Contestant 1), 2017: EGMO 2017 Staff (Guide: Israel) |
| Lisa | Hofer | 2017: EGMO 2017 Staff (Guide: Netherlands) |
| Audhild | Høgåsen | 2014: Norway (Contestant 2) |
| Ema | Hojan | 2023: Slovenia B (Contestant 4: Honourable Mention) |
| Maria | Holdcroft | 2013: United Kingdom (Contestant 1: Bronze Medal) |
| Iryna | Holobotovska | 2019: EGMO 2019 Staff (Guide Team Lead) |
| Karl Erik | Holter | 2022: EGMO 2022 Staff (Coordinator) |
| Aurelia | Honerkamp-Smith | 2012: EGMO 2012 Staff (Invigilator) |
| Maryna | Horbach | 2020: Belarus (Contestant 4: Honourable Mention), 2021: Belarus (Contestant 1: Bronze Medal) |
| Luka | Horjak | 2021: Slovenia (Deputy Leader), 2022: Slovenia (Deputy Leader), 2023: EGMO 2023 Staff (Chief Coordinator), 2025: EGMO 2025 Staff (Coordinator) |
| Vladlena | Horneț | 2014: Republic of Moldova (Contestant 3) |
| Kateryna | Horokh | 2018: Ukraine (Contestant 2: Silver Medal), 2019: Ukraine (Contestant 2: Gold Medal) |
| Yelyzaveta | Horokh | 2020: Ukraine (Contestant 1: Silver Medal), 2021: Ukraine (Contestant 1: Silver Medal), 2022: Ukraine (Contestant 3: Gold Medal) |
| Áron | Horváth | 2022: EGMO 2022 Staff (Guide) |
| Csongor | Horváth | 2022: EGMO 2022 Staff (Guide: Bulgaria) |
| Hanga | Horváth | 2022: EGMO 2022 Staff (Guide: France) |
| Taisuke | Hoshino | 2023: Japan (Observer with Leader) |
| Halyna | Hotsaliuk | 2019: EGMO 2019 Staff (Guide: Ireland) |
| Sander | Houwen | 2020: EGMO 2020 Staff (Crew) |
| Enes | Hoxha | 2025: EGMO 2025 Staff (Guide: Bangladesh) |
| Fiton | Hoxha | 2024: EGMO 2024 Staff (Coordinator), 2025: EGMO 2025 Staff (Problem Selection, Coordinator) |
| Mateja | Hrast | 2023: EGMO 2023 Staff (Senior Guide) |
| Vera | Hretskaya | 2022: Belarus (Contestant 3: Bronze Medal) |
| Kata | Hristov | 2022: Serbia (Contestant 2: Honourable Mention) |
| Cordelia | Hu | 2023: Canada (Contestant 4: Bronze Medal) |
| Hefeng | Hu | 2025: Sri Lanka (Observer with Contestants) |
| Shuwen | Hu | 2023: People's Republic of China (Contestant 1: Gold Medal) |
| Yuting (Samanda) | Hu | 2016: Norway (Contestant 4), 2017: Norway (Contestant 4: Honourable Mention) |
| Cindy | Hua | 2017: France (Contestant 4: Bronze Medal) |
| Antonia | Huang | 2015: Ireland (Contestant 1), 2016: Ireland (Contestant 1), 2017: Ireland (Contestant 1: Bronze Medal) |
| Claire | Huang | 2020: Australia (Contestant 2: Silver Medal), 2022: Australia (Observer with Deputy) |
| Julia | Huang | 2012: United States of America (Contestant 2: Bronze Medal) |
| Wendy | Huang | 2024: Netherlands (Contestant 1), 2025: Netherlands (Contestant 1: Bronze Medal) |
| Yixin | Huang | 2018: Ireland (Contestant 4: Honourable Mention), 2019: Ireland (Contestant 4: Honourable Mention) |
| Yuqi | Huang | 2025: Sri Lanka (Contestant 2) |
| Isabel | Hubard | 2015: Mexico (Deputy Leader), 2016: Mexico (Leader), 2017: Mexico (Leader), 2018: Mexico (Deputy Leader), 2019: Mexico (Leader), 2020: Mexico (Leader), 2021: Mexico (Observer with Leader), 2023: EGMO 2023 Staff (Coordinator, Problem Selection) |
| Lorenz | Hübel | 2022: Austria (Deputy Leader) |
| Vera | Hug | 2017: EGMO 2017 Staff (Invigilator) |
| Mel | Hugg | 2025: Australia (Observer with Contestants) |
| Sophie | Huiberts | 2020: EGMO 2020 Staff (Organiser) |
| Jeroen | Huijben | 2020: EGMO 2020 Staff (Coordinator) |
| Bálint | Hujter | 2022: EGMO 2022 Staff (Coordinator) |
| Sally Anne | Huk | 2012: EGMO 2012 Staff (Chief Guide) |
| Nadzeya | Hulko | 2015: EGMO 2015 Staff (Guide: Norway) |
| Andrii | Hutsal | 2019: EGMO 2019 Staff (Guide: United Kingdom) |
| Anna | Huysmans | 2025: Belgium (Contestant 2) |
| Joni | Hyseni | 2025: EGMO 2025 Staff (Guide: Poland) |
| Rizonë | Hyseni | 2025: EGMO 2025 Staff (Guide: Spain) |
| Enkel | Hysnelaj | 2021: Albania (Observer with Leader), 2022: Albania (Deputy Leader) |
| Matilde | Iannaccone | 2023: Italy (Contestant 4: Honourable Mention), 2024: Italy (Contestant 3: Silver Medal), 2025: Italy (Contestant 3: Silver Medal) |
| Zahra | Ibishova | 2024: Azerbaijan (Contestant 4: Honourable Mention) |
| Edesa | Ibrahimi | 2025: EGMO 2025 Staff (Guide: United States of America) |
| Emira | Ibrahimović | 2021: Bosnia and Herzegovina (Contestant 3: Silver Medal), 2022: Bosnia and Herzegovina (Contestant 1: Gold Medal) |
| Hana | Ibrahimpašić | 2023: EGMO 2023 Staff (Guide: Türkiye) |
| Mihnea | Ichim | 2016: EGMO 2016 Staff (Guide: United Kingdom) |
| Nahian Parin | Ifa | 2025: Bangladesh (Contestant 4) |
| Jennifer | Iglesias | 2013: United States of America (Deputy Leader), 2014: United States of America (Deputy Leader), 2015: United States of America (Leader), 2016: United States of America (Leader), 2017: United States of America (Deputy Leader) |
| Liviu | Ignat | 2016: EGMO 2016 Staff (Coordinator) |
| Risa | Iguchi | 2024: Japan (Contestant 3: Bronze Medal) |
| Netta | Ilani | 2023: Israel (Contestant 3: Bronze Medal), 2024: Israel (Contestant 1: Gold Medal), 2025: Israel (Contestant 1: Gold Medal) |
| Ahmet | İleri | 2022: Türkiye (Deputy Leader), 2023: Türkiye (Observer with Leader), 2024: Türkiye (Observer with Leader), 2025: Türkiye (Observer with Leader) |
| Merve | İlhan | 2014: EGMO 2014 Staff (Guide: Finland) |
| Evgenia | Ilia | 2016: Cyprus (Contestant 4) |
| Ana | Ilić | 2024: Serbia (Contestant 4: Bronze Medal) |
| Marian Zamfir | Ilie | 2016: EGMO 2016 Staff (Staff) |
| Jasna | Ilieva | 2020: North Macedonia (Contestant 3: Silver Medal), 2021: North Macedonia (Contestant 3: Silver Medal), 2022: North Macedonia (Contestant 3: Bronze Medal) |
| Nadezhda | Ilieva | 2016: The former Yugoslav Republic of Macedonia (Contestant 3), 2017: The former Yugoslav Republic of Macedonia (Contestant 2: Honourable Mention), 2018: The former Yugoslav Republic of Macedonia (Contestant 2: Bronze Medal) |
| Tsvetelina | Ilieva | 2022: Bulgaria (Contestant 2: Silver Medal), 2023: Bulgaria (Contestant 3: Silver Medal) |
| Ana | Illanes Martínez de la Vega | 2020: Mexico (Contestant 3: Silver Medal), 2021: Mexico (Contestant 1: Gold Medal), 2022: Mexico (Contestant 1: Silver Medal) |
| Marina | Ilyina | 2023: Belarus (Contestant 3: Bronze Medal), 2024: Belarus (Contestant 1: Honourable Mention) |
| Valentin | Imbach | 2023: EGMO 2023 Staff (Coordinator) |
| Erza | Imeraj | 2025: Kosovo B (Contestant 4) |
| András | Imolay | 2022: EGMO 2022 Staff (Coordinator) |
| Ana Paula | Indacochea Rosado | 2016: Ecuador (Contestant 3), 2018: Ecuador (Contestant 1: Bronze Medal), 2019: Ecuador (Leader), 2020: Ecuador (Leader), 2021: Ecuador (Leader), 2022: Ecuador (Leader) |
| María Gratzia | Indacochea Rosado | 2017: Ecuador (Contestant 2: Honourable Mention), 2018: Ecuador (Contestant 4: Bronze Medal), 2019: Ecuador (Contestant 2: Bronze Medal), 2020: Ecuador (Deputy Leader), 2021: Ecuador (Deputy Leader), 2022: Ecuador (Deputy Leader) |
| María José | Indacochea Rosado | 2021: Ecuador (Contestant 3), 2022: Ecuador (Contestant 1), 2024: Ecuador (Contestant 1) |
| Alper | İnecik | 2014: EGMO 2014 Staff (Coordinator) |
| Eirini | Ioannou | 2017: Cyprus (Contestant 2: Honourable Mention), 2018: Cyprus (Contestant 1: Honourable Mention), 2019: Cyprus (Contestant 1: Bronze Medal) |
| Mihai | Iordache | 2016: EGMO 2016 Staff (Guide: Poland) |
| Bianca | Iordachi | 2022: Republic of Moldova (Contestant 4: Bronze Medal), 2023: Republic of Moldova (Contestant 3: Honourable Mention), 2024: Republic of Moldova (Contestant 3: Honourable Mention), 2025: Republic of Moldova (Contestant 3: Honourable Mention) |
| Elisa | Ipate | 2022: Romania (Contestant 2: Silver Medal) |
| Alessandro | Iraci | 2018: EGMO 2018 Staff (Staff) |
| Ilze | Irbe | 2012: Latvia (Contestant 2), 2018: Latvia (Deputy Leader), 2020: Latvia (Leader), 2021: Latvia (Deputy Leader), 2022: Latvia (Deputy Leader), 2024: Latvia (Deputy Leader), 2025: Latvia (Deputy Leader) |
| Vesna | Iršič | 2013: Slovenia (Deputy Leader), 2023: EGMO 2023 Staff (Problem Selection) |
| Laura | Irvine | 2012: EGMO 2012 Staff (Guide: Finland, Romania) |
| Pavel | Irzhauski | 2015: EGMO 2015 Staff (Coordinator) |
| Karinakhon | Ishankulova | 2021: Kyrgyzstan (Contestant 3) |
| Atsuya | Ishida | 2024: Japan (Observer with Leader) |
| Makhamadkhan | Ishmatov | 2021: Kyrgyzstan (Leader), 2022: Kyrgyzstan (Leader), 2025: Kyrgyzstan (Leader) |
| vesë | islami | 2025: EGMO 2025 Staff (Guide: Lithuania) |
| Kadyebek | İsmailov | 2014: EGMO 2014 Staff (Guide: Latvia) |
| Farid | Ismayilov | 2024: Azerbaijan (Leader) |
| Assel | Ismoldayeva | 2018: Bulgaria (Contestant 2: Honourable Mention) |
| Ami | Isoda | 2016: Japan (Contestant 1: Bronze Medal) |
| Giovanni | Italiano | 2018: EGMO 2018 Staff (Guide: Italy, Italy B) |
| Yuji | Ito | 2014: Japan (Leader) |
| Ralina | Iusupova | 2020: Russian Federation (Contestant 2: Silver Medal), 2021: Russian Federation (Contestant 1: Gold Medal) |
| Maria-Romina | Ivan | 2014: Romania (Contestant 4: Bronze Medal), 2015: Romania (Contestant 2: Silver Medal), 2016: Romania (Deputy Leader), 2016: Romania B (Deputy Leader), 2020: EGMO 2020 Staff (Coordinator), 2022: EGMO 2022 Staff (Problem Selection, Coordinator), 2023: EGMO 2023 Staff (Coordinator), 2025: EGMO 2025 Staff (Problem Selection, Coordinator) |
| Roksolana | Ivanchuk | 2019: Ukraine B (Contestant 3: Bronze Medal), 2020: Ukraine (Contestant 2: Honourable Mention), 2021: Ukraine (Contestant 2: Silver Medal) |
| Jelena | Ivančić | 2017: Serbia (Contestant 2: Gold Medal), 2018: Serbia (Contestant 1: Gold Medal), 2019: Serbia (Contestant 1: Gold Medal), 2020: Serbia (Contestant 1: Gold Medal) |
| Artur | Ivanou | 2015: EGMO 2015 Staff (Guide: Slovenia) |
| Dona-Maria | Ivanova | 2015: Bulgaria (Contestant 4: Bronze Medal) |
| Velina | Ivanova | 2013: Bulgaria (Contestant 3: Silver Medal), 2014: Bulgaria (Contestant 3: Gold Medal), 2018: Bulgaria (Deputy Leader), 2019: Bulgaria (Deputy Leader), 2020: Bulgaria (Deputy Leader), 2021: Bulgaria (Leader) |
| Mariam | Ivardava | 2019: Georgia (Contestant 4: Silver Medal), 2020: Georgia (Contestant 3: Bronze Medal), 2021: Georgia (Contestant 4), 2023: Georgia (Leader), 2024: Georgia (Leader) |
| Uma T. V. | Iyer | 2016: India (Contestant 2: Bronze Medal) |
| Ana-Maria | Izbas | 2021: Republic of Moldova (Contestant 4), 2023: Republic of Moldova (Contestant 2) |
| Jesse | Jääsaari | 2013: Finland (Deputy Leader) |
| Aleksandra | Jach | 2020: Norway (Contestant 3) |
| Eva | Jacob | 2023: France (Contestant 2) |
| Aimée | Jacobs | 2016: Netherlands (Contestant 2), 2017: Netherlands (Contestant 3: Honourable Mention) |
| Pierre-Alain | Jacqmin | 2012: Belgium (Deputy Leader), 2013: Belgium (Deputy Leader), 2014: Belgium (Deputy Leader), 2015: Belgium (Deputy Leader), 2016: Belgium (Deputy Leader), 2017: Belgium (Deputy Leader) |
| Fidan | Jafarli | 2021: Azerbaijan (Contestant 2), 2022: Azerbaijan (Contestant 2: Bronze Medal), 2023: Azerbaijan (Contestant 4: Honourable Mention) |
| Ava | Jahan Biglari | 2014: Islamic Republic of Iran (Contestant 2) |
| Akmaral | Jakibayeva | 2018: Kazakhstan (Contestant 4: Honourable Mention) |
| Franc | Jaklič | 2023: EGMO 2023 Staff (Senior Guide) |
| Lucca Starup | Jakobsen | 2025: Denmark (Contestant 4) |
| Alena | Janáčková | 2023: Czechia (Contestant 3: Bronze Medal) |
| Miha | Janežič | 2023: EGMO 2023 Staff (Guide: Tunisia) |
| Iga | Janik | 2020: Poland (Contestant 1: Silver Medal) |
| Zsuzsanna | Jankó | 2022: EGMO 2022 Staff (Coordinator), 2025: EGMO 2025 Staff (Coordinator) |
| Áron | Jánosik | 2022: EGMO 2022 Staff (Guide) |
| Era | Januzi | 2023: Kosovo (Contestant 2: Honourable Mention), 2025: EGMO 2025 Staff (Guide: Finland) |
| Barnabás | Janzer | 2022: EGMO 2022 Staff (Coordinator) |
| Orsolya Lili | Janzer | 2017: Hungary (Contestant 3: Gold Medal), 2018: Hungary (Contestant 1: Silver Medal), 2022: Hungary B (Deputy Leader) |
| Dielli | Jashari | 2025: EGMO 2025 Staff (Guide: Republic of Moldova) |
| Yllkë | Jashari | 2022: Kosovo (Contestant 1: Honourable Mention), 2025: Kosovo (Deputy Leader), 2025: Kosovo B (Deputy Leader) |
| Nathalia del Carmen | Jasso Vera | 2019: Mexico (Contestant 4: Honourable Mention), 2020: Mexico (Contestant 4: Bronze Medal) |
| Justyna | Jaworska | 2019: Poland (Contestant 2: Gold Medal), 2020: Poland (Contestant 2: Gold Medal), 2021: Poland (Deputy Leader), 2022: Poland (Leader), 2023: Poland (Leader), 2024: Poland (Leader), 2025: Poland (Deputy Leader) |
| Mikó | Jázmin | 2022: EGMO 2022 Staff (Deputy Chief Guide) |
| Pál | Jedlovszky | 2022: EGMO 2022 Staff (Guide: Bosnia and Herzegovina) |
| Marija | Jelic | 2013: Serbia (Deputy Leader), 2014: Serbia (Deputy Leader), 2015: Serbia (Deputy Leader), 2016: Serbia (Deputy Leader), 2017: EGMO 2017 Staff (Coordinator) |
| Bogdana | Jelić | 2014: Serbia (Contestant 4: Silver Medal), 2015: Serbia (Contestant 2: Gold Medal) |
| Tea | Jeličić | 2018: Slovenia (Contestant 2), 2019: Slovenia (Contestant 2: Silver Medal), 2020: Slovenia (Deputy Leader) |
| Andraž | Jelinčič | 2023: EGMO 2023 Staff (Coordinator) |
| Nouha | Jemel | 2023: Tunisia (Contestant 3), 2025: Tunisia (Contestant 2) |
| Hana | Jereb | 2023: EGMO 2023 Staff (Guide: Denmark) |
| Lara | Jerman | 2013: Slovenia (Contestant 1: Honourable Mention), 2014: Slovenia (Contestant 2: Bronze Medal) |
| Gerard | Jeurnink | 2020: EGMO 2020 Staff (Organiser) |
| Lizi | Jghenti | 2024: EGMO 2024 Staff (Guide: Switzerland) |
| Kaylee | Ji | 2021: Canada (Contestant 4: Gold Medal), 2022: United States of America (Contestant 2: Silver Medal) |
| Alansha | Jiang | 2025: United States of America (Contestant 3: Gold Medal) |
| Mingyi | Jiang | 2025: People's Republic of China (Contestant 1: Silver Medal) |
| Lucía María | Jiménez Abarca | 2018: Costa Rica (Contestant 4) |
| Ana Paula | Jiménez Díaz | 2017: Mexico (Contestant 1: Silver Medal), 2018: Mexico (Contestant 4: Silver Medal), 2019: Mexico (Contestant 1: Gold Medal), 2020: Mexico (Contestant 1: Gold Medal), 2023: Mexico (Deputy Leader), 2024: Mexico (Deputy Leader) |
| Susana | Jiménez Valverde | 2020: Costa Rica (Contestant 2) |
| Mihail | Jitaru | 2016: EGMO 2016 Staff (Guide: Slovenia) |
| Guerra | José Manuel | 2022: Bolivia (Deputy Leader) |
| Megan | Joshi | 2018: United States of America (Contestant 4: Silver Medal) |
| Rohinee | Joshi | 2019: India (Contestant 3: Silver Medal), 2022: India (Observer with Contestants) |
| Laure-Line | Jouniaux | 2025: Belgium (Contestant 3: Honourable Mention) |
| Milja | Jovanović | 2020: Serbia (Contestant 4: Silver Medal), 2021: Serbia (Contestant 4: Bronze Medal) |
| Sofija | Jovanović | 2023: Serbia (Contestant 2) |
| Alina | Ju | 2025: Netherlands (Contestant 2: Bronze Medal) |
| Ieva Elija | Jucevičiūtė | 2017: Lithuania (Contestant 2: Bronze Medal), 2018: Lithuania (Contestant 2: Bronze Medal) |
| Mariam | Jugheli | 2024: EGMO 2024 Staff (Guide) |
| Tibor | Juhász | 2022: EGMO 2022 Staff (Treasurer) |
| Ari | Juniku | 2025: EGMO 2025 Staff (Guide: Denmark) |
| Charlotte | Junod | 2012: Switzerland (Contestant 3) |
| Relinde | Jurrius | 2020: EGMO 2020 Staff (Organiser) |
| Nini | Jvarsheishvili | 2024: EGMO 2024 Staff (Chief Guide: Lithuania) |
| Ulrika | Kaara | 2020: Finland (Contestant 1) |
| Eszter | Kabos | 2013: Hungary (Contestant 3: Bronze Medal), 2014: Hungary (Contestant 1: Gold Medal), 2015: Hungary (Deputy Leader), 2016: Hungary (Deputy Leader), 2022: EGMO 2022 Staff (Organiser) |
| Nijada | Kacmoli | 2021: Albania (Contestant 4) |
| Fehmi Emre | Kadan | 2013: Türkiye (Deputy Leader), 2014: EGMO 2014 Staff (Problem Selection) |
| Vesna | Kadelburg | 2012: EGMO 2012 Staff (Coordinator, EGMO Committee), 2023: EGMO 2023 Staff (Coordinator, Problem Selection) |
| Zoran | Kadelburg | 2012: Serbia (Leader) |
| Ida Agerlin | Kähler | 2019: Denmark (Contestant 3) |
| Aruzhan | Kairat | 2025: Kazakhstan (Contestant 3: Bronze Medal) |
| Teo | Kakabadze | 2024: EGMO 2024 Staff (Coordinator) |
| Sonia | Kakoulli | 2019: Cyprus (Contestant 4) |
| Hana | Kalábová | 2024: Slovakia (Contestant 3: Bronze Medal) |
| Varga | Kalantarov | 2014: EGMO 2014 Staff (Coordinator) |
| Çağıl | Kalender | 2013: Türkiye (Contestant 2: Bronze Medal), 2014: Türkiye B (Contestant 2), 2015: Türkiye (Contestant 2: Silver Medal) |
| Elene | Kalinichenko | 2021: Georgia B (Contestant 4), 2024: EGMO 2024 Staff (Chief Guide: United Kingdom) |
| Vanesa | Kalinkova | 2025: Bulgaria (Contestant 4: Bronze Medal) |
| Gledis | Kallco | 2023: Albania (Deputy Leader), 2025: EGMO 2025 Staff (Jury Chair) |
| Nina | Kamčev | 2024: Croatia (Deputy Leader) |
| Nastarin | Kamolova | 2025: Uzbekistan (Contestant 2: Bronze Medal) |
| Sarah | Kamp | 2017: EGMO 2017 Staff (Guide: India, Slovenia) |
| Rada | Kamysheva | 2020: Switzerland (Contestant 4) |
| Tomoka | Kan | 2016: United Kingdom (Contestant 2: Bronze Medal) |
| Shuho | Kanda | 2021: Japan (Observer with Leader), 2022: Japan (Deputy Leader) |
| Yuliya | Kandrusik | 2015: EGMO 2015 Staff (Guide) |
| Enada | Kanina | 2025: Albania (Contestant 3) |
| Tamar | Kapanadze | 2024: EGMO 2024 Staff (Guide: Finland) |
| Johannes | Kapfhammer | 2017: EGMO 2017 Staff (Staff) |
| Pavel | Kaplunou | 2015: EGMO 2015 Staff (Guide: Ireland) |
| Melike Ayşegül | Kara | 2013: Türkiye (Contestant 3: Honourable Mention), 2014: Türkiye (Contestant 3: Bronze Medal), 2015: Türkiye (Contestant 3: Silver Medal) |
| Bora | Karaçica | 2025: EGMO 2025 Staff (Guide: Kyrgyzstan) |
| Zeynep Ebrar | Karadeniz | 2021: Türkiye (Contestant 2: Silver Medal) |
| Christina | Karafyllia | 2020: Greece (Contestant 3) |
| Elene | Karangozishvili | 2016: Georgia (Contestant 1: Silver Medal) |
| Pihla | Karanko | 2012: Finland (Contestant 1), 2013: Finland (Contestant 1: Honourable Mention), 2020: Finland (Deputy Leader) |
| Dimitrios | Karantanos | 2018: Cyprus (Leader), 2023: Cyprus (Leader) |
| Klára | Karasová | 2016: Czechia (Contestant 1) |
| Farrukh | Karimov | 2021: Tajikistan (Leader) |
| Lizi | Karkashadze | 2024: EGMO 2024 Staff (Guide: Belgium) |
| Mikhail | Karpuk | 2013: Belarus (Leader), 2014: Belarus (Leader), 2015: EGMO 2015 Staff (Problem Selection, Coordinator), 2016: Belarus (Leader), 2017: Belarus (Leader), 2018: Belarus (Leader), 2019: Belarus (Leader), 2020: Belarus (Leader), 2021: Belarus (Leader), 2022: Belarus (Leader) |
| Rodoula | Karyou | 2020: Cyprus (Contestant 1) |
| Chiaki | Kasahara | 2014: Japan (Contestant 1: Silver Medal) |
| Viktar | Kaskevich | 2015: EGMO 2015 Staff (Coordinator, Coordinator) |
| Aray | Kassenova | 2022: Kazakhstan (Contestant 4: Honourable Mention), 2024: Kazakhstan (Contestant 2: Bronze Medal), 2025: Kazakhstan (Contestant 1: Bronze Medal) |
| Romualdas | Kašuba | 2015: Lithuania (Leader), 2016: Lithuania (Deputy Leader), 2017: Lithuania (Deputy Leader), 2018: Lithuania (Deputy Leader), 2019: Lithuania (Deputy Leader), 2020: Lithuania (Deputy Leader), 2022: Lithuania (Deputy Leader), 2023: Lithuania (Deputy Leader) |
| Hinako | Katafuchi | 2018: Japan (Contestant 1: Silver Medal) |
| Toshiki | Kataoka | 2014: Japan (Observer with Leader) |
| Assel | Katayeva | 2018: Kazakhstan (Contestant 3: Bronze Medal), 2019: Kazakhstan (Contestant 2: Silver Medal) |
| Milenko | Katic | 2012: Serbia (Observer with Deputy) |
| Mirjana | Katic | 2012: Serbia (Deputy Leader) |
| Annija | Katkevica | 2015: Latvia (Contestant 3) |
| Iuliia | Katunina | 2025: Kazakhstan (Contestant 4: Silver Medal) |
| Mirjam | Kauppila | 2014: Finland (Contestant 2: Bronze Medal), 2015: Finland (Deputy Leader) |
| Kerime Nur | Kavadar | 2020: Türkiye (Contestant 2: Silver Medal) |
| Artem | Kavara | 2019: EGMO 2019 Staff (Guide: Serbia) |
| Sumire | Kawasaki | 2024: Japan (Contestant 4: Silver Medal) |
| Abeer | Kawthar | 2012: Saudi Arabia (Observer with Contestants) |
| Hale Nur | Kazaçeşme | 2014: EGMO 2014 Staff (Academic assistant) |
| Anna | Kazhamiakina | 2025: Italy (Contestant 4: Gold Medal) |
| Sadia Hamid | Kazi | 2025: Bangladesh (Deputy Leader) |
| Ashley | Ke | 2020: United States of America (Contestant 2: Silver Medal) |
| Elizabeth | Ke | 2020: United States of America (Contestant 3: Silver Medal) |
| Liza | Kebuladze | 2024: EGMO 2024 Staff (Guide: Ecuador) |
| Varvara | Kechagia | 2023: Cyprus (Contestant 4) |
| Manuela | Kehl | 2017: EGMO 2017 Staff (Guide: Kazakhstan) |
| Viviane | Kehl | 2012: Switzerland (Contestant 2: Bronze Medal), 2013: Switzerland (Contestant 3: Silver Medal), 2014: Switzerland (Deputy Leader), 2015: Switzerland (Leader), 2016: Switzerland (Leader, EGMO AB), 2017: EGMO 2017 Staff (Chief Invigilator, EGMO AB, Organizing Committee), 2018: Switzerland (Leader, EGMO AB), 2019: Switzerland (Leader, EGMO AB), 2020: EGMO 2020 Staff (Coordinator, EGMO AB), 2022: EGMO 2022 Staff (EGMO Board), 2023: EGMO 2023 Staff (Coordinator, EGMO Board), 2024: EGMO 2024 Staff (Chief Coordinator, EGMO Board), 2025: EGMO 2025 Staff (Coordinator, EGMO Board) |
| Giorgi | Kekenadze | 2024: EGMO 2024 Staff (Coordinator) |
| Tomáš | Kekeňák | 2023: Slovakia (Observer with Deputy) |
| Barbara | Kelava | 2022: Croatia (Contestant 4: Honourable Mention), 2023: Croatia (Contestant 1: Bronze Medal) |
| Anna | Kelemen | 2022: EGMO 2022 Staff (Guide: United States of America) |
| Julian | Kellerhals | 2017: EGMO 2017 Staff (Jury Chair) |
| Anna | Kelley | 2018: Canada (Contestant 2: Bronze Medal), 2019: Canada (Contestant 2: Bronze Medal), 2020: Canada (Contestant 2: Bronze Medal), 2021: Canada (Observer with Deputy), 2023: Canada (Leader) |
| Youcef | Kenane | 2024: Algeria (Observer with Deputy) |
| Amira | Kenbayeva | 2023: Kazakhstan (Contestant 3: Bronze Medal), 2024: Kazakhstan (Contestant 1: Silver Medal) |
| Aizhan | Kenzhebayeva | 2021: Kazakhstan (Contestant 4), 2022: Kazakhstan (Contestant 1: Bronze Medal) |
| Katarzyna | Kępińska | 2017: Poland (Contestant 2: Silver Medal), 2019: Poland (Contestant 3: Gold Medal), 2022: Poland (Deputy Leader), 2023: Poland (Deputy Leader), 2024: Poland (Deputy Leader), 2025: Poland (Leader) |
| Anita | Kercsó-Molnár | 2022: Hungary B (Contestant 1: Silver Medal), 2023: Hungary (Contestant 4: Bronze Medal) |
| Anna | Kerekes | 2017: Hungary (Contestant 2: Silver Medal), 2018: Hungary (Contestant 2: Silver Medal), 2019: Hungary (Contestant 1: Gold Medal), 2022: EGMO 2022 Staff (Coordinator) |
| Andreja | Kerenčič | 2023: EGMO 2023 Staff (Guide: Azerbaijan) |
| Zsófia | Keresztély | 2024: Hungary (Contestant 2: Bronze Medal), 2025: Hungary (Contestant 3: Gold Medal) |
| Azer | Kerimov | 2013: EGMO 2013 Staff (EGMO AB), 2014: EGMO 2014 Staff (Jury Chair, EGMO AB), 2015: EGMO 2015 Staff (EGMO AB, Coordinator), 2016: Türkiye (Leader), 2017: Türkiye (Leader), 2018: Türkiye (Leader), 2019: Türkiye (Leader), 2020: Türkiye (Leader), 2021: Türkiye (Leader), 2022: Türkiye (Leader), 2023: Türkiye (Leader), 2024: Türkiye (Leader), 2025: Türkiye (Leader) |
| Doris | Keršič | 2016: Slovenia (Contestant 2), 2022: Slovenia (Observer with Deputy), 2023: EGMO 2023 Staff (Chief Guide, Entertainment) |
| Agnese | Kerubina | 2012: Latvia (Contestant 1: Bronze Medal) |
| Nikoloz | Ketiladze | 2024: EGMO 2024 Staff (Chief Guide: United States of America) |
| Lola | Khabibova | 2019: EGMO 2019 Staff (Guide: Peru) |
| Elaa | Khachnaoui | 2017: Tunisia (Contestant 3) |
| Nursultan | Khajimuratov | 2017: Kazakhstan (Deputy Leader), 2018: Kazakhstan (Deputy Leader), 2019: Kazakhstan (Deputy Leader), 2020: Kazakhstan (Deputy Leader), 2021: Kazakhstan (Deputy Leader) |
| Olena | Kharytonova | 2012: Ukraine (Contestant 4: Silver Medal), 2013: Ukraine (Contestant 4: Bronze Medal) |
| Omniyyah | Khawjah | 2015: Saudi Arabia (Contestant 2) |
| Mohamed Mehdi | Khayeche | 2015: Tunisia (Deputy Leader) |
| Sára | Khayouti | 2015: Hungary (Contestant 4: Silver Medal) |
| Nino | Khidasheli | 2024: EGMO 2024 Staff (Guide: Taiwan) |
| Danylo | Khilko | 2015: EGMO 2015 Staff (Coordinator) |
| Malika | Khojamuratova | 2025: Uzbekistan (Contestant 4: Bronze Medal) |
| Oleksandra | Khomyshyn | 2019: EGMO 2019 Staff (Guide: United States of America) |
| Rashid | Khorrami | 2017: EGMO 2017 Staff (Invigilator, Staff) |
| Nataliia | Khotiaintseva | 2014: Ukraine (Contestant 3: Gold Medal), 2015: Ukraine (Contestant 3: Gold Medal), 2019: EGMO 2019 Staff (Coordinator), 2024: EGMO 2024 Staff (Coordinator) |
| Ming Ming | Khov | 2017: EGMO 2017 Staff (Deputy Chief Guide) |
| Ludmila | Khudenko | 2015: EGMO 2015 Staff (Organization Committee) |
| Irakli | Khutsishvili | 2024: EGMO 2024 Staff (Coordinator) |
| Gvantsa | Khvedelidze | 2024: Georgia B (Contestant 3) |
| Anesa | Kiçmari | 2025: EGMO 2025 Staff (Guide: Kosovo B) |
| Lukasz | Kidzinski | 2013: EGMO 2013 Staff (Coordinator) |
| Mariia | Kiiko | 2024: Ireland (Contestant 3) |
| Nini | Kiladze | 2024: EGMO 2024 Staff (Guide: Azerbaijan) |
| Jueun | Kim | 2018: Belgium (Contestant 2) |
| Fionn | Kimber O'Shea | 2025: Ireland (Deputy Leader) |
| Haruka | Kimura | 2025: Japan (Contestant 2: Silver Medal) |
| Tasuki | Kinjo | 2018: Japan (Observer with Leader) |
| Patricia | Király | 2023: Slovenia (Contestant 4), 2024: Slovenia (Contestant 4: Bronze Medal), 2025: Slovenia (Contestant 3: Silver Medal) |
| Nino | Kirtadze | 2024: EGMO 2024 Staff (Guide: Greece) |
| Kirke | Kisand | 2023: Estonia (Contestant 1: Honourable Mention), 2024: Estonia (Contestant 1) |
| Ali Ulaş Özgür | Kişisel | 2014: EGMO 2014 Staff (Coordinator) |
| Eszter | Kiss | 2012: Hungary (Contestant 4: Bronze Medal) |
| Melinda | Kiss | 2012: Hungary (Contestant 1: Bronze Medal), 2019: Hungary (Deputy Leader), 2020: Hungary (Deputy Leader), 2021: Hungary (Deputy Leader, EGMO AB), 2022: Hungary (Leader, EGMO Board), 2022: Hungary B (Leader), 2023: Hungary (Leader, EGMO Board), 2024: Hungary (Leader), 2025: Hungary (Leader) |
| Imre | Kisvárdai | 2022: EGMO 2022 Staff (Guide: Denmark) |
| Takuma | Kitamura | 2014: Japan (Observer with Leader) |
| Yuji | Kitayama | 2025: Japan (Observer with Leader) |
| Léonie | Kittel | 2018: France (Contestant 1: Silver Medal), 2019: France (Contestant 1: Silver Medal) |
| Louna | Kiuru | 2025: Finland (Contestant 4: Honourable Mention) |
| Bohdan | Kivva | 2019: EGMO 2019 Staff (Coordinator) |
| Yaroslav | Kivva | 2019: Ukraine (Leader) |
| İrem Beyza | Kılıç | 2025: Türkiye (Observer with Leader) |
| Can | Kızılkan | 2014: EGMO 2014 Staff (Guide, TÜBİTAK) |
| Asude Ebrar | Kızıloğlu | 2016: Türkiye (Contestant 3: Bronze Medal), 2018: Türkiye (Contestant 2: Bronze Medal), 2019: Türkiye (Contestant 3: Silver Medal) |
| Freja Rytter | Kjelde | 2022: Denmark (Contestant 2: Honourable Mention), 2023: Denmark (Contestant 3: Bronze Medal), 2024: Denmark (Contestant 3) |
| Urška | Klančar | 2023: EGMO 2023 Staff (Senior Guide) |
| Maj Leandro | Klančnik Kunstelj | 2023: EGMO 2023 Staff (Guide: France) |
| Ivana | Klasovita | 2016: Switzerland (Contestant 1), 2017: Switzerland (Contestant 4: Bronze Medal), 2018: Liechtenstein (Leader) |
| Viera | Klasovita | 2015: Switzerland (Contestant 1), 2016: Switzerland (Contestant 2), 2017: Switzerland (Contestant 3: Honourable Mention), 2018: Switzerland (Deputy Leader) |
| Viktória | Klász | 2016: Hungary (Contestant 4: Bronze Medal), 2022: EGMO 2022 Staff (Coordinator), 2024: EGMO 2024 Staff (Coordinator) |
| Davit | Kldiashvili | 2024: EGMO 2024 Staff (Coordinator) |
| Maya | Kleinstein | 2018: Israel (Contestant 4), 2019: Israel (Contestant 1), 2020: Israel (Contestant 1: Bronze Medal) |
| Marija | Klemenčič | 2023: EGMO 2023 Staff (Guide: Slovenia B) |
| Petra | Klepac | 2012: EGMO 2012 Staff (Invigilator) |
| Johannes | Kleppe | 2022: EGMO 2022 Staff (Coordinator) |
| Nika | Klidashvili | 2024: EGMO 2024 Staff (Guide: Romania) |
| Brina | Klobčaver | 2023: EGMO 2023 Staff (Guide: Canada) |
| Marjanne | Klom | 2020: EGMO 2020 Staff (Organiser) |
| Oleksiy | Klurman | 2019: EGMO 2019 Staff (Chief Coordinator, Problem Selection Chair) |
| Jan Willem | Knopper | 2020: EGMO 2020 Staff (Organiser) |
| Vadim | Knyshev | 2015: EGMO 2015 Staff (Organization Committee) |
| Ema | Kobayashi | 2023: United Kingdom (Contestant 2: Silver Medal) |
| Giorgi | Kochiashvili | 2024: EGMO 2024 Staff (Guide: Saudi Arabia) |
| Anett | Kocsis | 2018: Hungary (Contestant 4: Bronze Medal), 2019: Hungary (Contestant 2: Bronze Medal), 2020: Hungary (Contestant 2: Bronze Medal), 2022: EGMO 2022 Staff (Problem Selection, Coordinator), 2025: Hungary (Deputy Leader) |
| Dimitrios | Kodokostas | 2018: Greece (Leader) |
| Blearta | Kodraliu | 2022: Kosovo (Contestant 4) |
| Zarina | Kodyrova | 2025: Ukraine (Deputy Leader) |
| Atsuko | Kogachi | 2019: Japan (Contestant 1: Bronze Medal) |
| Anna | Kokorich | 2023: Switzerland (Contestant 2: Bronze Medal) |
| Tinatin | Kokoshvili | 2018: Georgia (Contestant 2) |
| Maja | Kokot | 2022: Poland (Contestant 2: Silver Medal) |
| Gresilda | Kola | 2018: EGMO 2018 Staff (Guide: Canada, Latvia) |
| Lana | Kolar | 2023: EGMO 2023 Staff (Entertainment) |
| Matej | Kolednik | 2023: EGMO 2023 Staff (Guide: Luxembourg) |
| Yevheniia | Kolesnykova | 2019: EGMO 2019 Staff (Guide: Hungary) |
| Maria Stefania | Koletta | 2025: Greece (Contestant 1) |
| Emil | Kolev | 2012: Bulgaria (Leader), 2013: Bulgaria (Leader), 2014: Bulgaria (Leader), 2015: Bulgaria (Leader), 2016: Bulgaria (Leader), 2017: Bulgaria (Leader), 2018: Bulgaria (Observer with Leader) |
| Sofia | Kollia | 2018: Greece (Contestant 3) |
| Ida | Kolmanić | 2020: Croatia (Contestant 2: Silver Medal) |
| Aleksia | Kolo | 2017: Albania (Contestant 4: Honourable Mention), 2018: Albania (Contestant 2: Honourable Mention), 2019: Albania (Contestant 1: Bronze Medal) |
| Yana | Kolodach | 2020: Ukraine (Contestant 3: Silver Medal) |
| Anja | Komatar | 2012: EGMO 2012 Staff (Invigilator) |
| Milana | Komisarova | 2021: Latvia (Contestant 1), 2022: Latvia (Contestant 1) |
| Boris | Komrakov | 2015: Belarus B (Leader) |
| Hiromasa | Kondo | 2023: Japan (Observer with Leader) |
| Vesa | Konjufca | 2025: EGMO 2025 Staff (Guide: Tunisia) |
| Viola | Konjufca | 2025: EGMO 2025 Staff (Guide: South Africa) |
| Bibigul | Konkayeva | 2019: Kazakhstan (Contestant 1: Bronze Medal), 2020: Kazakhstan (Contestant 1: Silver Medal) |
| Lyuba | Konova | 2017: Bulgaria (Contestant 3: Bronze Medal), 2018: Bulgaria (Contestant 3: Silver Medal), 2019: Bulgaria (Contestant 1: Silver Medal), 2021: Bulgaria (Deputy Leader), 2022: Bulgaria (Leader), 2023: Bulgaria (Leader, EGMO Board), 2024: EGMO 2024 Staff (Problem Selection, Coordinator, EGMO Board), 2025: Bulgaria (Leader, EGMO Board) |
| Johan | Konter | 2020: EGMO 2020 Staff (Chief Coordinator), 2024: Netherlands (Leader), 2025: Netherlands (Deputy Leader) |
| Rebeka Eva | Konute | 2014: Latvia (Contestant 2) |
| Wietze | Koops | 2023: Netherlands (Deputy Leader) |
| Lenka | Kopfová | 2016: Czechia (Contestant 2: Bronze Medal), 2017: Czechia (Contestant 2: Silver Medal), 2018: Czechia (Contestant 1: Silver Medal), 2021: Czechia (Deputy Leader), 2022: Czechia (Deputy Leader) |
| Fatos | Kopliku | 2016: Albania (Leader) |
| Rega | Kopliku | 2014: Albania (Contestant 2) |
| Mayuko | Kori | 2015: Japan (Contestant 2: Bronze Medal) |
| Aleksandre | Korkotashvili | 2024: EGMO 2024 Staff (Coordinator) |
| Tamar | Korkotashvili | 2017: Georgia (Contestant 3: Honourable Mention), 2018: Georgia (Contestant 1: Silver Medal), 2019: Georgia (Contestant 1: Silver Medal), 2020: Georgia (Contestant 2: Silver Medal), 2021: Georgia B (Leader) |
| Solomiia | Korol | 2019: EGMO 2019 Staff (Guide Team Lead) |
| Taisiia | Korotchenko | 2020: Russian Federation (Contestant 4: Gold Medal), 2021: Russian Federation (Contestant 2: Gold Medal) |
| Tetiana | Korotenko | 2019: EGMO 2019 Staff (Guide: Costa Rica) |
| Géza | Kós | 2020: EGMO 2020 Staff (Coordinator), 2022: EGMO 2022 Staff (Problem Selection, Coordinator), 2023: EGMO 2023 Staff (Coordinator) |
| Olívia | Kós | 2022: EGMO 2022 Staff (Guide: United Kingdom) |
| Tjaša | Košenina | 2014: Slovenia (Contestant 3) |
| Wiktoria | Kośny | 2016: Poland (Contestant 1: Silver Medal) |
| Christiana | Kosta | 2020: Cyprus (Contestant 2) |
| Staša | Kostić | 2016: Serbia (Contestant 2) |
| Nina | Kotnik | 2023: EGMO 2023 Staff (Guide: India) |
| Omran | Kouba | 2022: Syria (Leader) |
| Maryam | Kouhkan | 2021: France (Contestant 2: Bronze Medal), 2022: France (Contestant 2: Silver Medal), 2023: France (Contestant 3: Bronze Medal) |
| Varvara | Koulourioti | 2023: Greece (Contestant 1) |
| Petra | Kovačić | 2020: Croatia (Contestant 3: Honourable Mention) |
| Ivana | Kováčová | 2025: Slovakia (Contestant 3) |
| Bence | Kovács | 2022: EGMO 2022 Staff (Guide) |
| Benedek | Kovács | 2022: EGMO 2022 Staff (Coordinator) |
| Péter | Kovács | 2022: EGMO 2022 Staff (Entertainment) |
| Tamás | Kovács | 2022: EGMO 2022 Staff (Guide: Kosovo) |
| Blanka | Kövér | 2022: EGMO 2022 Staff (Guide) |
| Aleksandra | Kowalska | 2018: Poland (Contestant 3: Gold Medal) |
| Karst | Koymans | 2020: EGMO 2020 Staff (Organiser) |
| Pavel | Kozhevnikov | 2016: EGMO 2016 Staff (Problem Selection), 2017: EGMO 2017 Staff (Problem Selection, Coordinator), 2020: EGMO 2020 Staff (Coordinator, Problem Selection) |
| Anik | Kqiku | 2025: EGMO 2025 Staff (Guide) |
| Lucijana | Kračun Berc | 2022: Slovenia (Observer with Leader), 2023: EGMO 2023 Staff (Organiser Chair) |
| Bogdan | Kraincevik | 2016: EGMO 2016 Staff (Guide: United States of America) |
| Lucia | Krajčoviechová | 2019: Slovakia (Contestant 3: Gold Medal), 2020: Slovakia (Contestant 2: Bronze Medal) |
| Samo | Kralj | 2023: EGMO 2023 Staff (Guide: Bangladesh) |
| Nataša | Kramar | 2023: EGMO 2023 Staff (Staff) |
| Valmir | Krasniqi | 2021: Kosovo (Leader), 2022: Kosovo (Deputy Leader) |
| Valon | Krasniqi | 2025: EGMO 2025 Staff (Deputy Chief Guide) |
| Lydia | Kratsa | 2024: Greece (Contestant 2), 2025: Greece (Contestant 2: Honourable Mention) |
| Yuliia | Kravchenko | 2012: Ukraine (Contestant 3: Silver Medal), 2013: Ukraine (Deputy Leader), 2014: Ukraine (Deputy Leader), 2015: Ukraine (Deputy Leader), 2016: Ukraine (Deputy Leader), 2017: Ukraine (Deputy Leader), 2018: Ukraine (Deputy Leader, EGMO AB), 2019: EGMO 2019 Staff (Chief Invigilator, EGMO AB), 2020: Ukraine (Deputy Leader, EGMO AB), 2021: Ukraine (Deputy Leader), 2022: Ukraine (Deputy Leader), 2023: Ukraine (Deputy Leader) |
| Daryna | Kravets | 2013: Ukraine (Contestant 2: Bronze Medal) |
| Tereza | Krejčí | 2023: Czechia (Contestant 4: Honourable Mention) |
| Katherine | Krem | 2012: Bulgaria (Contestant 4) |
| Milja | Krés | 2018: Finland (Contestant 1) |
| Viktória | Krettová | 2025: Slovakia (Contestant 2: Bronze Medal) |
| Galyna | Kriukova | 2012: Ukraine (Leader), 2019: EGMO 2019 Staff (Coordinator) |
| Drilon | Krivaqa | 2025: EGMO 2025 Staff (IT) |
| Daniël | Kroes | 2016: Netherlands (Deputy Leader), 2020: EGMO 2020 Staff (Organiser, Problem Selection) |
| Liv Rosenlund | Krohn | 2021: Denmark (Contestant 3) |
| Zofia | Krok | 2024: Poland (Contestant 1: Honourable Mention) |
| Nevena | Krstevski | 2018: EGMO 2018 Staff (Guide: The former Yugoslav Republic of Macedonia, Serbia) |
| Veranika | Kruhlikava | 2015: EGMO 2015 Staff (Guide: United Kingdom) |
| Yuliya | Kryvitskaya | 2018: Belarus (Contestant 3: Silver Medal), 2019: EGMO 2019 Staff (Coordinator), 2022: EGMO 2022 Staff (Coordinator), 2023: EGMO 2023 Staff (Coordinator), 2024: EGMO 2024 Staff (Coordinator) |
| Tereza | Kubínová | 2025: Czechia (Contestant 1: Honourable Mention) |
| Barbare | Kuchava | 2024: Georgia B (Contestant 4) |
| Anastasiia | Kucherenko | 2014: Ukraine (Contestant 4: Bronze Medal), 2019: EGMO 2019 Staff (Coordinator), 2020: EGMO 2020 Staff (Coordinator) |
| Anatoly | Kuchinsky | 2015: EGMO 2015 Staff (Organization Committee) |
| Aliaksandr | Kuhaida | 2014: Belarus (Observer with Leader), 2015: EGMO 2015 Staff (IT) |
| Jonas | Kühne | 2015: Switzerland (Deputy Leader), 2016: Switzerland (Observer with Leader), 2017: EGMO 2017 Staff (Organizing Committee) |
| Simona | Kukova | 2016: Bulgaria (Contestant 3: Bronze Medal), 2017: Bulgaria (Contestant 4: Bronze Medal), 2018: Bulgaria (Contestant 1: Bronze Medal) |
| Aliaksandra | Kukuts | 2015: EGMO 2015 Staff (Guide) |
| Boglárka | Kulcsár | 2022: EGMO 2022 Staff (Guide: Ukraine) |
| Katja | Kulmala | 2012: Finland (Contestant 2), 2013: Finland (Contestant 2: Honourable Mention) |
| Shinoa | Kumamoto | 2022: Japan (Contestant 1: Honourable Mention) |
| Špela | Kumer | 2023: EGMO 2023 Staff (Media) |
| Lucie | Kundratová | 2018: Czechia (Contestant 2: Honourable Mention) |
| Almaz | Kungozhin | 2017: Kazakhstan (Leader), 2018: Kazakhstan (Leader), 2019: Kazakhstan (Leader), 2020: Kazakhstan (Leader), 2021: Kazakhstan (Leader) |
| Medeubek | Kungozhin | 2024: Kazakhstan (Leader), 2025: Kazakhstan (Leader) |
| Dávid | Kunszenti-Kovács | 2013: Norway (Leader), 2014: Norway (Leader), 2015: Norway (Leader), 2016: Norway (Leader), 2017: Norway (Leader), 2022: EGMO 2022 Staff (Chief Coordinator, Problem Selection) |
| Katsiaryna | Kunts | 2015: Belarus (Contestant 1: Bronze Medal), 2016: Belarus (Contestant 2: Bronze Medal) |
| Labinot | Kunushevci | 2025: EGMO 2025 Staff (Deputy Chief Guide) |
| Rusudani | Kupatadze | 2024: Georgia B (Contestant 1) |
| Sophia | Kurbatova | 2019: Israel (Contestant 2: Honourable Mention) |
| Anastasiia | Kurchenko | 2019: EGMO 2019 Staff (Guide: Cyprus) |
| Esmael | Kurdi | 2017: Saudi Arabia (Observer with Contestants) |
| Manar | Kurdi | 2017: Saudi Arabia (Contestant 4: Honourable Mention) |
| Amar | Kurić | 2024: Bosnia and Herzegovina (Leader) |
| Eriko | Kurimoto | 2014: Japan (Contestant 2: Silver Medal) |
| Naoki | Kuroda | 2023: Japan (Observer with Leader) |
| Süreyya Emre | Kurt | 2014: EGMO 2014 Staff (Coordinator) |
| Bardha | Kurtishi | 2025: Kosovo B (Contestant 2) |
| Neira | Kurtović | 2016: Bosnia and Herzegovina (Contestant 1: Silver Medal) |
| Máté | Kurucz | 2022: EGMO 2022 Staff (Guide: Croatia) |
| Yuliya | Kurylenka | 2017: Belarus (Contestant 1: Bronze Medal) |
| Ágnes | Kúsz | 2013: Hungary (Contestant 1: Bronze Medal), 2014: Hungary (Contestant 2: Silver Medal) |
| Mariam | Kutaladze | 2024: EGMO 2024 Staff (Guide: France) |
| Lizi | Kutchava | 2021: Georgia B (Contestant 1), 2022: Georgia (Contestant 2: Honourable Mention), 2023: Georgia (Contestant 4: Honourable Mention), 2024: EGMO 2024 Staff (Treasurer) |
| Klavdija | Kutnar | 2023: EGMO 2023 Staff (Organiser Vice Chair) |
| Idaliina | Kuusisto | 2019: Finland (Contestant 1), 2020: Finland (Contestant 2) |
| Yuka | Kuwahara | 2018: Japan (Contestant 2), 2019: Japan (Contestant 2: Bronze Medal) |
| Bojan | Kuzma | 2023: EGMO 2023 Staff (Coordinator) |
| Boštjan | Kuzman | 2023: EGMO 2023 Staff (Staff) |
| Varvara | Kuzmitskaya | 2013: Belarus (Contestant 3: Gold Medal), 2014: Belarus (Contestant 2: Bronze Medal) |
| Agata | Kuzņecova | 2022: Latvia (Contestant 3: Honourable Mention) |
| Yaroslava | Kuznetska | 2019: EGMO 2019 Staff (Guide: Ukraine) |
| Tekla | Kvernadze | 2024: EGMO 2024 Staff (Guide: Canada) |
| Keisha | Kwok | 2024: United Kingdom (Contestant 3) |
| Alexandra Caroline Kähler | Kyed | 2024: Denmark (Contestant 2), 2025: Denmark (Contestant 1) |
| Angelina | Kysil | 2018: Luxembourg (Contestant 2), 2019: Luxembourg (Contestant 2: Honourable Mention), 2020: Luxembourg (Contestant 3: Honourable Mention), 2021: Luxembourg (Contestant 2) |
| Lisa | Labatut | 2023: Luxembourg (Contestant 2) |
| Noga | Labin | 2022: Israel (Contestant 4: Bronze Medal) |
| Tanja | Labus | 2022: Slovenia (Observer with Deputy), 2023: EGMO 2023 Staff (Organiser) |
| Phil | Labuschagne | 2025: South Africa (Deputy Leader) |
| Shanta Singh | Laishram | 2019: India (Deputy Leader) |
| Kálmán | Lajkó | 2022: EGMO 2022 Staff (Coordinator) |
| Camille | Laloux | 2020: Belgium (Contestant 4), 2021: Belgium (Contestant 4) |
| Thelma | Lambert | 2018: Belgium (Contestant 3) |
| Nina | Lameva | 2024: North Macedonia (Contestant 4) |
| Taslima Tasnim | Lamia | 2025: Bangladesh (Contestant 3: Honourable Mention) |
| Yuqi | Lan | 2025: People's Republic of China (Contestant 2: Gold Medal) |
| Kirsten | Land | 2015: United Kingdom (Contestant 3: Honourable Mention) |
| Xiaoping | Lang | 2021: Ireland (Contestant 1) |
| Irina | Lanskikh | 2018: Russian Federation (Contestant 2: Gold Medal) |
| Mikita | Lappo | 2014: Belarus (Observer with Leader), 2015: EGMO 2015 Staff (IT) |
| Selma | Larinouna | 2024: Algeria (Contestant 1) |
| Daniel | Lasaosa Medarde | 2017: Spain (Deputy Leader), 2018: Spain (Deputy Leader), 2019: Spain (Deputy Leader), 2020: Spain (Deputy Leader), 2021: Spain (Deputy Leader) |
| Agata | Latacz | 2012: Poland (Contestant 1: Silver Medal) |
| Nikolė | Lavrik | 2022: Lithuania (Contestant 3), 2023: Lithuania (Contestant 3), 2024: Lithuania (Contestant 3) |
| Vera | Lavrova | 2023: Germany (Contestant 3: Gold Medal), 2024: Germany (Contestant 3: Gold Medal) |
| Stacey | Law | 2012: EGMO 2012 Staff (Invigilator) |
| Cristian | Lazăr | 2016: EGMO 2016 Staff (Coordinator) |
| Vinh | Le Anh | 2016: Saudi Arabia (Observer with Leader) |
| Samira | le Grand | 2021: Belgium (Deputy Leader) |
| Viviana | Le Roy Cáceres | 2021: Costa Rica (Contestant 2) |
| Imre | Leader | 2012: EGMO 2012 Staff (Chief Coordinator) |
| Waltraud | Lederle | 2017: EGMO 2017 Staff (Coordinator) |
| Elizabeth | Lee | 2012: United Kingdom (Contestant 2), 2013: United Kingdom (Contestant 2: Silver Medal) |
| Jonathan | Lee | 2012: EGMO 2012 Staff (Coordinator) |
| Vanneshia Swiegl | Lee | 2020: Indonesia (Contestant 3) |
| Yunwoo | Lee | 2012: Ireland (Contestant 2: Honourable Mention) |
| Anna | Leeb | 2022: Germany (Contestant 2: Bronze Medal) |
| Laureline | Legros | 2018: France (Contestant 2: Bronze Medal) |
| Tariq | Leinen | 2017: EGMO 2017 Staff (Invigilator, Staff) |
| Ekaterina | Leksina | 2024: Spain (Contestant 1: Honourable Mention) |
| Larissa | Lemos Afonso | 2022: Brazil (Contestant 4) |
| Dániel | Lenger | 2022: EGMO 2022 Staff (Invigilator, Coordinator) |
| Ádám | Lengyel | 2022: EGMO 2022 Staff (Guide: Czechia) |
| Letícia | Lengyel | 2022: EGMO 2022 Staff (Entertainment) |
| Théo | Lenoir | 2025: EGMO 2025 Staff (Coordinator) |
| Anna | Lenz | 2020: Austria (Contestant 1) |
| Charlotte | Léonard | 2016: Belgium (Contestant 3), 2017: Belgium (Contestant 3: Honourable Mention) |
| Stefan | Leopoldseder | 2019: Austria (Leader) |
| Enya | Leroy | 2023: Belgium (Contestant 3: Honourable Mention), 2024: Belgium (Contestant 3: Honourable Mention), 2025: Belgium (Contestant 4: Silver Medal) |
| Bogdan | Leşan | 2016: EGMO 2016 Staff (Guide: Russian Federation) |
| Stefano | Leucci | 2017: EGMO 2017 Staff (Staff) |
| Yuliya | Leukavets | 2015: EGMO 2015 Staff (Guide: Saudi Arabia) |
| Gerry | Leversha | 2012: EGMO 2012 Staff (Coordinator) |
| Neringa | Levinskaitė | 2015: Lithuania (Contestant 4: Silver Medal), 2017: Lithuania (Contestant 3: Bronze Medal), 2018: Lithuania (Contestant 3: Gold Medal) |
| Christophe | Ley | 2013: EGMO 2013 Staff (Chief Coordinator) |
| Elza | Leyenaar | 2020: EGMO 2020 Staff (Organiser) |
| Charles | Leytem | 2013: EGMO 2013 Staff (Problem Selection Chair, EGMO AB, Jury Chair), 2014: EGMO 2014 Staff (EGMO AB, Coordinator), 2015: EGMO 2015 Staff (EGMO AB, Coordinator), 2016: EGMO 2016 Staff (EGMO AB, Coordinator), 2017: EGMO 2017 Staff (Coordinator, EGMO AB), 2018: EGMO 2018 Staff (EGMO AB), 2019: EGMO 2019 Staff (Coordinator), 2022: EGMO 2022 Staff (Problem Selection) |
| Amber | Li | 2024: Australia (Contestant 1: Gold Medal), 2025: Australia (Contestant 4: Gold Medal) |
| Charles | Li | 2023: Australia (Observer with Deputy), 2024: Australia (Observer with Leader) |
| Ellen | Li | 2020: Ireland (Contestant 3: Bronze Medal), 2021: Ireland (Contestant 2) |
| Lucy | Li | 2023: EGMO 2023 Staff (Sponsor) |
| Ruirong | Li | 2024: France (Contestant 2: Bronze Medal), 2025: France (Contestant 2: Gold Medal) |
| Samantha | Li | 2020: Netherlands (Contestant 1), 2021: Netherlands (Contestant 2) |
| Sharon | Li | 2012: EGMO 2012 Staff (Guide: Ukraine, United States of America) |
| Wanlin | Li | 2017: United States of America (Contestant 4: Gold Medal), 2018: United States of America (Contestant 2: Gold Medal), 2020: EGMO 2020 Staff (Problem Selection) |
| Yuhan | Li | 2024: People's Republic of China (Contestant 4: Gold Medal) |
| Albina | Lialina | 2016: Russian Federation (Contestant 1: Gold Medal) |
| Xiang | Lian | 2023: Ireland (Contestant 2: Honourable Mention) |
| Celine | Liang | 2015: United States of America (Contestant 2: Gold Medal), 2016: United States of America (Contestant 1: Silver Medal) |
| Jingzhi | Liang | 2018: Canada (Contestant 3: Bronze Medal) |
| Lena | Libort | 2023: Switzerland (Contestant 3: Honourable Mention) |
| Luka | Liklikadze | 2024: EGMO 2024 Staff (Chief Guide: Norway) |
| Mariam | Liklikadze | 2024: EGMO 2024 Staff (Guide: India) |
| Glen | Lim | 2025: EGMO 2025 Staff (Coordinator) |
| Elsa | Lin | 2023: United Kingdom (Contestant 3: Bronze Medal), 2024: United Kingdom (Contestant 2: Silver Medal) |
| Jingran | Lin | 2013: EGMO 2013 Staff (Problem Selection, Coordinator) |
| Yen-chi Roger | Lin | 2023: Taiwan (Observer with Leader), 2024: Taiwan (Leader), 2025: Taiwan (Deputy Leader) |
| Yun-chen | LIN | 2024: Taiwan (Contestant 2: Silver Medal), 2025: Taiwan (Contestant 2: Bronze Medal) |
| Friso | Linda | 2016: Italy (Contestant 1), 2017: Italy (Contestant 1: Honourable Mention), 2018: Italy (Contestant 3: Bronze Medal), 2023: Italy (Deputy Leader) |
| Enya | Lindekens | 2023: Belgium (Contestant 4), 2024: Belgium (Contestant 4) |
| Sofia | Lindqvist | 2015: Norway (Deputy Leader), 2016: Norway (Deputy Leader), 2017: Norway (Deputy Leader), 2018: Norway (Leader), 2019: Norway (Leader), 2020: Norway (Leader), 2021: Norway (Leader), 2022: Norway (Leader), 2023: Norway (Leader), 2024: Norway (Leader) |
| Lovise Foss | Linnestad | 2024: Norway (Contestant 3), 2025: Norway (Contestant 2: Honourable Mention) |
| Klevis | Liperi | 2025: EGMO 2025 Staff (Coordinator) |
| Yll | Lipovica | 2025: EGMO 2025 Staff (Guide: Italy) |
| Nicole | Lipschitz Kesselman | 2020: Costa Rica (Contestant 3: Honourable Mention), 2021: Costa Rica (Contestant 3), 2022: Costa Rica (Contestant 3: Bronze Medal) |
| Jacqueline | Lira-Chávez | 2016: Mexico (Contestant 4) |
| Vitalii | Lishunov | 2019: EGMO 2019 Staff (Problem Selection, Coordinator) |
| Angela | Liu | 2024: United States of America (Contestant 3: Gold Medal), 2025: United States of America (Contestant 4: Gold Medal) |
| Chia-yi | Liu | 2024: Taiwan (Contestant 3: Bronze Medal) |
| Elaine | Liu | 2019: Canada (Contestant 3: Bronze Medal), 2020: Canada (Contestant 1: Honourable Mention) |
| Katrina | Liu | 2024: Canada (Contestant 2: Silver Medal) |
| Roberta | Liu | 2018: EGMO 2018 Staff (Guide: Georgia) |
| Yankuan | Liu | 2025: People's Republic of China (Contestant 3: Gold Medal) |
| Libi | Liubovich | 2018: Israel (Contestant 2: Silver Medal) |
| Viktoriia | Liudvik | 2019: EGMO 2019 Staff (Guide: Romania) |
| Rea | Llapashtica | 2025: EGMO 2025 Staff (Guide: India) |
| Blerina | Lleshi | 2018: EGMO 2018 Staff (Guide: Tunisia) |
| Anastasia | Lobzhanidze | 2024: EGMO 2024 Staff (Guide: Germany) |
| Katarina | Lodrant | 2023: EGMO 2023 Staff (Guide) |
| Ine Sofie | Lodsby | 2019: Norway (Contestant 2) |
| Kari Lovise | Lodsby | 2013: Norway (Contestant 2), 2014: Norway (Contestant 3: Bronze Medal), 2015: Norway (Contestant 1) |
| Tina | Logonder | 2023: EGMO 2023 Staff (Guide: United Kingdom) |
| Vivian | Loh | 2022: United States of America (Contestant 4: Gold Medal), 2023: United States of America (Contestant 4: Gold Medal) |
| Sotiris | Loizias | 2021: Cyprus (Observer with Deputy) |
| Martina | Lokar | 2015: Slovenia (Contestant 2) |
| Evangelia | Loli | 2018: Greece (Deputy Leader), 2019: Greece (Deputy Leader), 2020: Greece (Deputy Leader) |
| Davide | Lombardo | 2018: EGMO 2018 Staff (Problem Selection) |
| Jelle | Loois | 2020: EGMO 2020 Staff (Organiser) |
| Cynthia Naely | López Estrada | 2022: Mexico (Contestant 3: Silver Medal) |
| Milan | Lopuhaä-Zwakenberg | 2015: Netherlands (Deputy Leader), 2020: EGMO 2020 Staff (Organiser) |
| Isabela | Loredo Carvajal | 2024: Mexico (Contestant 4: Honourable Mention) |
| Weronika | Lorenczyk | 2018: Poland (Contestant 4: Silver Medal) |
| Christa | Lorenzia Soesanto | 2012: Indonesia (Contestant 1: Silver Medal) |
| Elisa | Lorenzo García | 2016: Spain (Deputy Leader), 2018: Spain (Leader), 2019: Spain (Leader, EGMO AB, Problem Selection), 2020: Spain (Leader, EGMO AB), 2021: Spain (Leader, EGMO AB), 2022: Spain (Leader, EGMO Board), 2023: Spain (Leader), 2024: EGMO 2024 Staff (Problem Selection, Coordinator), 2025: Spain (Leader) |
| Míriam | Lorenzo Laguno | 2018: Spain (Contestant 3: Bronze Medal), 2019: Spain (Contestant 1) |
| Jimena | Lorenzo Simón | 2021: Spain (Contestant 2) |
| Maaike | Los | 2013: Netherlands (Contestant 3: Honourable Mention) |
| Maria | Losada | 2023: Colombia (Leader) |
| Tom | Lovering | 2012: EGMO 2012 Staff (Coordinator) |
| Elsa | Lubek | 2020: France (Contestant 1: Bronze Medal), 2025: France (Deputy Leader) |
| Dora | Lubishtani | 2022: Kosovo (Contestant 3), 2023: Kosovo (Contestant 1), 2024: Kosovo (Contestant 1), 2025: EGMO 2025 Staff (Guide: Taiwan) |
| Iryna | Lubyshkina | 2019: EGMO 2019 Staff (Guide: Mexico) |
| Anna | Luchnikova | 2018: France (Contestant 3: Silver Medal), 2019: France (Contestant 2: Silver Medal), 2020: France (Contestant 2: Silver Medal), 2021: France (Deputy Leader), 2022: France (Leader), 2023: France (Leader), 2024: France (Leader), 2025: France (Observer with Leader) |
| Ana | Luetić | 2023: EGMO 2023 Staff (Guide: Poland) |
| Seli | Lulaj | 2017: Albania (Contestant 2), 2018: Albania (Contestant 1: Honourable Mention), 2019: Albania (Contestant 3: Honourable Mention) |
| Flor | Luna | 2020: Peru (Contestant 2: Silver Medal), 2021: Peru (Contestant 3: Gold Medal), 2022: Peru (Contestant 2: Gold Medal) |
| Laura | Lung | 2022: EGMO 2022 Staff (Guide: Italy) |
| Yihua | Luo | 2019: United Kingdom (Contestant 3: Silver Medal) |
| Rinesa | Lushtaku | 2025: EGMO 2025 Staff (Guide: Peru) |
| Floortje | Lusthof | 2025: Netherlands (Contestant 3: Bronze Medal) |
| Melina | Lüthi | 2015: Switzerland (Contestant 2) |
| Darya | Lutskevich | 2015: EGMO 2015 Staff (Guide: Lithuania, Latvia) |
| Florije | Luzha | 2025: EGMO 2025 Staff (Guide: Kosovo) |
| Anastasiia | Lysakevych | 2022: Ukraine (Observer with Leader) |
| Anna | Lyubarskaja | 2015: Norway (Contestant 2: Honourable Mention), 2016: Norway (Contestant 1: Bronze Medal), 2017: Norway (Contestant 1: Bronze Medal), 2018: Norway (Contestant 2: Bronze Medal) |
| Rakshan | Lyutfi Redzheb | 2014: EGMO 2014 Staff (Guide: Netherlands) |
| Łucja | Łyziak | 2025: Poland (Contestant 4: Gold Medal) |
| Dana | Ma | 2012: EGMO 2012 Staff (Guide: Latvia, Serbia), 2019: Australia (Observer with Deputy), 2023: Australia (Deputy Leader) |
| Emily | Ma | 2024: Canada (Contestant 1: Silver Medal) |
| Lucía de Fang | Ma Li | 2016: Spain (Contestant 3) |
| Eliška | Macáková | 2021: Slovakia (Contestant 3: Silver Medal), 2022: Slovakia (Contestant 4: Silver Medal), 2023: Slovakia (Contestant 4: Gold Medal), 2024: Slovakia (Contestant 4: Gold Medal) |
| Luca | Macchiaroli | 2018: EGMO 2018 Staff (Coordinator) |
| Eleanor | MacGillivray | 2021: United Kingdom (Contestant 2: Silver Medal), 2022: United Kingdom (Contestant 4: Gold Medal) |
| Akaki | Macharashvili | 2024: EGMO 2024 Staff (Coordinator) |
| Yuka | Machino | 2019: United Kingdom (Contestant 4: Gold Medal), 2020: United Kingdom (Contestant 4: Gold Medal), 2021: United Kingdom (Contestant 3: Gold Medal) |
| Manon | Mackels | 2014: Belgium (Contestant 4), 2015: Belgium (Contestant 4) |
| Anja | MacKenzie | 2024: Ireland (Contestant 4) |
| Nistor-Marin | Mădălina | 2016: EGMO 2016 Staff (Invigilator) |
| Yoshiaki | Maeda | 2025: Japan (Observer with Deputy) |
| Péter | Maga | 2022: EGMO 2022 Staff (Coordinator) |
| Andreea | Măgălie | 2012: Romania (Contestant 2: Silver Medal), 2013: Romania (Contestant 2: Silver Medal), 2014: Romania (Contestant 2: Gold Medal) |
| Alice | Magnanini | 2022: Italy (Contestant 3: Bronze Medal) |
| Ayushi | Mahajan | 2022: Ireland (Contestant 2), 2023: Ireland (Contestant 1: Honourable Mention) |
| Bana | Mahana | 2022: Syria (Contestant 1: Honourable Mention) |
| Tojinisso | Mahmadova | 2022: Tajikistan (Leader) |
| Sevinj | Mahmudova | 2022: Azerbaijan (Contestant 4: Honourable Mention), 2023: Azerbaijan (Contestant 2: Bronze Medal), 2024: Azerbaijan (Contestant 2: Bronze Medal) |
| Nicoleta | Mahu | 2014: Republic of Moldova (Contestant 1), 2015: Republic of Moldova (Contestant 1: Bronze Medal) |
| Marius | Mâinea | 2016: EGMO 2016 Staff (Coordinator) |
| Lissette | Maingón | 2016: Ecuador (Contestant 4) |
| Suzanne | Mairesse | 2020: France (Contestant 3: Silver Medal) |
| Mariana | Makara | 2019: EGMO 2019 Staff (Guide: Latvia) |
| Ana | Makharadze | 2022: Georgia (Contestant 3) |
| Dildora | Makhkamova | 2025: Uzbekistan (Contestant 1: Silver Medal) |
| Danae | Makridou | 2021: Cyprus (Contestant 3), 2022: Cyprus (Contestant 3: Bronze Medal) |
| Anastasia | Maksimenko | 2024: EGMO 2024 Staff (Guide: Australia) |
| Alekso | Malcheski | 2015: The former Yugoslav Republic of Macedonia (Leader), 2016: The former Yugoslav Republic of Macedonia (Leader), 2017: The former Yugoslav Republic of Macedonia (Leader), 2018: The former Yugoslav Republic of Macedonia (Deputy Leader), 2019: North Macedonia (Deputy Leader) |
| Eugenia | Malinnikova | 2013: Norway (Deputy Leader) |
| Dina | Maliqi | 2025: Kosovo B (Contestant 3) |
| Daria | Maliuha | 2019: EGMO 2019 Staff (Guide: Norway) |
| Lucía | Mallo Fernández | 2016: Spain (Contestant 4), 2017: Spain (Contestant 2), 2024: Spain (Deputy Leader), 2025: Spain (Deputy Leader) |
| Akaki | Mamageishvili | 2017: EGMO 2017 Staff (Invigilator) |
| Mariam | Mamageishvili | 2024: EGMO 2024 Staff (Guide: Ukraine) |
| Tekla | Mamageishvili | 2024: EGMO 2024 Staff (Guide: Czechia) |
| Tinatin | Mamageishvili | 2017: EGMO 2017 Staff (Guide: Georgia) |
| Cătălina | Mămăligă | 2014: Republic of Moldova (Contestant 4) |
| Dalia | Mamani | 2022: Bolivia (Contestant 4) |
| Saikal | Mamarasulova | 2025: Kyrgyzstan (Contestant 1: Honourable Mention) |
| Marcello | Mamino | 2018: EGMO 2018 Staff (Problem Selection) |
| Abbas | Mammadov | 2021: Azerbaijan (Deputy Leader) |
| Sayalı | Mammadova | 2016: Azerbaijan (Contestant 4) |
| Bakyt | Mamyshev | 2022: Kazakhstan (Leader) |
| Rana | Mandorah | 2020: Saudi Arabia (Observer with Contestants) |
| Cristian | Mangra | 2016: EGMO 2016 Staff (Coordinator) |
| Hana | Mani | 2025: EGMO 2025 Staff (Guide: Germany) |
| Irene | Maniglia | 2019: Italy (Contestant 3: Honourable Mention), 2020: Italy (Contestant 2: Honourable Mention) |
| Andria | Manjavidze | 2024: EGMO 2024 Staff (Coordinator) |
| Maryia | Mankevich | 2015: EGMO 2015 Staff (Coordinator) |
| Declan | Manning | 2019: Ireland (Deputy Leader) |
| Myrto | Manolaki | 2021: Ireland (Deputy Leader), 2023: Ireland (Deputy Leader), 2025: Ireland (Leader) |
| Ifigeneia | Manolou | 2025: Greece (Contestant 3) |
| Iulia | Manta | 2016: EGMO 2016 Staff (Guide: Azerbaijan) |
| Lizaveta | Manzhulina | 2015: Belarus (Contestant 2: Bronze Medal), 2016: Belarus (Contestant 1: Silver Medal), 2019: EGMO 2019 Staff (Coordinator) |
| Nina | Marčeta | 2023: EGMO 2023 Staff (Guide: Croatia) |
| Lissette | Marchandon Figueroa | 2020: Chile (Contestant 2: Honourable Mention) |
| Ralitsa | Marcheva | 2024: Bulgaria (Contestant 4) |
| Claudia | Marchitan | 2016: EGMO 2016 Staff (Staff) |
| Arnaud | Maret | 2017: EGMO 2017 Staff (Coordinator), 2023: EGMO 2023 Staff (Coordinator) |
| Mila | Maretić | 2024: Croatia (Contestant 2: Silver Medal), 2025: Croatia (Contestant 3: Bronze Medal) |
| Gabriela Erin | Mariangel | 2020: Indonesia (Contestant 1: Bronze Medal) |
| Teresa | Marín Marín | 2020: Spain (Contestant 1) |
| Dan | Marinescu | 2016: EGMO 2016 Staff (Coordinator) |
| Gabriela | Marinescu | 2016: EGMO 2016 Staff (Invigilator) |
| Miroslav | Marinov | 2024: EGMO 2024 Staff (Coordinator), 2025: EGMO 2025 Staff (Coordinator) |
| Iva | Marinšek | 2023: EGMO 2023 Staff (Entertainment) |
| Marijana | Marinšek | 2023: EGMO 2023 Staff (Staff) |
| Angelika | Markaj | 2017: EGMO 2017 Staff (Guide: Azerbaijan) |
| Denitsa | Markova | 2014: Bulgaria (Contestant 2: Silver Medal), 2015: Bulgaria (Contestant 1: Silver Medal), 2016: Bulgaria (Contestant 1: Silver Medal), 2019: Bulgaria (Leader) |
| Ralitsa | Markova | 2017: EGMO 2017 Staff (Guide: Switzerland, Switzerland B) |
| Oleksandr | Markovichenko | 2019: EGMO 2019 Staff (Coordinator) |
| Marigona | Marku | 2022: Kosovo (Contestant 2), 2025: EGMO 2025 Staff (Guide: Albania) |
| Marija Dora | Marodi | 2023: Croatia (Contestant 3: Silver Medal) |
| Shukufa | Marodmamadova | 2022: Tajikistan (Deputy Leader) |
| Katsiaryna | Maroz | 2017: Belarus (Contestant 4: Bronze Medal), 2018: Belarus (Contestant 4) |
| Lizi | Marsagishvili | 2024: EGMO 2024 Staff (Chief Guide: Ireland) |
| Andrea | Martin | 2018: EGMO 2018 Staff (Guide: Cyprus, Greece) |
| Monica | Martinez | 2018: Peru (Contestant 2: Gold Medal), 2019: Peru (Contestant 1: Silver Medal), 2021: Peru (Observer with Leader), 2022: Peru (Deputy Leader), 2023: EGMO 2023 Staff (Coordinator), 2025: Peru (Deputy Leader) |
| Marisel | Martínez | 2022: Bolivia (Contestant 2) |
| Violeta Alitzel | Martínez Escamilla | 2018: Mexico (Contestant 2: Silver Medal) |
| Mireia | Martínez i Sellarès | 2020: EGMO 2020 Staff (Organiser) |
| Olha | Marunchak | 2019: EGMO 2019 Staff (Guide: Luxembourg) |
| Esma | Mašić | 2019: Bosnia and Herzegovina (Contestant 4: Bronze Medal), 2020: Bosnia and Herzegovina (Contestant 1: Bronze Medal), 2021: Bosnia and Herzegovina (Contestant 2: Silver Medal) |
| Naomi | Mastache López | 2015: Mexico (Contestant 4: Bronze Medal) |
| Brigita | Mastnak | 2023: EGMO 2023 Staff (Chief Invigilator, Senior Guide) |
| Ayune | Masutani | 2025: Japan (Contestant 3: Honourable Mention) |
| Guram | Matcharashvili | 2024: EGMO 2024 Staff (Coordinator) |
| Kyriacos | Matheou | 2021: Cyprus (Observer with Leader) |
| Nina | Matić | 2018: Serbia (Contestant 4: Honourable Mention) |
| Dávid | Matolcsi | 2022: EGMO 2022 Staff (Problem Selection, Coordinator) |
| Ruka | Matsubara | 2014: Japan (Observer with Contestants) |
| Eve | Mattatia | 2016: France (Contestant 2) |
| Melanie | Mattersberger | 2021: Austria (Contestant 1) |
| Maria Sophie | Matthis | 2019: Germany (Contestant 2: Honourable Mention), 2020: Germany (Contestant 2: Silver Medal) |
| Marie | Mattutat | 2021: Germany (Contestant 3) |
| Maria | Matveev | 2018: EGMO 2018 Staff (Guide: Belarus, Lithuania) |
| Ariane | Maurer | 2017: EGMO 2017 Staff (Invigilator, Staff) |
| Mateja | Mavrič | 2023: EGMO 2023 Staff (Guide: Italy) |
| Finesë | Maxhuni | 2025: EGMO 2025 Staff (Guide: Brazil) |
| Rrap | Maxhuni | 2025: EGMO 2025 Staff (Guide: Latvia) |
| Tonila | Maxhuni | 2025: EGMO 2025 Staff (Guide: Japan) |
| Martha Sofia | Mayo | 2024: Italy (Contestant 4: Honourable Mention) |
| Sergei | Mazanik | 2015: EGMO 2015 Staff (Jury Chair, EGMO AB) |
| Péter | Mazug | 2022: EGMO 2022 Staff (Guide: North Macedonia) |
| Siobhan | Mc Gale | 2025: Ireland (Contestant 1: Bronze Medal) |
| Ashling | McCarthy | 2021: Ireland (Contestant 3) |
| Janine | McIntosh | 2017: EGMO 2017 Staff (Observer) |
| Lucy | McMahon | 2012: EGMO 2012 Staff (Guide: Italy, Luxembourg) |
| Wissal | Mechri | 2024: Algeria (Contestant 2) |
| Olga | Medrano-Martin del Campo | 2014: Mexico (Contestant 2: Bronze Medal), 2015: Mexico (Contestant 2: Bronze Medal), 2016: Mexico (Contestant 1: Gold Medal) |
| Amal | Meer | 2015: Saudi Arabia (Contestant 3: Honourable Mention) |
| Arjola | Mehmeti | 2020: Albania (Contestant 3: Honourable Mention) |
| Diamant | Mehmeti | 2025: EGMO 2025 Staff (Guide: Australia) |
| Robert | Meier | 2017: Liechtenstein (Leader) |
| Lisa | Meij | 2025: Netherlands (Contestant 4: Bronze Medal) |
| Florine | Meijer | 2020: EGMO 2020 Staff (Crew) |
| Malthe David Søholm | Mejlsted | 2023: Denmark (Deputy Leader) |
| Ana Maria | Mekerishvili | 2019: Netherlands (Contestant 2: Honourable Mention), 2020: Netherlands (Contestant 2: Bronze Medal) |
| Luka | Meladze | 2024: EGMO 2024 Staff (Coordinator) |
| Martin | Melicher | 2024: Slovakia (Deputy Leader) |
| Aleksandras | Melnik | 2025: Lithuania (Leader) |
| David | Memarnishvili | 2024: EGMO 2024 Staff (Jury Chair) |
| Taghreed | Memish | 2018: Saudi Arabia (Observer with Contestants), 2019: Saudi Arabia (Observer with Contestants) |
| Lea | Menasce | 2016: Luxembourg (Contestant 2), 2017: Luxembourg (Contestant 3), 2018: Luxembourg (Contestant 1) |
| Sandra Berenice | Mendoza Penunuri | 2014: Mexico (Contestant 4) |
| Hongjia | Meng | 2024: Switzerland (Contestant 2: Bronze Medal), 2025: Switzerland (Contestant 3: Gold Medal) |
| Yuxuan | Meng | 2025: People's Republic of China (Contestant 4: Gold Medal) |
| Veronika | Menšíková | 2024: Czechia (Contestant 3: Bronze Medal), 2025: Czechia (Contestant 2: Silver Medal) |
| Özge | Mercanoğlu | 2014: EGMO 2014 Staff (Guide, TÜBİTAK) |
| Mathieu | Meriaux | 2020: Australia (Observer with Contestants) |
| Evelyn | Merkli | 2017: EGMO 2017 Staff (Media) |
| Florian | Merkli | 2017: EGMO 2017 Staff (Media) |
| Magnus Christian Ring | Merrild | 2022: Denmark (Deputy Leader) |
| Brena | Merz | 2025: New Zealand (Deputy Leader) |
| David | Mestel | 2012: EGMO 2012 Staff (Coordinator) |
| Anna | Mészáros | 2019: Hungary (Contestant 4: Bronze Medal) |
| Anna | Mészáros | 2022: EGMO 2022 Staff (Guide: Spain) |
| Nea | Metohu | 2022: Albania (Contestant 4), 2023: Albania (Contestant 1: Honourable Mention) |
| Christina | Meyer | 2012: Luxembourg (Contestant 1: Bronze Medal), 2013: Luxembourg (Contestant 1: Honourable Mention), 2014: Luxembourg (Contestant 1: Bronze Medal) |
| Julien | Meyer | 2013: EGMO 2013 Staff (Coordinator) |
| Eya | Mghaieth | 2025: Tunisia (Contestant 1) |
| Sahil Shrikant | Mhaskar | 2018: India (Deputy Leader), 2024: India (Leader) |
| Ella | Mi | 2012: United Kingdom (Contestant 3) |
| Renate Lorena | Midtgård | 2025: Norway (Contestant 3: Honourable Mention) |
| Kotryna | Mieldažytė | 2025: Lithuania (Contestant 3: Honourable Mention) |
| Pasquale | Miglionico | 2018: EGMO 2018 Staff (Guide: Norway) |
| Matteo | Migliorini | 2018: EGMO 2018 Staff (Coordinator) |
| Marija | Mihajlović | 2022: Serbia (Contestant 3: Honourable Mention) |
| Mite | Mijalkov | 2014: EGMO 2014 Staff (Guide: Serbia) |
| Mariia | Mikhnovska | 2022: Ukraine (Contestant 4: Bronze Medal) |
| Tjaša | Miklavčič | 2023: EGMO 2023 Staff (Guide: Cyprus) |
| Csenge | Miklós | 2022: EGMO 2022 Staff (Guide: Romania) |
| Jon | Mikoš | 2023: EGMO 2023 Staff (Guide) |
| Attila | Mikulán | 2022: EGMO 2022 Staff (Entertainment) |
| Anna | Mikulevica | 2020: Latvia (Contestant 2) |
| Lana | Milani | 2022: Croatia (Contestant 2: Honourable Mention), 2025: Croatia (Contestant 4: Silver Medal) |
| Ugnė | Milašiūnaitė | 2019: Lithuania (Contestant 2: Bronze Medal) |
| Tim Samuel | Milčevski | 2023: EGMO 2023 Staff (Entertainment) |
| Cecília | Mileski de Paula | 2022: Brazil (Contestant 1: Bronze Medal), 2023: Brazil (Contestant 1: Bronze Medal) |
| Zlatina | Mileva | 2017: Bulgaria (Contestant 1: Honourable Mention) |
| Eirini | Miliori | 2018: Greece (Contestant 1: Bronze Medal), 2019: Greece (Contestant 2: Bronze Medal) |
| Kanella Georgia | Minakaki | 2017: Switzerland B (Contestant 1) |
| Linka | Mincheva | 2015: Bulgaria (Deputy Leader), 2016: Bulgaria (Deputy Leader) |
| Andrei | Mîndru | 2016: EGMO 2016 Staff (Guide: Italy) |
| Ryu | Minegishi | 2015: Japan (Observer with Leader), 2016: Japan (Observer with Leader), 2017: Japan (Leader), 2018: Japan (Leader) |
| Maryna | Minko | 2019: EGMO 2019 Staff (Guide: Georgia) |
| Maya | Minkova | 2024: Bulgaria (Contestant 3: Bronze Medal), 2025: Bulgaria (Contestant 1: Bronze Medal) |
| Entela | Mirena | 2024: Kosovo (Contestant 2), 2025: Kosovo (Contestant 4) |
| Rozalina | Mirgalimova | 2020: Russian Federation (Contestant 1: Gold Medal), 2021: Russian Federation (Contestant 3: Gold Medal) |
| Dorina | Mirică | 2016: EGMO 2016 Staff (Invigilator) |
| Darya | Miron | 2015: EGMO 2015 Staff (Guide: Switzerland) |
| Mikhail | Mironchik | 2015: EGMO 2015 Staff (Organization Committee) |
| Adolph | Mirotin | 2015: EGMO 2015 Staff (Coordinator) |
| Mihaela | Miruleţ | 2016: EGMO 2016 Staff (Treasurer) |
| Hokuma | Mirzabayova | 2024: Azerbaijan (Observer with Contestants) |
| Buşra | Mirzamlı | 2014: Türkiye B (Contestant 3) |
| Matevž | Miščič | 2023: EGMO 2023 Staff (Guide: Colombia) |
| Mjellma | Misini | 2025: EGMO 2025 Staff (Guide: United Kingdom) |
| Magdaléna | Mišinová | 2018: Czechia (Contestant 3: Bronze Medal), 2019: Czechia (Contestant 2: Gold Medal), 2020: Czechia (Contestant 2: Gold Medal), 2023: Czechia (Deputy Leader) |
| Anja | Miško | 2023: EGMO 2023 Staff (Media) |
| Hristina | Mitreska | 2020: North Macedonia (Contestant 2: Bronze Medal), 2025: North Macedonia (Deputy Leader) |
| Aida | Mitroi | 2023: Romania (Contestant 3: Silver Medal), 2024: Romania (Contestant 2: Gold Medal), 2025: Romania (Contestant 4: Gold Medal) |
| Nina | Mitrovic | 2019: Austria (Contestant 2: Bronze Medal) |
| Tamara | Mitrovska | 2016: The former Yugoslav Republic of Macedonia (Contestant 4), 2017: The former Yugoslav Republic of Macedonia (Contestant 1: Honourable Mention), 2018: The former Yugoslav Republic of Macedonia (Contestant 1: Honourable Mention) |
| Yoshihiro | Miyashita | 2019: Japan (Observer with Deputy) |
| Narek | Mkrtumyan | 2025: Armenia (Deputy Leader) |
| Yoana | Mladenova | 2025: Bulgaria (Contestant 2: Honourable Mention) |
| Ema | Mlinar | 2019: Slovenia (Contestant 3: Bronze Medal) |
| Aleksandra | Mnich | 2015: Poland (Contestant 2: Bronze Medal) |
| Mendel | Mobach | 2020: EGMO 2020 Staff (Organiser) |
| Yarden | Modai | 2017: Israel (Contestant 3: Silver Medal), 2023: Israel (Deputy Leader), 2024: Israel (Leader), 2025: Israel (Leader) |
| Davit | Modebadze | 2024: EGMO 2024 Staff (Guide: Türkiye) |
| Maryam | Modupeola Omobolanle Idowu | 2023: Norway (Contestant 3), 2025: Norway (Contestant 4) |
| Therese | Moerschell | 2015: Switzerland (Contestant 3) |
| Anastasia | Mokhova | 2017: EGMO 2017 Staff (Guide: Russian Federation) |
| Knut-Iver | Molden Lodsby | 2013: Norway (Observer with Contestants), 2014: Norway (Observer with Contestants), 2015: Norway (Observer with Contestants) |
| Bálint | Molnár | 2022: EGMO 2022 Staff (Guide: Norway) |
| Gábor | Molnár-Sáska | 2022: EGMO 2022 Staff (Treasurer) |
| Lara | Monagel | 2020: Saudi Arabia (Contestant 4: Honourable Mention), 2021: Saudi Arabia (Contestant 3: Bronze Medal), 2022: Saudi Arabia (Contestant 2: Honourable Mention) |
| Andrei | Monastyrny | 2015: EGMO 2015 Staff (Organization Committee) |
| Mihai | Monea | 2016: EGMO 2016 Staff (Coordinator) |
| Samuele | Mongodi | 2013: Italy (Leader), 2018: EGMO 2018 Staff (Problem Selection) |
| Antonio | Montero | 2023: EGMO 2023 Staff (Coordinator) |
| Laura | Montes | 2023: Colombia (Contestant 2) |
| German José | Mora Sáenz | 2019: Costa Rica (Leader) |
| Claudia | Morales Aguilar | 2020: Spain (Contestant 4) |
| Vera | Morancho Bargas | 2024: Spain (Contestant 2: Honourable Mention), 2025: Spain (Contestant 2: Silver Medal) |
| Francesco | Morandin | 2012: Italy (Leader), 2018: EGMO 2018 Staff (Chief Guide) |
| Mariam | Morchiashvili | 2024: EGMO 2024 Staff (Guide: Georgia B) |
| Cecilia | Moriggi | 2021: Italy (Contestant 3) |
| Rinesë | Morina | 2021: Kosovo (Contestant 2) |
| Etsuro | Moriya | 2021: Japan (Leader) |
| Greta | Morkūnė | 2024: Lithuania (Leader) |
| Alisson | Morón | 2025: Peru (Contestant 3) |
| Cristinel | Mortici | 2016: EGMO 2016 Staff (Coordinator) |
| Marta | Mościcka | 2016: Poland (Contestant 2: Silver Medal), 2019: Poland (Deputy Leader) |
| Andreea | Mosor | 2016: EGMO 2016 Staff (Guide: Republic of Moldova) |
| Sean | Moss | 2012: EGMO 2012 Staff (Coordinator) |
| Julia | Mosseri | 2016: France (Contestant 3) |
| Edmilson | Motta | 2017: Brazil (Leader) |
| Carolina | Moura Valle Costa | 2020: Brazil (Contestant 2: Bronze Medal) |
| Nathalie | Mousel | 2013: EGMO 2013 Staff (Guide: Belarus, Poland, Sweden) |
| Tatiana | Mouzykantskii | 2022: United Kingdom (Contestant 1: Bronze Medal) |
| Veno | Mramor | 2016: Slovenia (Leader), 2017: Slovenia (Leader) |
| Barbara | Mroczek | 2012: Poland (Contestant 2: Gold Medal), 2013: Poland (Contestant 3: Gold Medal), 2015: Poland (Deputy Leader) |
| Tīna | Muceniece | 2025: Latvia (Contestant 4) |
| Helena | Muchová | 2025: Czechia (Contestant 3: Bronze Medal) |
| Francesco | Mugelli | 2018: EGMO 2018 Staff (Staff) |
| Patrick | Muggli | 2017: EGMO 2017 Staff (Staff) |
| Damjan | Muhič | 2023: EGMO 2023 Staff (Staff) |
| Alen | Mujkanović | 2017: EGMO 2017 Staff (Leader Guide, Staff) |
| Nuraiym | Mukhamatnabieva | 2025: Kyrgyzstan (Contestant 4) |
| Kamilya | Mukhametshina | 2017: Russian Federation (Contestant 2: Silver Medal) |
| Carole | Muller | 2012: Luxembourg (Contestant 2), 2013: EGMO 2013 Staff (Guide: Hungary, Slovenia, Ukraine, United Kingdom, Invigilator) |
| Nadine | Muller | 2013: Luxembourg (Contestant 4) |
| Sarina Franziska | Müller | 2018: Switzerland (Contestant 1: Honourable Mention) |
| Jessica | Mulpas | 2013: Belgium (Contestant 4: Honourable Mention), 2018: Belgium (Deputy Leader) |
| Shreya Shantanu | Mundhada | 2025: India (Contestant 2: Silver Medal) |
| Karla Rebeca | Munguia Romero | 2019: Mexico (Contestant 3: Silver Medal), 2020: Mexico (Contestant 2: Silver Medal), 2021: Mexico (Contestant 3: Gold Medal) |
| Amin-Erdene | Munkhbayar | 2023: Mongolia (Contestant 3: Honourable Mention), 2024: Mongolia (Contestant 3: Bronze Medal) |
| Alejandra | Muñoz Espín | 2025: Mexico (Contestant 4: Bronze Medal) |
| Salome | Murdalashvili | 2024: Georgia (Contestant 2: Honourable Mention) |
| Manuel | Murillo Tsijli | 2022: Costa Rica (Observer with Contestants) |
| Taiga | Murray | 2024: Ireland (Deputy Leader) |
| Marta | Mussi | 2018: EGMO 2018 Staff (Staff) |
| Alice | Musso | 2018: EGMO 2018 Staff (Guide: Israel) |
| Siona | Mustafa | 2025: EGMO 2025 Staff (Guide: Bulgaria) |
| Elnara | Mustafayeva | 2023: Azerbaijan (Observer with Contestants) |
| Anca | Mustata | 2012: Ireland (Deputy Leader), 2013: Ireland (Leader), 2017: Ireland (Deputy Leader), 2019: Ireland (Leader), 2022: Ireland (Leader) |
| Anna | Mustata | 2013: Ireland (Contestant 4: Honourable Mention), 2014: Ireland (Contestant 3), 2015: Ireland (Contestant 3: Silver Medal), 2016: Ireland (Contestant 2: Silver Medal), 2017: Ireland (Contestant 2: Silver Medal) |
| Dragos Andrei | Mustata | 2016: Ireland (Deputy Leader), 2017: Ireland (Leader) |
| Aditi | Muthkhod | 2021: India (Contestant 1: Honourable Mention), 2024: India (Deputy Leader), 2025: India (Deputy Leader) |
| Oksana | Myakinnik | 2015: EGMO 2015 Staff (Organization Committee) |
| Syerikbolsyn | Myeiram | 2025: Kazakhstan (Deputy Leader) |
| Joseph | Myers | 2012: EGMO 2012 Staff (IT, Coordinator, EGMO Committee, Problem Selection), 2013: EGMO 2013 Staff (IT, Coordinator), 2014: EGMO 2014 Staff (IT, Coordinator), 2015: EGMO 2015 Staff (IT, Coordinator), 2016: EGMO 2016 Staff (IT, Coordinator), 2017: EGMO 2017 Staff (IT, Coordinator), 2018: EGMO 2018 Staff (IT), 2019: EGMO 2019 Staff (IT), 2020: EGMO 2020 Staff (Organiser), 2021: EGMO 2021 Staff (IT), 2022: EGMO 2022 Staff (IT, Coordinator), 2023: EGMO 2023 Staff (IT), 2024: EGMO 2024 Staff (IT), 2025: EGMO 2025 Staff (IT) |
| Alina | Myrsabekova | 2021: Kyrgyzstan (Contestant 2) |
| Heloísa | Mysczak | 2025: Brazil (Contestant 3: Honourable Mention) |
| Dea | Myshketa | 2020: Albania (Contestant 4) |
| Astrid | Mysterud | 2021: Norway (Contestant 4), 2022: Norway (Contestant 2), 2025: Norway (Deputy Leader) |
| Maria | Mytrofankina | 2019: EGMO 2019 Staff (Guide: Azerbaijan) |
| Bhavya Sree | N. Naga | 2023: India (Contestant 4: Honourable Mention) |
| Adrian | Naço | 2017: Albania (Leader), 2018: Albania (Leader), 2019: Albania (Leader), 2020: Albania (Leader), 2021: Albania (Leader), 2022: Albania (Leader), 2023: Albania (Leader), 2024: Albania (Leader), 2025: Albania (Leader) |
| Giorgi | Nadiradze | 2017: EGMO 2017 Staff (Staff) |
| Ana-Maria | Nadolo | 2016: EGMO 2016 Staff (Staff) |
| Savel | Nae | 2016: EGMO 2016 Staff (Staff) |
| Aya | Nagao | 2021: Japan (Contestant 1: Bronze Medal), 2022: Japan (Contestant 2: Gold Medal), 2023: Japan (Contestant 2: Gold Medal) |
| Maruša | Naglič | 2023: EGMO 2023 Staff (Entertainment) |
| Kartal | Nagy | 2022: EGMO 2022 Staff (Coordinator) |
| Leila | Nagy | 2022: Hungary (Contestant 4: Bronze Medal) |
| Nándor | Nagy | 2022: EGMO 2022 Staff (Coordinator) |
| Zoltán Lóránt | Nagy | 2013: Hungary (Deputy Leader), 2014: Hungary (Leader), 2015: Hungary (Leader), 2016: Hungary (Leader), 2017: Hungary (Leader), 2018: Hungary (Leader), 2022: EGMO 2022 Staff (Organiser) |
| Masahiro | Nakagawa | 2016: Japan (Observer with Leader), 2017: Japan (Observer with Leader) |
| Yusuke | Nakamura | 2017: Japan (Observer with Deputy), 2024: Japan (Leader), 2025: Japan (Leader) |
| Laura | Nan | 2023: Australia (Contestant 2: Gold Medal), 2024: Australia (Contestant 2: Gold Medal), 2025: Australia (Contestant 1: Gold Medal) |
| Bolor | Naranbaatar | 2023: Mongolia (Contestant 4: Bronze Medal), 2024: Mongolia (Contestant 4), 2025: Mongolia (Contestant 1: Bronze Medal) |
| Suvd | Naranbaatar | 2022: Mongolia (Contestant 2: Bronze Medal) |
| Maryia | Narbina | 2024: Belarus (Contestant 4) |
| Neda | Narmontaitė | 2020: Lithuania (Contestant 3) |
| Andrea | Narváez | 2019: Ecuador (Deputy Leader) |
| Mirte | Nauta | 2024: Netherlands (Contestant 2: Bronze Medal) |
| Maya | Naveh | 2016: Israel (Contestant 2: Silver Medal), 2017: Israel (Contestant 4: Silver Medal), 2018: Israel (Contestant 1: Gold Medal) |
| Jovilė | Navickaitė | 2022: Lithuania (Contestant 4: Honourable Mention), 2023: Lithuania (Contestant 4: Honourable Mention), 2024: Lithuania (Contestant 2: Bronze Medal), 2025: Lithuania (Contestant 1: Honourable Mention) |
| Tejaswi "TJ" | Navilarekallu | 2020: EGMO 2020 Staff (Coordinator, Problem Selection) |
| Violeta | Naydenova | 2014: Bulgaria (Contestant 4: Silver Medal), 2015: Bulgaria (Contestant 2: Silver Medal), 2016: Bulgaria (Contestant 2: Gold Medal), 2020: Bulgaria (Leader), 2024: Bulgaria (Leader), 2025: Bulgaria (Deputy Leader) |
| Vicky | Neale | 2012: EGMO 2012 Staff (EGMO Committee) |
| Yozlen Vedat | Neazi | 2014: EGMO 2014 Staff (Guide: Bulgaria) |
| Olga | Nechaeva | 2020: Russian Federation (Deputy Leader) |
| Karyna | Nechyporuk | 2018: Ukraine (Contestant 3: Silver Medal), 2019: Ukraine (Contestant 3: Gold Medal), 2023: EGMO 2023 Staff (Coordinator), 2024: EGMO 2024 Staff (Coordinator) |
| Demira | Nedeva | 2024: Bulgaria (Contestant 2: Bronze Medal) |
| Antoanela | Negotei | 2016: EGMO 2016 Staff (Invigilator) |
| Alexandru | Negrescu | 2016: EGMO 2016 Staff (Coordinator) |
| Alin | Neguţescu | 2016: EGMO 2016 Staff (Guide: Belarus) |
| Gennady | Nekhai | 2015: EGMO 2015 Staff (Organization Committee) |
| Pavlena | Nenova | 2012: Bulgaria (Contestant 1: Gold Medal), 2013: Bulgaria (Contestant 1: Silver Medal), 2014: Bulgaria (Contestant 1: Silver Medal), 2017: Bulgaria (Deputy Leader), 2018: Bulgaria (Leader) |
| Sofia | Neophytou | 2022: Cyprus (Contestant 4), 2023: Cyprus (Contestant 2), 2024: Cyprus (Contestant 3) |
| Elizaveta | Neustroeva | 2020: Russian Federation (Contestant 3: Gold Medal) |
| Anouk | Neven | 2013: EGMO 2013 Staff (Coordinator) |
| Craig | Newbold | 2012: EGMO 2012 Staff (Coordinator) |
| Daniel | Neyen | 2013: Luxembourg (Deputy Leader) |
| Polina | Nezalzova | 2014: EGMO 2014 Staff (Guide: Belarus) |
| Dren | Neziri | 2023: Kosovo (Deputy Leader), 2024: EGMO 2024 Staff (Coordinator), 2025: EGMO 2025 Staff (Problem Selection, Coordinator) |
| Diep Bich | Nguyen | 2020: Hungary (Contestant 3: Bronze Medal), 2021: Hungary (Contestant 3: Bronze Medal), 2022: EGMO 2022 Staff (Guide: Cyprus) |
| Kim Dorka | Nguyen | 2024: Hungary (Contestant 4: Bronze Medal) |
| Le Thanh Tu | Nguyen | 2012: Switzerland (Leader), 2017: EGMO 2017 Staff (Coordinator) |
| Jan Agentoft | Nielsen | 2019: Denmark (Deputy Leader), 2020: Denmark (Deputy Leader) |
| Lekë | Nikçi | 2025: EGMO 2025 Staff (Guide: Luxembourg) |
| Katya | Nikitchenko | 2022: Netherlands (Contestant 2: Honourable Mention), 2023: Netherlands (Contestant 3: Bronze Medal), 2024: Netherlands (Contestant 3: Bronze Medal) |
| Marekhi | Nikoladze | 2021: EGMO 2021 Staff (Staff), 2022: Georgia (Observer with Leader), 2023: Georgia (Observer with Leader, EGMO Board), 2024: EGMO 2024 Staff (EGMO Board) |
| Arsenii | Nikolaev | 2019: EGMO 2019 Staff (Problem Selection, Coordinator) |
| Maria - Eleni | Nikolaou | 2023: Greece (Contestant 2: Honourable Mention) |
| Nevena | Nikolic | 2012: Serbia (Contestant 1: Bronze Medal) |
| Katarina | Nikolić | 2016: Serbia (Contestant 4: Honourable Mention) |
| Desislava | Nikolova | 2020: Bulgaria (Contestant 1: Bronze Medal) |
| Joana | Nikolova | 2018: Bulgaria (Contestant 4: Silver Medal) |
| Kalina | Nikolova | 2020: Bulgaria (Contestant 2: Silver Medal), 2021: Bulgaria (Contestant 4), 2022: Bulgaria (Contestant 4: Silver Medal) |
| Emilija | Nikolovska | 2021: North Macedonia (Contestant 4: Bronze Medal), 2022: North Macedonia (Contestant 1: Honourable Mention), 2023: North Macedonia (Contestant 1: Bronze Medal), 2024: North Macedonia (Contestant 1) |
| Emma | Nimstad | 2013: Sweden (Contestant 2: Honourable Mention) |
| Yixuan | Ning | 2025: New Zealand (Contestant 3: Bronze Medal) |
| Feike | NLD1-2014 | 2014: Netherlands (Contestant 1), 2015: Netherlands (Contestant 1: Honourable Mention), 2020: Netherlands (Deputy Leader) |
| Rozhin | Nobahari | 2014: Islamic Republic of Iran (Contestant 3: Bronze Medal) |
| Noreta | Nordena | 2016: Latvia (Contestant 1) |
| Farahnoz | Normurodzoda | 2021: Tajikistan (Contestant 4: Bronze Medal), 2022: Tajikistan (Contestant 1: Honourable Mention), 2023: Tajikistan (Contestant 2: Honourable Mention) |
| Klara | Nosan | 2013: Slovenia (Contestant 2), 2014: Slovenia (Contestant 4), 2015: Slovenia (Contestant 3: Honourable Mention) |
| Helena | Noser | 2017: EGMO 2017 Staff (Staff) |
| Lana | Nouri | 2024: Saudi Arabia (Contestant 4) |
| Ivan | Novak | 2022: Croatia (Leader), 2023: Croatia (Leader), 2025: EGMO 2025 Staff (Coordinator) |
| Aliaksandra | Novik | 2018: Belarus (Contestant 2: Silver Medal), 2019: Belarus (Contestant 1: Silver Medal), 2024: EGMO 2024 Staff (Coordinator) |
| Aivaras | Novikas | 2015: Lithuania (Deputy Leader), 2016: Lithuania (Leader), 2017: Lithuania (Leader), 2018: Lithuania (Leader), 2019: Lithuania (Leader), 2020: Lithuania (Leader), 2022: Lithuania (Leader), 2023: Lithuania (Leader), 2024: Lithuania (Deputy Leader) |
| Daryna | Novykova | 2019: EGMO 2019 Staff (Guide: North Macedonia) |
| Aspasia | Ntarara | 2024: Greece (Contestant 3) |
| Elma | Nuhanović | 2017: Bosnia and Herzegovina (Contestant 3: Honourable Mention) |
| Akerke | Nurakhmetova | 2021: Kazakhstan (Contestant 3: Bronze Medal), 2023: Kazakhstan (Contestant 4: Silver Medal) |
| Veera | Nurmela | 2018: Finland (Contestant 2), 2019: Finland (Contestant 2), 2020: Finland (Contestant 3), 2021: Finland (Contestant 2), 2022: Finland (Deputy Leader), 2023: Finland (Deputy Leader), 2024: Finland (Leader) |
| Laís | Nuto Rossman | 2021: Brazil (Contestant 3) |
| Jean | O'Brien | 2017: Ireland (Contestant 3: Honourable Mention) |
| Katie Louise | O'Connor | 2015: Ireland (Contestant 4), 2016: Ireland (Contestant 4) |
| Doris | Obermaier | 2020: Austria (Contestant 2), 2021: Austria (Contestant 2: Bronze Medal), 2022: Austria (Contestant 1: Bronze Medal) |
| Naja | Oblak | 2025: Slovenia (Contestant 4: Honourable Mention) |
| Joanna | Ochremiak | 2012: Poland (Deputy Leader), 2013: Poland (Deputy Leader), 2014: Poland (Deputy Leader) |
| Eva | Ocvirk | 2023: EGMO 2023 Staff (Guide: Czechia) |
| Anastassiya | Odintsova | 2022: Kazakhstan (Contestant 3: Honourable Mention), 2023: Kazakhstan (Contestant 2: Silver Medal), 2024: Kazakhstan (Contestant 3: Silver Medal) |
| Annika | Oehri | 2017: Liechtenstein (Contestant 2) |
| Maya | Ogita | 2014: Japan (Contestant 3: Bronze Medal), 2015: Japan (Contestant 3: Gold Medal), 2016: Japan (Contestant 2: Gold Medal), 2019: Japan (Observer with Leader) |
| Eilis | OHalloran | 2021: Ireland (Contestant 4) |
| Shiori | Ohno | 2022: Japan (Contestant 3) |
| Himena | Okamoto | 2014: Japan (Contestant 4) |
| Endy Lumy | Okamura Miyashita | 2022: Brazil (Contestant 2: Bronze Medal), 2023: Brazil (Contestant 4) |
| Kana | Okazaki | 2021: Japan (Contestant 2) |
| Ani | Okropiridze | 2024: EGMO 2024 Staff (Guide: Hungary) |
| Anna | Olech | 2012: Poland (Contestant 3: Silver Medal), 2013: Poland (Contestant 4: Bronze Medal) |
| Līva | Oliņa | 2020: Latvia (Contestant 4), 2021: Latvia (Contestant 2) |
| Mariana | Oliveira | 2018: Brazil (Contestant 2: Bronze Medal) |
| Adél | Olosz | 2022: EGMO 2022 Staff (Guide) |
| Mircea | Olteanu | 2016: EGMO 2016 Staff (Coordinator) |
| Başak | Önder | 2014: Türkiye (Contestant 4) |
| Vendula | Onderková | 2021: Czechia (Contestant 1: Bronze Medal) |
| Abdullah | Öner | 2014: EGMO 2014 Staff (Academic assistant) |
| Ana | Onoprishvili | 2018: Georgia (Contestant 3: Silver Medal), 2019: Georgia (Contestant 2: Gold Medal), 2020: Georgia (Contestant 1: Gold Medal), 2021: Georgia (Contestant 3: Gold Medal), 2022: Georgia (Leader) |
| Gülşah | Onur | 2012: Türkiye (Contestant 3: Bronze Medal) |
| Ana | Opalič | 2017: Slovenia (Contestant 3), 2018: Slovenia (Contestant 3: Honourable Mention), 2020: Slovenia (Contestant 2), 2023: EGMO 2023 Staff (Guide: Australia) |
| David | Opalič | 2019: Slovenia (Deputy Leader), 2023: EGMO 2023 Staff (Coordinator) |
| Evelina | Orfanidou | 2018: Cyprus (Contestant 2) |
| Olympia | Orfanidou | 2025: Cyprus (Deputy Leader) |
| Georgia | Orphanidou | 2018: Cyprus (Contestant 4) |
| Sofía | Ortega Castillo | 2023: Mexico (Leader) |
| Mariana | Ortiz | 2023: Colombia (Contestant 4) |
| Özge Dilay | Örüm | 2020: Türkiye (Contestant 3: Honourable Mention) |
| Nicole | Ospelt | 2017: Liechtenstein (Contestant 1: Honourable Mention), 2018: Liechtenstein (Contestant 1: Honourable Mention) |
| Ronja Amalie | Østergaard | 2022: Denmark (Contestant 4) |
| Alina | Ostrov | 2023: Republic of Moldova (Contestant 4), 2024: Republic of Moldova (Contestant 4) |
| Yunshu | Ouyang | 2016: Switzerland (Contestant 3), 2017: Switzerland (Contestant 1: Honourable Mention), 2018: Switzerland (Contestant 2: Bronze Medal), 2019: Switzerland (Deputy Leader) |
| Kati | Overbeeke | 2020: Netherlands (Contestant 3: Bronze Medal) |
| Jenny | Owladi | 2015: United Kingdom (Deputy Leader), 2016: United Kingdom (Deputy Leader), 2017: United Kingdom (Deputy Leader), 2018: United Kingdom (Deputy Leader), 2019: United Kingdom (Leader), 2020: United Kingdom (Leader), 2021: United Kingdom (Leader), 2022: United Kingdom (Leader) |
| Ayşe Pelin | Özcan | 2015: Türkiye (Contestant 4: Bronze Medal), 2016: Türkiye (Contestant 4: Silver Medal) |
| Recep | Özkan | 2014: EGMO 2014 Staff (Academic assistant) |
| Rūta | Ozoliņa | 2017: Latvia (Contestant 2), 2018: Latvia (Contestant 2: Honourable Mention) |
| Yanina | Padshyblava | 2015: EGMO 2015 Staff (Guide: United States of America) |
| Camelia | Pădure | 2016: EGMO 2016 Staff (Invigilator) |
| Dušan | Pagon | 2023: EGMO 2023 Staff (Guide) |
| Anita Dalma | Páhán | 2022: Hungary (Contestant 3: Silver Medal) |
| Milanna | Pahasian | 2021: Belarus (Contestant 4: Silver Medal), 2022: Belarus (Contestant 1: Gold Medal) |
| Ieva | Pakalna | 2016: Latvia (Contestant 4), 2017: Latvia (Contestant 1: Honourable Mention) |
| Marina | Pakholiuk | 2019: EGMO 2019 Staff (Guide: Spain) |
| Urshita | Pal | 2018: India (Contestant 2: Bronze Medal) |
| Tatsiana | Palikarpava | 2015: Belarus B (Contestant 2) |
| Justyna | Palikowska | 2021: Poland (Contestant 3: Bronze Medal) |
| Alina | Paliulionytė | 2019: Lithuania (Contestant 3: Silver Medal) |
| Julija | Paliulionytė | 2018: Lithuania (Contestant 4: Bronze Medal), 2019: Lithuania (Contestant 4: Silver Medal) |
| Jana | Pallová | 2017: Czechia (Contestant 3: Honourable Mention), 2018: Czechia (Contestant 4: Honourable Mention) |
| Neea | Palojärvi | 2012: Finland (Contestant 3: Honourable Mention), 2013: Finland (Contestant 3), 2017: Finland (Leader), 2018: Finland (Deputy Leader), 2019: Finland (Deputy Leader), 2020: Finland (Leader), 2021: Finland (Deputy Leader), 2022: Finland (Leader) |
| Eugen | Păltănea | 2016: EGMO 2016 Staff (Coordinator) |
| Alena | Panotchyk | 2014: Belarus (Contestant 3) |
| Natalija | Pantić | 2023: Serbia (Contestant 3) |
| Jan | Pantner | 2023: Slovenia B (Deputy Leader) |
| Giovanni | Paolini | 2018: EGMO 2018 Staff (Coordinator) |
| Gronchi | Paolo | 2018: EGMO 2018 Staff (Staff) |
| Salome | Papiashvili | 2017: Georgia (Contestant 4: Honourable Mention) |
| Theoklitos | Paragyiou | 2017: Cyprus (Deputy Leader), 2018: Cyprus (Deputy Leader) |
| Darya | Paramonava | 2015: EGMO 2015 Staff (Guide: Belarus, Belarus B) |
| Adrian | Paraschiv | 2016: EGMO 2016 Staff (Guide: Ecuador) |
| Daiana | Paraschiv | 2016: EGMO 2016 Staff (Invigilator) |
| Fjona | Parllaku | 2014: Albania (Contestant 4), 2016: Albania (Contestant 2) |
| Orsolya | Paróczi | 2022: EGMO 2022 Staff (Guide: Ireland) |
| Anousha | Parvaneh | 2013: Sweden (Contestant 3) |
| Manon | Pasbeau | 2024: France (Contestant 3) |
| Amila | Pašić | 2025: Bosnia and Herzegovina (Contestant 1: Bronze Medal) |
| Daria | Pasqualetti | 2020: Italy (Contestant 3: Bronze Medal), 2021: Italy (Contestant 4: Bronze Medal), 2022: Italy (Contestant 4: Silver Medal), 2025: Italy (Deputy Leader) |
| Siarhei | Pastayalka | 2015: EGMO 2015 Staff (Guide: Belgium) |
| Hector | Pasten | 2020: Chile (Leader) |
| Liisa | Pata | 2023: Estonia (Contestant 2), 2024: Estonia (Contestant 2) |
| Sunaina | Pati | 2023: India (Contestant 2: Silver Medal) |
| Saee | Patil | 2024: India (Contestant 3: Bronze Medal), 2025: India (Contestant 3: Bronze Medal) |
| Tanish | Patil | 2023: EGMO 2023 Staff (Coordinator) |
| Raagini | Patki | 2015: India (Contestant 2) |
| Adelina | Patlatîi | 2020: Republic of Moldova (Contestant 4: Bronze Medal), 2021: Republic of Moldova (Contestant 3: Honourable Mention), 2022: Republic of Moldova (Contestant 2: Bronze Medal) |
| Gianna | Paulin | 2017: EGMO 2017 Staff (Guide: Bosnia and Herzegovina, Cyprus) |
| Liviu | Păunescu | 2016: EGMO 2016 Staff (Coordinator) |
| Sofija | Pavlekić | 2023: Serbia (Contestant 4: Honourable Mention) |
| Blaž | Pavlič | 2023: EGMO 2023 Staff (Entertainment) |
| Styliani | Pavlidou | 2020: Greece (Contestant 4) |
| Mariia | Pavliuk | 2012: Ukraine (Contestant 2: Silver Medal) |
| Camille | Pawlowski | 2025: France (Contestant 3: Bronze Medal) |
| Bogna | Pawlus | 2015: Poland (Contestant 3: Bronze Medal), 2016: Poland (Contestant 3: Silver Medal), 2017: Poland (Contestant 3: Silver Medal) |
| Bojan | Pažin | 2016: Bosnia and Herzegovina (Deputy Leader) |
| Ana Beatriz | Pazó | 2025: Brazil (Contestant 2: Silver Medal) |
| María | Pe Pereira | 2023: Spain (Deputy Leader), 2024: Spain (Leader) |
| Tamar | Pe'er | 2021: Israel (Contestant 1), 2022: Israel (Contestant 1: Bronze Medal) |
| Teodora | Pecakovska | 2019: North Macedonia (Contestant 3: Honourable Mention) |
| Joana | Pech Alberich | 2020: Spain (Contestant 2: Silver Medal) |
| Michal | Pecho | 2024: EGMO 2024 Staff (Coordinator), 2025: Slovakia (Leader) |
| Ana | Peçini | 2016: Albania (Contestant 1: Honourable Mention) |
| Dhespina Pepa | Peçini | 2018: Albania (Contestant 4: Honourable Mention), 2020: Albania (Contestant 2) |
| Maruša | Pečovnik | 2013: Slovenia (Contestant 3: Bronze Medal) |
| Kirsten | Peeters | 2015: Netherlands (Contestant 3) |
| Marie | Peeters | 2017: Belgium (Contestant 4: Honourable Mention), 2018: Belgium (Contestant 4: Bronze Medal), 2019: Belgium (Contestant 2: Bronze Medal), 2022: Belgium (Deputy Leader), 2023: Belgium (Deputy Leader), 2024: Belgium (Deputy Leader), 2025: Belgium (Deputy Leader) |
| Tamar | Peikrishvili | 2021: Georgia B (Contestant 3), 2022: Georgia (Contestant 1: Silver Medal), 2023: Georgia (Contestant 1: Silver Medal), 2024: Georgia (Contestant 1: Silver Medal) |
| Marianne | Peña Wüst | 2017: Costa Rica (Contestant 4), 2018: Costa Rica (Contestant 1) |
| Ruqian | Peng | 2024: People's Republic of China (Deputy Leader) |
| Sophie | Peng | 2012: Belgium (Contestant 2: Honourable Mention) |
| Paolo | Penna | 2017: EGMO 2017 Staff (Invigilator) |
| Alessia | Pepa | 2023: Albania (Contestant 4) |
| Daniel | Perales Anaya | 2015: Mexico (Leader) |
| Keti | Peranidze | 2024: EGMO 2024 Staff (Guide: Italy) |
| Daria | Perekopska | 2025: Ukraine (Contestant 3: Bronze Medal) |
| Marius | Perianu | 2016: EGMO 2016 Staff (Coordinator) |
| Ludovico | Pernazza | 2017: EGMO 2017 Staff (Observer), 2018: EGMO 2018 Staff (Chief of Staff) |
| Klára | Pernicová | 2021: Czechia (Contestant 2: Bronze Medal) |
| Mary-Lou | Perrier D'Hauterive | 2016: Belgium (Contestant 4) |
| Pinja | Pessi | 2017: Finland (Contestant 1) |
| Jonathan | Peters | 2013: Ireland (Deputy Leader), 2014: Ireland (Leader) |
| Liljana | Petova | 2019: Albania (Contestant 4) |
| Constantin | Petrea | 2016: EGMO 2016 Staff (Staff) |
| Olha | Petrenko | 2019: EGMO 2019 Staff (Guide Team Lead) |
| Sára | Petres | 2016: EGMO 2016 Staff (Guide: Hungary) |
| Lucian | Petrescu | 2016: EGMO 2016 Staff (Coordinator) |
| Andrey | Petrosyan | 2014: EGMO 2014 Staff (Guide: Poland) |
| Kalina | Petrova | 2012: Bulgaria (Contestant 3: Silver Medal) |
| Job | Petrovčič | 2023: EGMO 2023 Staff (Coordinator) |
| Vlada | Petrusenko | 2019: Ukraine (Contestant 4: Gold Medal) |
| Enora | Pétry | 2019: France (Contestant 3: Bronze Medal) |
| Anaëlle | Pfister | 2017: Switzerland (Contestant 2), 2018: Switzerland (Contestant 3: Honourable Mention), 2020: Switzerland (Deputy Leader), 2021: Switzerland (Leader), 2022: Switzerland (Deputy Leader), 2024: Switzerland (Leader) |
| Mirian | Phaikidze | 2024: EGMO 2024 Staff (Guide: Bangladesh) |
| Huyền | Phạm | 2023: United Kingdom (Contestant 4: Bronze Medal) |
| David | Phillips | 2012: EGMO 2012 Staff (Invigilator) |
| Ani | Phurtskhvanidze | 2024: EGMO 2024 Staff (Guide: Spain) |
| Clémentine | Pialoux | 2024: France (Contestant 4: Honourable Mention) |
| Anna | Piatkova | 2021: Russian Federation (Contestant 4: Gold Medal) |
| Hanna | Piatryshyna | 2023: Belarus (Contestant 4: Bronze Medal) |
| Vanessa | Piccolo | 2017: EGMO 2017 Staff (Invigilator, Entertainment, Staff) |
| Tetyana | Pidkova | 2019: EGMO 2019 Staff (Guide: Saudi Arabia) |
| Laura | Pierson | 2013: United States of America (Contestant 4: Silver Medal) |
| Gabriela | Pietras | 2021: Poland (Contestant 4: Silver Medal), 2022: Poland (Contestant 3: Silver Medal) |
| Alicja | Pietrzak | 2020: Poland (Contestant 4: Bronze Medal) |
| Anete | Pihlak | 2025: Estonia (Contestant 1) |
| Derk | Pik | 2020: EGMO 2020 Staff (Organiser) |
| Michał | Pilipczuk | 2012: Poland (Leader), 2015: Poland (Leader), 2016: Poland (Leader) |
| Trevor | Pinto | 2012: EGMO 2012 Staff (Invigilator) |
| Vivian | Pinto | 2012: EGMO 2012 Staff (Invigilator) |
| Annamaria | Piri | 2012: Serbia (Contestant 2: Honourable Mention) |
| Gabriela-Madalina | Pirvulescu | 2023: Romania (Contestant 2: Silver Medal), 2024: Romania (Contestant 3: Gold Medal) |
| Zahra | Piryaei | 2014: Islamic Republic of Iran (Observer with Contestants) |
| Bilhana | Plamenova Kochloukova | 2023: Brazil (Contestant 3: Bronze Medal), 2024: Brazil (Contestant 1: Bronze Medal) |
| Alba | Pllana | 2025: Kosovo B (Contestant 1) |
| Arbi | Pllana | 2025: EGMO 2025 Staff (Guide: Croatia) |
| Aljaž | Plos | 2023: EGMO 2023 Staff (Guide: Greece) |
| Ruth | Plümer | 2022: Germany (Contestant 3: Bronze Medal) |
| Lidija | Podpečan | 2023: EGMO 2023 Staff (Staff) |
| Annegret | Pohle | 2017: EGMO 2017 Staff (Guide: Tunisia) |
| Clemens | Pohle | 2013: Switzerland (Leader), 2017: EGMO 2017 Staff (Problem Selection, Coordinator) |
| Špela | Polak | 2017: Slovenia (Contestant 4), 2018: Slovenia (Contestant 4: Honourable Mention), 2019: Slovenia (Contestant 4: Honourable Mention), 2023: EGMO 2023 Staff (Guide: Ukraine) |
| Refet | Polat | 2014: EGMO 2014 Staff (Chief Invigilator) |
| Valentyna | Poliukhovych | 2019: EGMO 2019 Staff (Guide: Kazakhstan) |
| Lenka | Poljaková | 2024: Czechia (Contestant 4: Bronze Medal) |
| Federico | Poloni | 2018: EGMO 2018 Staff (Problem Selection) |
| Waldemar | Pompe | 2013: Poland (Leader) |
| Lucija | Pongrac | 2024: Croatia (Contestant 3) |
| Tamara | Ponjavić | 2018: Serbia (Contestant 3: Silver Medal), 2019: Serbia (Contestant 2: Silver Medal) |
| Oxana | Ponomarenco | 2014: EGMO 2014 Staff (Guide: Romania, Ukraine) |
| Diana | Pop | 2016: EGMO 2016 Staff (Guide: The former Yugoslav Republic of Macedonia) |
| Alexandru | Popa | 2016: EGMO 2016 Staff (Guide) |
| Călin | Popescu | 2016: EGMO 2016 Staff (Problem Selection Chair) |
| Ioana | Popescu | 2019: Romania (Contestant 3: Bronze Medal), 2021: Romania (Contestant 1: Gold Medal), 2023: EGMO 2023 Staff (Coordinator) |
| Tetiana | Popova | 2019: EGMO 2019 Staff (Guide Team Lead) |
| Anhelina | Popovtseva | 2019: EGMO 2019 Staff (Guide Team Lead) |
| Ramona | Poreitere | 2023: Latvia (Contestant 3: Bronze Medal), 2024: Latvia (Contestant 1: Honourable Mention) |
| Kerry | Porrill | 2025: South Africa (Leader) |
| Morena | Porzio | 2015: Italy (Contestant 3: Bronze Medal), 2018: EGMO 2018 Staff (Staff) |
| Natalia | Postoienko | 2019: EGMO 2019 Staff (Guide: Albania) |
| Ella | Potisek | 2023: EGMO 2023 Staff (Guide: Latvia) |
| Alisa | Potomkina | 2024: Ukraine (Contestant 2: Gold Medal) |
| Marián | Poturnay | 2023: Slovakia (Leader), 2024: Slovakia (Leader) |
| Maria | Povna | 2019: EGMO 2019 Staff (Guide: Czechia) |
| Anjana | Prasad | 2015: India (Deputy Leader) |
| Arpi | Prazyan | 2025: Armenia (Contestant 2: Bronze Medal) |
| Jakob | Prelesnik | 2023: EGMO 2023 Staff (Guide: Ecuador) |
| Lorna Ndigai | Prestigiacomo | 2018: EGMO 2018 Staff (Guide: Netherlands) |
| Alise Ella | Pretkalniņa | 2014: Latvia (Contestant 4: Bronze Medal) |
| Leonarda | Pribanić | 2021: Croatia (Contestant 3) |
| Lana | Prijon | 2020: Slovenia (Contestant 3), 2021: Slovenia (Contestant 2), 2023: Slovenia (Deputy Leader) |
| Silvia-Elena | Pripoae | 2013: Romania (Contestant 3: Silver Medal), 2014: Romania (Contestant 3: Silver Medal) |
| Zuzana | Procházková | 2016: Czechia (Contestant 3) |
| Anna | Prochowska | 2014: Poland (Contestant 3: Bronze Medal) |
| Tobias | Pröger | 2017: EGMO 2017 Staff (Staff) |
| Nataliia | Prokopenko | 2012: Ukraine (Deputy Leader) |
| Dorette | Pronk | 2018: Canada (Leader), 2019: Canada (Leader), 2020: Canada (Leader) |
| Matteo | Protopapa | 2018: EGMO 2018 Staff (Guide: Australia) |
| Petruţa | Protopopescu | 2016: EGMO 2016 Staff (Staff) |
| Anastasiia | Prydalna | 2019: EGMO 2019 Staff (Guide: Germany) |
| Alicja | Przybylik | 2024: Poland (Contestant 2: Silver Medal) |
| Magdalena | Pudełko | 2024: Poland (Contestant 3: Silver Medal), 2025: Poland (Contestant 1: Gold Medal) |
| Luise | Puhlmann | 2018: Germany (Deputy Leader), 2019: Germany (Deputy Leader), 2020: Germany (Deputy Leader), 2021: Germany (Deputy Leader), 2022: Germany (Deputy Leader), 2023: Germany (Deputy Leader), 2024: Germany (Deputy Leader) |
| Quintijn | Puite | 2018: Netherlands (Deputy Leader), 2020: EGMO 2020 Staff (Chief Organiser) |
| Erida | Puka | 2023: Albania (Contestant 3), 2024: Albania (Contestant 1) |
| Josip | Pupić | 2020: Croatia (Deputy Leader) |
| Naida | Purišević | 2019: Bosnia and Herzegovina (Contestant 3: Silver Medal), 2020: Bosnia and Herzegovina (Contestant 3: Silver Medal), 2021: Bosnia and Herzegovina (Contestant 1: Silver Medal) |
| Otty Mulijaty | Purwodihardjo | 2020: Indonesia (Observer with Contestants) |
| Denys | Pushkin | 2019: Ukraine (Deputy Leader) |
| Mihaela | Pušnik | 2013: Slovenia (Contestant 4: Honourable Mention), 2015: Slovenia (Leader), 2017: EGMO 2017 Staff (Coordinator) |
| Primož | Pušnik | 2014: Slovenia (Leader) |
| Majed | Qanash | 2019: Saudi Arabia (Observer with Contestants), 2020: Saudi Arabia (Observer with Contestants) |
| Rafaa | Qanash | 2019: Saudi Arabia (Contestant 3: Honourable Mention), 2020: Saudi Arabia (Contestant 2), 2021: Saudi Arabia (Contestant 1: Silver Medal), 2022: Saudi Arabia (Contestant 1: Bronze Medal) |
| Klesta | Qehaja | 2025: EGMO 2025 Staff (Deputy Chief Invigilator) |
| Qi | Qi | 2017: United States of America (Contestant 3: Gold Medal) |
| Emma | Qin | 2019: United States of America (Contestant 1: Gold Medal) |
| Yiran | Qiu | 2023: People's Republic of China (Contestant 4: Gold Medal) |
| Xhoana | Qosja | 2017: Albania (Contestant 1) |
| Myriam | Qrichi Aniba | 2015: France (Contestant 3) |
| Melissa | Quail | 2017: United Kingdom (Contestant 2: Bronze Medal), 2018: United Kingdom (Contestant 2: Bronze Medal) |
| Maena | Quemener | 2022: France (Deputy Leader), 2024: France (Deputy Leader), 2025: EGMO 2025 Staff (Coordinator) |
| Rachel | Quinlan | 2012: Ireland (Leader) |
| Alice | Rabone | 2012: EGMO 2012 Staff (Guide: Ireland, Saudi Arabia) |
| Darya | Rabtsava | 2014: Belarus (Contestant 4: Silver Medal) |
| Katja | Račič | 2023: EGMO 2023 Staff (Guide) |
| Nevena | Radešić | 2018: Bosnia and Herzegovina (Contestant 3: Bronze Medal), 2019: Bosnia and Herzegovina (Contestant 2: Bronze Medal) |
| Ivayla | Radkova | 2022: Bulgaria (Contestant 1: Bronze Medal), 2023: Bulgaria (Contestant 4: Bronze Medal), 2024: Bulgaria (Deputy Leader) |
| Martin | Radman | 2023: EGMO 2023 Staff (Guide: United States of America) |
| Ana Maria | Radu | 2016: Romania B (Contestant 4: Bronze Medal) |
| Abdellah | Rahmani | 2024: Algeria (Leader) |
| Aliaksandr | Rahulin | 2015: EGMO 2015 Staff (Guide) |
| Apoorva | Rajadhyaksha | 2020: India (Contestant 2: Honourable Mention) |
| Mateja | Rajh Jager | 2023: EGMO 2023 Staff (Staff) |
| Kaja | Rajter | 2021: Slovenia (Contestant 3), 2022: Slovenia (Contestant 4: Honourable Mention), 2023: Slovenia (Contestant 2: Honourable Mention), 2024: Slovenia (Leader) |
| Sanja | Rajter | 2023: EGMO 2023 Staff (Media) |
| Edon | Ramadani | 2024: EGMO 2024 Staff (Coordinator), 2025: EGMO 2025 Staff (Coordinator) |
| Gabrielė | Ramanauskaitė | 2017: Lithuania (Contestant 4) |
| Narasimhan | Ramanujachari | 2016: India (Deputy Leader) |
| Nikalai | Ramasheuski | 2015: EGMO 2015 Staff (Guide) |
| Sara | Ramirez | 2023: Colombia (Contestant 3: Honourable Mention), 2024: Colombia (Contestant 2) |
| Stew | Ramsay | 2021: United Kingdom (Observer with Contestants) |
| Ananya | Ranade | 2021: India (Contestant 2: Silver Medal), 2022: India (Contestant 1: Bronze Medal), 2024: India (Observer with Contestants), 2025: India (Observer with Contestants) |
| Dario | Rancati | 2018: EGMO 2018 Staff (Coordinator) |
| Máté | Rancz | 2022: EGMO 2022 Staff (Guide: Israel) |
| Hedvika | Ranošová | 2016: Czechia (Contestant 4) |
| Isidora | Rapajić | 2023: EGMO 2023 Staff (Guide: Serbia) |
| Konstantina | Rasvani | 2019: Greece (Contestant 3: Honourable Mention) |
| Stefanie | Rauch | 2018: Austria (Contestant 1), 2019: Austria (Contestant 3: Honourable Mention) |
| Maayan | Ravid | 2025: Israel (Contestant 3: Honourable Mention) |
| Caroline Tue | Ravnkilde | 2023: Denmark (Contestant 2: Honourable Mention) |
| Volha | Razanava | 2015: EGMO 2015 Staff (Guide: France) |
| Anna | Rea Devic | 2017: EGMO 2017 Staff (Coordinator) |
| Gašper | Rebernik | 2023: EGMO 2023 Staff (Media) |
| Jamille | Rebouças | 2017: Brazil (Contestant 1: Bronze Medal) |
| Ana | Rechtman | 2014: Mexico (Leader) |
| Dominika | Regiec | 2015: Poland (Contestant 4: Bronze Medal), 2017: Poland (Deputy Leader), 2018: Poland (Deputy Leader), 2019: Poland (Leader), 2020: Poland (Leader), 2021: Poland (Leader) |
| Lorenz | Reichel | 2017: EGMO 2017 Staff (Chief Coordinator, Problem Selection) |
| Lucie | Reichertová | 2022: Czechia (Contestant 4) |
| Christian | Reiher | 2013: EGMO 2013 Staff (Problem Selection, Coordinator) |
| Endi | Reka | 2018: EGMO 2018 Staff (Guide: Czechia, Hungary) |
| Megi | Reka | 2018: Albania (Contestant 3: Honourable Mention), 2020: Albania (Contestant 1), 2021: Albania (Contestant 1) |
| Lucija | Relić | 2023: Croatia (Deputy Leader), 2025: Croatia (Deputy Leader) |
| Erina | Rexha | 2025: EGMO 2025 Staff (Guide: Greece) |
| Erjon | Rexha | 2025: EGMO 2025 Staff (Guide: Slovenia) |
| Kron | Rexhepi | 2025: EGMO 2025 Staff (Guide: Romania) |
| Nayeli | Reyes Moreno | 2014: Mexico (Contestant 3: Bronze Medal) |
| Diana | Reznychenko | 2024: Germany (Contestant 4), 2025: Germany (Contestant 4: Bronze Medal) |
| Celina | Rhonheimer | 2017: EGMO 2017 Staff (Guide: Finland, Ukraine) |
| Maria Chiara | Ricciuti | 2016: Italy (Contestant 2: Silver Medal), 2017: Italy (Contestant 2: Bronze Medal), 2018: Italy (Contestant 4: Bronze Medal) |
| Vittoria | Ricciuti | 2015: Italy (Contestant 4: Honourable Mention) |
| Katya | Richards | 2012: United Kingdom (Contestant 4: Bronze Medal), 2013: United Kingdom (Contestant 3: Honourable Mention), 2014: United Kingdom (Contestant 2: Silver Medal) |
| Elisabeth | Richardson | 2012: EGMO 2012 Staff (Guide: Poland, Türkiye) |
| Kit | Richardson | 2021: United Kingdom (Observer with Contestants) |
| Urška | Rihtaršič | 2023: EGMO 2023 Staff (Organiser) |
| Esther | Rimmelspacher | 2019: Germany (Contestant 3: Bronze Medal) |
| Julia | Rintala | 2025: Finland (Contestant 3) |
| Jara | Risco Martín | 2023: Spain (Contestant 4) |
| Lucia | Risnoveanu | 2020: Romania (Contestant 2: Bronze Medal), 2021: Romania (Contestant 3: Gold Medal), 2022: Romania (Contestant 3: Silver Medal) |
| Darta | Rituma | 2013: Latvia (Contestant 3), 2015: Latvia (Contestant 2) |
| Julio Armando | Rivera Dumani | 2016: Ecuador (Leader), 2017: Ecuador (Leader), 2018: Ecuador (Leader) |
| Francesca | Rizzo | 2016: Italy (Contestant 3: Bronze Medal), 2017: Italy (Contestant 3: Silver Medal), 2018: EGMO 2018 Staff (Staff), 2019: Italy (Leader), 2020: Italy (Leader), 2021: Italy (Leader), 2022: Italy (Leader), 2024: Italy (Leader) |
| Hannah | Roberts | 2012: EGMO 2012 Staff (Staff), 2013: United Kingdom (Leader), 2014: United Kingdom (Leader) |
| Ionuţ | Robicek | 2016: EGMO 2016 Staff (Staff) |
| Ángela | Rodríguez-Izquierdo Gallardo | 2019: Spain (Contestant 3: Honourable Mention) |
| Anna Priegel | Rødtjer | 2025: Denmark (Contestant 2) |
| Sofie Lindgaard | Roed | 2021: Denmark (Contestant 4) |
| Maarten | Roelofsma | 2014: Netherlands (Deputy Leader) |
| Mariami | Rogava | 2016: Georgia (Contestant 2: Bronze Medal), 2017: Georgia (Contestant 1: Bronze Medal) |
| Sofía | Rojas | 2019: Chile (Contestant 3) |
| María Cecilia | Rojas Cuadra | 2014: Mexico (Contestant 1: Bronze Medal), 2015: Mexico (Contestant 1: Silver Medal) |
| Iryna | Romaniuk | 2023: Ukraine (Contestant 3: Silver Medal) |
| Barbara | Roos | 2014: Switzerland (Contestant 2), 2017: EGMO 2017 Staff (Guide: Poland) |
| Siiri | Roschier | 2022: Finland (Contestant 2), 2023: Finland (Contestant 2: Honourable Mention), 2024: Finland (Contestant 2: Bronze Medal) |
| Astrid Kildelund | Rosenkilde | 2019: Denmark (Contestant 4) |
| Kirsten | Rosenkilde | 2019: Denmark (Leader), 2020: Denmark (Leader), 2021: Denmark (Leader), 2022: Denmark (Leader), 2023: Denmark (Leader), 2024: Denmark (Leader), 2025: Denmark (Leader) |
| Linus | Rösler | 2017: Switzerland B (Leader) |
| Alain | Rossier | 2017: EGMO 2017 Staff (Coordinator) |
| Lucie | Roth | 2017: EGMO 2017 Staff (Guide: Norway) |
| Radmila | Rouda | 2015: EGMO 2015 Staff (Guide: Serbia) |
| Alice | Rousseau | 2018: EGMO 2018 Staff (Guide: France) |
| Anna | Rouva | 2025: Cyprus (Contestant 2) |
| Giulio | Rovellini | 2018: EGMO 2018 Staff (Guide: United States of America) |
| Lubing | Ruan | 2020: Austria (Contestant 3) |
| Celia | Rubio Madrigal | 2017: Spain (Contestant 3), 2022: Spain (Deputy Leader), 2023: EGMO 2023 Staff (IT), 2024: EGMO 2024 Staff (IT), 2025: EGMO 2025 Staff (IT) |
| Bogdan | Rublov | 2018: Ukraine (Observer with Leader), 2020: Ukraine (Observer with Leader), 2023: Ukraine (Observer with Leader), 2024: Ukraine (Observer with Leader), 2025: Ukraine (Observer with Leader) |
| Anastasiia | Rudenko | 2018: Ukraine (Contestant 4) |
| Oleksandr | Rudenko | 2015: EGMO 2015 Staff (Coordinator), 2022: United States of America (Deputy Leader) |
| Anastasia | Rudnytska | 2019: EGMO 2019 Staff (Guide: Türkiye) |
| Ina | Rudovich | 2015: Belarus (Contestant 3: Honourable Mention) |
| Sergei | Rudy | 2015: EGMO 2015 Staff (Organization Committee) |
| Samantha | Ruelas Valtierra | 2021: Mexico (Contestant 4: Bronze Medal) |
| Anja | Rupnik | 2023: EGMO 2023 Staff (Guide: Germany) |
| Nika | Rupnik | 2023: EGMO 2023 Staff (Guide: Saudi Arabia) |
| Philipp | Rupp | 2017: EGMO 2017 Staff (Leader Guide) |
| Paula | Russak | 2024: Estonia (Contestant 3: Honourable Mention), 2025: Estonia (Contestant 2: Honourable Mention) |
| Paul | Russell | 2012: EGMO 2012 Staff (Coordinator) |
| Galina | Rusu | 2020: Republic of Moldova (Leader), 2021: Republic of Moldova (Leader), 2025: Republic of Moldova (Leader) |
| Isabela | Ruthner Dorn | 2023: Brazil (Contestant 2: Honourable Mention), 2024: Brazil (Contestant 2: Silver Medal) |
| Loreta | Rutkovska | 2015: Latvia (Contestant 4) |
| Karolin | Ruumet | 2024: Estonia (Contestant 4) |
| Sofia | Ryabchun | 2021: Ukraine (Contestant 3: Bronze Medal) |
| Karyna | Rybalko | 2019: EGMO 2019 Staff (Guide: Switzerland) |
| Lydia | Rysavy | 2019: Austria (Contestant 4: Honourable Mention) |
| Anar | Rzayev | 2023: Azerbaijan (Deputy Leader) |
| Nada | Saaidia | 2015: Tunisia (Contestant 1) |
| Zenan | Šabanac | 2024: Bosnia and Herzegovina (Deputy Leader) |
| Nour Elhouda | Sabbagh | 2015: Tunisia (Contestant 2) |
| Aruzhan | Sabyrbek | 2017: Kazakhstan (Contestant 4: Bronze Medal), 2019: Kazakhstan (Contestant 4: Bronze Medal) |
| Veronica | Sacchi | 2017: Italy (Contestant 4: Bronze Medal), 2018: EGMO 2018 Staff (Staff), 2019: Italy (Deputy Leader), 2020: Italy (Deputy Leader), 2021: Italy (Deputy Leader), 2022: Italy (Deputy Leader), 2023: Italy (Leader), 2024: Italy (Deputy Leader), 2025: Italy (Leader) |
| Carmen | Săcuiu | 2016: EGMO 2016 Staff (Invigilator) |
| Urtina | Sada | 2025: EGMO 2025 Staff (Guide: Canada) |
| Amina | Sadykova | 2021: Tajikistan (Contestant 3) |
| Mariel | Sáez | 2019: Chile (Deputy Leader) |
| Shemsi | Safarov | 2016: Azerbaijan (Leader) |
| Narmin | Safarova | 2016: Azerbaijan (Observer with Leader) |
| Alina | Safiullina | 2020: Russian Federation (Leader), 2021: Russian Federation (Leader) |
| Mirjam | Sager | 2017: EGMO 2017 Staff (Media) |
| Mehmet A. | Şahin | 2014: EGMO 2014 Staff (Coordinator) |
| Vempalli | Sai Keerthana | 2019: India (Contestant 2: Bronze Medal) |
| Tsogzolmaa | Saizmaa | 2023: Mongolia (Deputy Leader), 2024: Mongolia (Deputy Leader), 2025: Mongolia (Deputy Leader) |
| Francesco | Sala | 2018: EGMO 2018 Staff (Problem Selection) |
| Ina | Salauyova | 2015: EGMO 2015 Staff (Guide: Bulgaria) |
| Gladys Alekza | Salazar | 2018: Peru (Contestant 1: Silver Medal), 2019: Peru (Contestant 3: Silver Medal), 2021: Peru (Observer with Leader) |
| Gregorio | Salazar | 2024: Colombia (Leader) |
| María José | Salazar Macías | 2022: Ecuador (Contestant 3) |
| Ingrid Verónica | Salazar Picado | 2017: Costa Rica (Contestant 3), 2018: Costa Rica (Contestant 2), 2019: Costa Rica (Contestant 1) |
| Ana | Saldadze | 2024: EGMO 2024 Staff (Guide: Netherlands) |
| Joud | Saleh | 2015: Saudi Arabia (Contestant 4: Honourable Mention), 2016: Saudi Arabia (Contestant 4: Bronze Medal), 2017: Saudi Arabia (Contestant 2: Silver Medal), 2018: Saudi Arabia (Contestant 3: Silver Medal) |
| Tofiq | Saleh | 2016: Saudi Arabia (Observer with Contestants), 2018: Saudi Arabia (Observer with Contestants) |
| Luana | Salihu | 2025: EGMO 2025 Staff (Guide: Sri Lanka) |
| Diyora | Salimova | 2017: EGMO 2017 Staff (Coordinator), 2020: EGMO 2020 Staff (Coordinator) |
| Linda | Sallam | 2024: Saudi Arabia (Observer with Contestants) |
| Pavel | Šalom | 2021: Czechia (Leader), 2022: Czechia (Leader), 2023: Czechia (Leader), 2024: Czechia (Deputy Leader), 2025: Czechia (Leader) |
| Julia | Saltiel | 2017: Brazil (Contestant 2: Honourable Mention) |
| Halh | Samargandi | 2015: Saudi Arabia (Observer with Contestants), 2016: Saudi Arabia (Observer with Contestants), 2017: Saudi Arabia (Observer with Contestants) |
| Samerah | Samargandy | 2018: Saudi Arabia (Observer with Contestants), 2019: Saudi Arabia (Observer with Contestants), 2020: Saudi Arabia (Observer with Contestants) |
| Tatiana | Samrowski | 2017: EGMO 2017 Staff (Logistics) |
| Alexander | Samuilich | 2015: EGMO 2015 Staff (Organization Committee) |
| Marina | Samusenko | 2019: EGMO 2019 Staff (Guide Team Lead) |
| Nixa | Sanchez | 2018: Peru (Contestant 4) |
| Nicolae | Sanda | 2016: EGMO 2016 Staff (Staff) |
| Victoria | Sandí Barrantes | 2022: Costa Rica (Contestant 4) |
| Sanja | Sandić | 2023: EGMO 2023 Staff (Organiser) |
| Stephanie | Sandoval Camacho | 2021: Costa Rica (Contestant 4) |
| Elise | Sänger | 2014: Netherlands (Contestant 2), 2015: Netherlands (Contestant 4: Honourable Mention), 2020: EGMO 2020 Staff (Organiser) |
| Gabriella | Santana Morgado | 2021: Brazil (Contestant 2: Bronze Medal), 2022: Brazil (Contestant 3: Bronze Medal), 2025: Brazil (Deputy Leader) |
| Sofía Constanza | Santisteban Dávila | 2025: Mexico (Contestant 3: Honourable Mention) |
| Vitória Aparecida | Santos Ferreira | 2024: Brazil (Deputy Leader), 2025: Brazil (Leader) |
| Davide | Sapienza | 2018: EGMO 2018 Staff (Guide: Peru) |
| Sylwia | Sapkowska | 2024: Poland (Contestant 4: Silver Medal) |
| Nancy | Saravia | 2018: Peru (Deputy Leader) |
| Mariya | Sardarli | 2021: Canada (Leader), 2022: Canada (Leader) |
| Anđela | Šarković | 2013: Serbia (Contestant 1: Gold Medal), 2014: Serbia (Contestant 1: Gold Medal), 2015: Serbia (Contestant 1: Gold Medal), 2020: EGMO 2020 Staff (Coordinator), 2023: EGMO 2023 Staff (Coordinator), 2024: EGMO 2024 Staff (Coordinator) |
| Maria | Sas | 2016: EGMO 2016 Staff (Staff) |
| Uladzislau | Sataneuski | 2015: EGMO 2015 Staff (Problem Selection, Coordinator) |
| Mark | Saul | 2015: United States of America (Observer with Leader), 2019: EGMO 2019 Staff (Coordinator) |
| Dovilė | Saunorytė | 2025: Lithuania (Contestant 2) |
| Kornelija | Savickė | 2024: Lithuania (Contestant 1) |
| Emanoil | Savin | 2016: EGMO 2016 Staff (Staff) |
| Artemis-Chrysanthi | Savva | 2019: Greece (Contestant 4: Bronze Medal) |
| Andreas | Savvidis | 2019: Cyprus (Deputy Leader) |
| Saltanat | Sayidova | 2022: Tajikistan (Contestant 3) |
| Pierre | Schatz | 2022: Ireland (Deputy Leader) |
| Carl | Schildkraut | 2025: EGMO 2025 Staff (Problem Selection) |
| Birgit Vera | Schmidt | 2018: Austria (Leader), 2020: Austria (Leader), 2023: EGMO 2023 Staff (Coordinator) |
| Jennifer | Schmitz | 2017: EGMO 2017 Staff (Invigilator) |
| Janina | Schneeweiss | 2022: Austria (Contestant 2) |
| Alice | Schneider | 2025: Brazil (Contestant 1: Silver Medal) |
| Linda | Schouten | 2020: EGMO 2020 Staff (Organiser) |
| Jakob | Schrader | 2023: EGMO 2023 Staff (Guide: Estonia) |
| Philippe | Schram | 2019: Luxembourg (Deputy Leader) |
| Veronika | Schreitter | 2018: Austria (Contestant 2: Bronze Medal), 2019: Austria (Deputy Leader), 2020: Austria (Deputy Leader), 2021: Austria (Leader), 2022: Austria (Leader) |
| Eljakim | Schrijvers | 2020: EGMO 2020 Staff (Crew) |
| Yaara | Schulman | 2021: Israel (Contestant 3: Silver Medal), 2022: Israel (Contestant 3: Bronze Medal), 2023: Israel (Contestant 2: Silver Medal) |
| Sandra | Schumann | 2023: Estonia (Leader) |
| Dan | Schwarz | 2012: Romania (Leader), 2013: Romania (Leader), 2014: Romania (Leader) |
| Elisabeth | Schwarz | 2013: Norway (Contestant 4: Honourable Mention) |
| Michel | Sebille | 2012: Belgium (Leader), 2013: Belgium (Leader), 2014: Belgium (Leader), 2015: Belgium (Leader), 2016: Belgium (Leader), 2017: Belgium (Leader), 2018: Belgium (Leader), 2019: Belgium (Leader), 2020: Belgium (Leader), 2021: Belgium (Leader), 2022: Belgium (Leader), 2023: Belgium (Leader), 2024: Belgium (Leader), 2025: Belgium (Leader) |
| Gregor | Šega | 2023: EGMO 2023 Staff (Coordinator) |
| Saaji | Sehnai | 2025: Bangladesh (Contestant 2) |
| Annegret | Seibt | 2018: Germany (Contestant 3: Honourable Mention) |
| Paul | Seidel | 2017: EGMO 2017 Staff (Logistics) |
| Marie-Noelle | Seif Asskar | 2022: Syria (Contestant 2: Bronze Medal) |
| Andi | Sejdiu | 2025: EGMO 2025 Staff (Coordinator) |
| Ilgın | Şekerli | 2024: Türkiye (Contestant 3: Bronze Medal), 2025: Türkiye (Contestant 3: Silver Medal) |
| Tamara | Sekularac | 2013: Serbia (Contestant 2: Silver Medal) |
| Dalmat | Selimi | 2025: EGMO 2025 Staff (Guide: Norway) |
| Qendresa | Selimi | 2019: North Macedonia (Contestant 2: Honourable Mention) |
| Rigena | Sema | 2018: Albania (Deputy Leader) |
| Aliaksei | Semchankau | 2015: EGMO 2015 Staff (Coordinator) |
| Eva | Seme | 2016: Slovenia (Contestant 3) |
| Lara | Semeš | 2021: Croatia (Contestant 4), 2023: Croatia (Contestant 4: Bronze Medal), 2024: Croatia (Contestant 4: Gold Medal) |
| Ayşe Zehra | Şen | 2021: Türkiye (Contestant 3: Bronze Medal) |
| Alena | Senchanka | 2013: Belarus (Deputy Leader), 2014: Belarus (Deputy Leader), 2015: EGMO 2015 Staff (Organization Committee), 2016: Belarus (Deputy Leader), 2017: Belarus (Deputy Leader), 2018: Belarus (Deputy Leader), 2021: Belarus (Deputy Leader) |
| Sara | Sendarrubias Arias-Camisón | 2018: Spain (Contestant 4) |
| Uma | Senta | 2025: Bosnia and Herzegovina (Contestant 4: Honourable Mention) |
| Neja | Seražin | 2023: EGMO 2023 Staff (Guide: Slovakia) |
| Dinu | Şerbănescu | 2016: EGMO 2016 Staff (Problem Selection) |
| Yaroslava | Serdiuk | 2012: Ukraine (Contestant 1: Silver Medal), 2019: EGMO 2019 Staff (Coordinator) |
| Elvira | Serdțevoi | 2014: Republic of Moldova (Contestant 2), 2015: Republic of Moldova (Contestant 2: Bronze Medal), 2016: Republic of Moldova (Contestant 3: Bronze Medal), 2017: Republic of Moldova (Contestant 2: Honourable Mention) |
| Filip | Serea | 2016: EGMO 2016 Staff (Guide: Belgium) |
| Laura | Șestacov | 2023: Republic of Moldova (Contestant 1: Honourable Mention), 2024: Republic of Moldova (Contestant 2), 2025: Republic of Moldova (Contestant 1: Bronze Medal) |
| Lies | Sevenhant | 2022: Belgium (Contestant 4) |
| Swetlana | Shaban | 2015: Belarus (Contestant 4: Honourable Mention), 2016: Belarus (Contestant 3: Bronze Medal) |
| Anisa | Shabani | 2024: Kosovo (Contestant 4), 2025: Kosovo (Contestant 3) |
| Armend | Shabani | 2022: Kosovo (Leader), 2024: EGMO 2024 Staff (Coordinator, EGMO Board) |
| Bulëza | Shabiu | 2025: EGMO 2025 Staff (Guide: Uzbekistan) |
| Ishika | Shah | 2019: United States of America (Contestant 2: Gold Medal) |
| Kiah | Shah | 2025: Luxembourg (Contestant 1: Honourable Mention) |
| Armela | Shahini | 2022: Albania (Contestant 1) |
| Nerissa | Shakespeare | 2018: Finland (Contestant 3: Honourable Mention), 2019: Finland (Contestant 3) |
| Alexandr | Shakiyev | 2022: Kazakhstan (Deputy Leader), 2023: Kazakhstan (Leader), 2024: Kazakhstan (Deputy Leader) |
| Besfort | Shala | 2023: Kosovo (Leader), 2024: Kosovo (Leader), 2025: EGMO 2025 Staff (Problem Selection Chair, Coordinator) |
| Nini | Shalamberidze | 2024: EGMO 2024 Staff (Guide: Bosnia and Herzegovina) |
| Anastasiia | Shaposhnyk | 2019: EGMO 2019 Staff (Guide: Belarus) |
| Vladimir | Shapurov | 2015: EGMO 2015 Staff (Organization Committee) |
| Haris | Shaqiri | 2025: EGMO 2025 Staff (Guide: Ukraine) |
| Olexandra | Sharapa | 2019: EGMO 2019 Staff (Guide: Canada) |
| Irina | Sharkova | 2013: Bulgaria (Deputy Leader), 2014: Bulgaria (Deputy Leader) |
| Mehrona | Sharopova | 2021: Tajikistan (Contestant 1), 2022: Tajikistan (Contestant 2: Honourable Mention) |
| Nino | Sharvashidze | 2024: EGMO 2024 Staff (Guide: Croatia) |
| Kseniya | Shastakova | 2020: Belarus (Contestant 1: Silver Medal), 2021: Belarus (Contestant 2: Gold Medal) |
| Thanom | Shaw | 2018: Australia (Leader), 2019: Australia (Leader), 2020: Australia (Leader), 2021: Australia (Leader), 2022: Australia (Leader) |
| Natallia | Shchahlova | 2020: Belarus (Deputy Leader) |
| Daria | Shchedrina | 2019: EGMO 2019 Staff (Coordinator), 2022: EGMO 2022 Staff (Coordinator) |
| Mykyta | Shchehlov | 2019: EGMO 2019 Staff (Coordinator) |
| Jona | Shefkiu | 2024: Kosovo (Contestant 3), 2025: Kosovo (Contestant 1: Honourable Mention) |
| Tarek Salama | Shehata | 2017: Saudi Arabia (Deputy Leader), 2018: Saudi Arabia (Deputy Leader), 2019: Saudi Arabia (Observer with Leader), 2020: Saudi Arabia (Observer with Leader), 2021: Saudi Arabia (Deputy Leader), 2022: Saudi Arabia (Deputy Leader), 2023: Saudi Arabia (Deputy Leader), 2024: Saudi Arabia (Leader) |
| Anda | Shehu | 2014: Albania (Deputy Leader) |
| Bobby | Shen | 2025: EGMO 2025 Staff (Coordinator) |
| Laura | Sheshi | 2016: Albania (Contestant 3) |
| Olha | Shevchenko | 2016: Ukraine (Contestant 1: Bronze Medal), 2017: Ukraine (Contestant 1: Gold Medal), 2019: EGMO 2019 Staff (Coordinator), 2020: EGMO 2020 Staff (Coordinator) |
| Yuika | Shimo | 2015: Japan (Contestant 4: Bronze Medal) |
| Hirotomo | Shinoki | 2018: Japan (Observer with Leader) |
| Madison | Shirazi | 2019: France (Contestant 4) |
| Anastasiia | Shkaraputa | 2019: EGMO 2019 Staff (Guide: Japan) |
| Bruna Arisa | Shoji Nakamura | 2019: Brazil (Contestant 3), 2021: Brazil (Contestant 1: Bronze Medal) |
| Vinayak Madhav | Sholapurkar | 2016: India (Leader) |
| Jack | Shotton | 2012: EGMO 2012 Staff (Coordinator) |
| Liana | Shpani | 2016: Albania (Contestant 4) |
| Andrea | Shui | 2012: Ireland (Contestant 3) |
| Oleksandr | Shumaiev | 2019: EGMO 2019 Staff (Coordinator) |
| Stefaniya | Shuturminskaya | 2024: Belarus (Contestant 3: Silver Medal) |
| Alua | Shyntay | 2017: Kazakhstan (Contestant 2: Silver Medal), 2018: Kazakhstan (Contestant 2: Silver Medal) |
| Togzhan | Shyntay | 2020: Kazakhstan (Contestant 4: Silver Medal) |
| Raisa | Sidorenko | 2015: EGMO 2015 Staff (Deputy Chairman OC) |
| Anna | Siennicka | 2012: Poland (Contestant 4: Silver Medal) |
| Katarzyna | Siennicka | 2014: Poland (Contestant 4: Bronze Medal) |
| Pārsla Esmeralda | Sietiņa | 2012: Latvia (Contestant 4), 2013: Latvia (Contestant 4), 2014: Latvia (Contestant 1), 2020: Latvia (Deputy Leader), 2021: Latvia (Leader), 2022: Latvia (Leader), 2023: Latvia (Leader, EGMO Board), 2024: Latvia (Leader, EGMO Board), 2025: Latvia (Leader, EGMO Board) |
| Ana-Maria | Sikharulidze | 2024: EGMO 2024 Staff (Guide: People's Republic of China) |
| Kristina | Silađi | 2015: Serbia (Contestant 4: Bronze Medal) |
| Olivine | Silier | 2018: France (Contestant 4: Bronze Medal) |
| Olha | Silina | 2015: Ukraine (Contestant 4: Silver Medal), 2016: Ukraine (Contestant 2: Gold Medal) |
| Sandra | Silina | 2019: Latvia (Contestant 2), 2020: Latvia (Contestant 1: Bronze Medal) |
| Svatava | Šimečková | 2025: Czechia (Contestant 4: Silver Medal) |
| Radu | Simion | 2016: EGMO 2016 Staff (Coordinator, Staff) |
| Zsófi Karolin | Simon | 2022: EGMO 2022 Staff (Guide: Germany) |
| Sanja | Simonovikj | 2015: The former Yugoslav Republic of Macedonia (Contestant 1: Honourable Mention), 2016: The former Yugoslav Republic of Macedonia (Contestant 1) |
| Berfin | Şimşek | 2012: Türkiye (Contestant 4: Gold Medal), 2013: Türkiye (Contestant 4: Gold Medal), 2014: Türkiye (Deputy Leader) |
| Valentina | Sinaj | 2020: Albania (Deputy Leader), 2021: Albania (Deputy Leader) |
| Pulkit | Sinha | 2022: India (Deputy Leader) |
| Katarina | Šipec | 2023: EGMO 2023 Staff (Guide: Brazil) |
| Jože | Sirotka | 2023: EGMO 2023 Staff (Guide) |
| Malik | Sitamov | 2021: Tajikistan (Deputy Leader), 2023: Tajikistan (Leader) |
| Karen | Situ | 2018: Canada (Contestant 4: Honourable Mention) |
| Klemen | Šivic | 2023: EGMO 2023 Staff (Problem Selection Chair) |
| Helena | Skaza Birk | 2023: EGMO 2023 Staff (Senior Guide) |
| Lejla | Skelić | 2017: Bosnia and Herzegovina (Contestant 4: Honourable Mention), 2018: Bosnia and Herzegovina (Contestant 2: Honourable Mention), 2019: Bosnia and Herzegovina (Contestant 1: Silver Medal) |
| Anna | Skiridova | 2019: EGMO 2019 Staff (Guide Team Lead) |
| Ingunn | Skoglund | 2023: Norway (Contestant 4: Honourable Mention) |
| Andreas | Skotinos | 2016: Cyprus (Leader), 2021: Cyprus (Deputy Leader) |
| Ema | Skottova | 2019: Switzerland (Contestant 2), 2020: Switzerland (Contestant 1: Bronze Medal), 2021: Switzerland (Contestant 1: Bronze Medal) |
| Tereza | Škublová | 2020: Slovakia (Contestant 4: Honourable Mention), 2021: Slovakia (Contestant 4: Bronze Medal) |
| Daina | Škuškovnika | 2016: Latvia (Deputy Leader) |
| Juris | Škuškovniks | 2012: Latvia (Leader), 2013: Latvia (Leader), 2014: Latvia (Leader), 2015: Latvia (Leader), 2016: Latvia (Leader), 2017: Latvia (Leader), 2018: Latvia (Leader), 2019: Latvia (Leader), 2023: Latvia (Deputy Leader) |
| Nikita | Skybytskyi | 2019: EGMO 2019 Staff (Coordinator) |
| Anna Margrete | Sletsjøe | 2016: Norway (Contestant 2) |
| Juliette | Sleurs | 2019: Belgium (Contestant 3) |
| Azhar | Smagulova | 2017: Kazakhstan (Contestant 3: Honourable Mention) |
| Sara | Smajić | 2023: Bosnia and Herzegovina (Contestant 4: Bronze Medal), 2024: Bosnia and Herzegovina (Contestant 2: Honourable Mention), 2025: Bosnia and Herzegovina (Contestant 2: Bronze Medal) |
| Maša | Smajila | 2016: Slovenia (Contestant 4), 2023: EGMO 2023 Staff (Guide: Spain) |
| Nare | Smbatyan | 2025: Armenia (Contestant 3: Bronze Medal) |
| Roksolana | Smerechynska | 2019: EGMO 2019 Staff (Guide Team Lead) |
| Mihaela | Smilevska | 2025: North Macedonia (Contestant 3) |
| Denys | Smirnov | 2019: EGMO 2019 Staff (Coordinator) |
| Vlada | Smirnova | 2018: EGMO 2018 Staff (Guide: Kazakhstan, Ukraine) |
| Andrew | Smith | 2021: Ireland (Leader) |
| Geoffrey | Smith | 2012: EGMO 2012 Staff (Jury Chair, EGMO Committee, Problem Selection Chair), 2013: EGMO 2013 Staff (EGMO AB, Coordinator), 2014: EGMO 2014 Staff (EGMO AB, Coordinator), 2016: EGMO 2016 Staff (Problem Selection, Coordinator, EGMO AB), 2017: EGMO 2017 Staff (Coordinator, EGMO AB), 2018: EGMO 2018 Staff (EGMO AB), 2020: EGMO 2020 Staff (Coordinator), 2023: EGMO 2023 Staff (Coordinator, Problem Selection), 2024: EGMO 2024 Staff (Problem Selection, Coordinator), 2025: EGMO 2025 Staff (Problem Selection, Coordinator) |
| Josie | Smith | 2012: EGMO 2012 Staff (Guide: Indonesia, Netherlands), 2025: New Zealand (Leader) |
| Ema | Smolič | 2023: EGMO 2023 Staff (Staff) |
| Sophia | Smyrli | 2021: Cyprus (Contestant 4) |
| Nina | Snigireva | 2018: Ireland (Leader) |
| Hanne | Snijders | 2019: Netherlands (Contestant 4: Bronze Medal), 2020: Netherlands (Contestant 4: Bronze Medal) |
| Daminika | Sobal | 2022: Spain (Contestant 4) |
| Bolormaa | Sodgerel | 2022: Mongolia (Contestant 4: Honourable Mention) |
| Irina | Sofronova | 2017: Bulgaria (Contestant 2: Bronze Medal) |
| Saniva Rakib | Soha | 2023: Bangladesh (Contestant 2: Bronze Medal), 2024: Bangladesh (Contestant 4: Honourable Mention), 2025: Bangladesh (Contestant 1: Honourable Mention) |
| Prashant | Sohani | 2020: India (Deputy Leader) |
| Safa | Sokkah | 2023: Tunisia (Contestant 1) |
| Olivér | Sokvári | 2022: EGMO 2022 Staff (Guide: Lithuania) |
| Anastasia | Solea | 2022: Cyprus (Deputy Leader) |
| Julia | Sollberger | 2019: Switzerland (Contestant 3: Honourable Mention), 2020: Switzerland (Contestant 2), 2021: Switzerland (Deputy Leader), 2022: Switzerland (Leader), 2023: Switzerland (Leader) |
| Yuliya | Solodovnykova | 2017: EGMO 2017 Staff (Guide: Belarus) |
| Romina | Som | 2014: Switzerland (Contestant 3), 2017: EGMO 2017 Staff (Guide: Ireland, United Kingdom) |
| Dalma | Somogyi | 2022: Hungary B (Contestant 2: Silver Medal) |
| Noémi | Somorjai | 2022: EGMO 2022 Staff (Guide: Hungary B) |
| Aleksandra | Sonina | 2016: Russian Federation (Contestant 2: Silver Medal) |
| Mehmet | Sönmez | 2014: EGMO 2014 Staff (Coordinator) |
| Ovidiu | Şontea | 2016: EGMO 2016 Staff (Staff) |
| Máté | Soós | 2022: EGMO 2022 Staff (Guide: Latvia) |
| Camilla Lund | Søraas | 2024: Norway (Observer with Contestants), 2025: Norway (Observer with Contestants) |
| Victoria Lund | Søraas | 2024: Norway (Contestant 4), 2025: Norway (Contestant 1) |
| Lovise | Sørby | 2019: Norway (Contestant 3) |
| Vasile Sebastian | Soreanu | 2016: EGMO 2016 Staff (Guide: Netherlands) |
| Yevheniia | Soroka | 2019: EGMO 2019 Staff (Coordinator) |
| Maria | Sorotnik | 2015: EGMO 2015 Staff (Organization Committee) |
| Cristina Irene | Sotomayor Vivas | 2017: Mexico (Contestant 4: Bronze Medal), 2020: Mexico (Observer with Leader), 2021: Mexico (Leader) |
| Klelia | Sourmeli Skotinou | 2016: Cyprus (Deputy Leader) |
| Vladimira | Souvandjieva | 2013: Bulgaria (Contestant 4: Silver Medal) |
| Juliana | Souza | 2017: Brazil (Contestant 4) |
| Stefania | Spachou | 2022: Greece (Contestant 3), 2023: Greece (Contestant 3) |
| Maryna | Spektrova | 2023: Ukraine (Contestant 4: Silver Medal), 2024: Ukraine (Contestant 3: Gold Medal) |
| Tamsin | Spelman | 2012: EGMO 2012 Staff (Invigilator) |
| Markus | Sprecher | 2017: EGMO 2017 Staff (Problem Selection, Coordinator) |
| Janina | Sprînceană | 2016: EGMO 2016 Staff (Invigilator) |
| Daniela | Spurtacz | 2022: Poland (Contestant 4: Gold Medal), 2023: Poland (Contestant 3: Gold Medal) |
| Patrick | Stalder | 2020: Switzerland (Leader) |
| Vasiliki | Stamatelou | 2022: Greece (Contestant 4: Honourable Mention) |
| Lavinia | Stanislav | 2016: EGMO 2016 Staff (Guide: India) |
| Merlijn | Staps | 2017: Netherlands (Deputy Leader), 2020: EGMO 2020 Staff (Problem Selection Chair) |
| Bora | Starja | 2014: Albania (Contestant 3) |
| Anna | Starodubtseva | 2019: EGMO 2019 Staff (Guide: Poland) |
| Diāna | Stecka | 2024: Latvia (Contestant 4: Honourable Mention), 2025: Latvia (Contestant 2: Bronze Medal) |
| Esther | Steenkamer | 2016: Netherlands (Contestant 3: Bronze Medal), 2017: Netherlands (Contestant 4: Bronze Medal) |
| Doru | Ştefănescu | 2016: EGMO 2016 Staff (Staff) |
| Margarita | Stefanova | 2019: Bulgaria (Contestant 2: Silver Medal), 2020: Bulgaria (Contestant 3: Silver Medal), 2021: Bulgaria (Contestant 1: Bronze Medal) |
| Zlata | Stefanović | 2022: Serbia (Contestant 1: Honourable Mention) |
| Irène | Steinegger | 2015: Switzerland (Observer with Leader) |
| Raphael | Steiner | 2012: Switzerland (Deputy Leader), 2017: EGMO 2017 Staff (Problem Selection, Coordinator) |
| Corinna | Stemmer | 2017: EGMO 2017 Staff (Deputy Chief Guide) |
| Agata | Stępińska | 2023: Poland (Contestant 4: Bronze Medal) |
| Timen | Stepišnik Perdih | 2023: EGMO 2023 Staff (Guide: Georgia) |
| Matija | Stibilj | 2023: EGMO 2023 Staff (Guide: Republic of Moldova) |
| Cezar-Corneliu | Stoica | 2016: EGMO 2016 Staff (IT) |
| Tea | Stoilkovska | 2015: The former Yugoslav Republic of Macedonia (Contestant 2), 2016: The former Yugoslav Republic of Macedonia (Contestant 2) |
| Miloš | Stojaković | 2013: Serbia (Leader), 2014: Serbia (Leader), 2015: Serbia (Leader), 2016: Serbia (Leader), 2017: Serbia (Leader), 2018: Serbia (Leader), 2019: Serbia (Leader), 2020: Serbia (Leader), 2021: Serbia (Leader), 2022: Serbia (Leader), 2023: Serbia (Leader), 2024: Serbia (Leader) |
| Nevena | Stojković | 2021: Serbia (Contestant 3: Bronze Medal), 2022: Serbia (Contestant 4: Bronze Medal) |
| Nik | Stopar | 2023: EGMO 2023 Staff (Problem Selection) |
| Bojan | Štorman | 2023: EGMO 2023 Staff (Staff) |
| Tatjana | Štorman | 2023: EGMO 2023 Staff (Senior Guide) |
| Timeja | Strašek | 2015: Slovenia (Contestant 4: Honourable Mention) |
| Julia | Strekopytov | 2025: United Kingdom (Contestant 2: Honourable Mention) |
| Ioana | Stroe | 2025: Romania (Contestant 1: Bronze Medal) |
| Elza | Strumpe | 2023: Latvia (Contestant 2), 2024: Latvia (Contestant 3) |
| Marta | Strzelecka | 2016: Poland (Deputy Leader) |
| Laura | Stuart | 2024: Australia (Observer with Contestants) |
| Ana Beatriz | Studart | 2018: Brazil (Contestant 1: Silver Medal), 2019: Brazil (Contestant 2: Bronze Medal), 2020: Brazil (Contestant 1: Silver Medal), 2021: Brazil (Deputy Leader) |
| Alevtina | Studenikina | 2016: United Kingdom (Contestant 3: Bronze Medal), 2017: United Kingdom (Contestant 4: Bronze Medal), 2018: United Kingdom (Contestant 3: Silver Medal) |
| Livia | Studer | 2017: EGMO 2017 Staff (Guide: Albania) |
| Nina | Stumpf | 2017: EGMO 2017 Staff (Guide: Czechia) |
| Pascal | Su | 2017: EGMO 2017 Staff (Problem Selection, Coordinator) |
| Sihan | Su | 2023: People's Republic of China (Contestant 3: Gold Medal) |
| Pablo | Suárez Vieites | 2018: EGMO 2018 Staff (Guide: Bolivia, Brazil) |
| S. M. Vinuthi Lohansa | Subasinghe | 2025: Sri Lanka (Contestant 3) |
| Kristie | Sue | 2023: United States of America (Contestant 2: Gold Medal), 2024: United States of America (Contestant 4: Gold Medal) |
| Haruna | Sueo | 2016: Japan (Contestant 3: Honourable Mention) |
| Kirill | Sukhov | 2020: Russian Federation (Observer with Leader) |
| Fatih | Sulak | 2014: EGMO 2014 Staff (Coordinator) |
| Irakli | Sulamanidze | 2024: EGMO 2024 Staff (Guide: Slovenia) |
| Keti | Sulamanidze | 2019: Georgia (Contestant 3: Honourable Mention) |
| Olivia | Sun | 2025: Australia (Contestant 3: Gold Medal) |
| Sarah | Sun | 2018: Canada (Deputy Leader), 2019: Canada (Deputy Leader) |
| Tianyue | Sun | 2021: Finland (Contestant 3) |
| Aditi | Sunil Phadke | 2015: India (Observer with Contestants), 2022: India (Leader), 2023: India (Leader) |
| Carina Maria | Şupeală | 2016: EGMO 2016 Staff (Guide: France) |
| Margot | Sur-Cortier | 2025: France (Contestant 4: Silver Medal) |
| Balasubramanian | Sury | 2017: India (Deputy Leader) |
| Vida | Sušelj | 2025: Luxembourg (Contestant 2: Honourable Mention) |
| Nina | Šušić | 2023: Serbia (Contestant 1: Bronze Medal), 2024: Serbia (Contestant 1: Silver Medal) |
| Tjaša | Sušnik | 2021: Slovenia (Contestant 4) |
| Karolina | Susol | 2021: Ukraine (Contestant 4: Silver Medal) |
| Ambar Vanessa | Sutandar | 2014: Indonesia (Contestant 1: Bronze Medal) |
| Natasha | Sutedja | 2012: Indonesia (Contestant 2: Bronze Medal) |
| Benjamin | Suter | 2017: EGMO 2017 Staff (Staff) |
| Michaela | Svatošová | 2019: Czechia (Contestant 3: Honourable Mention), 2020: Czechia (Contestant 3: Honourable Mention) |
| Luka | Svenšek | 2023: EGMO 2023 Staff (Guide: Kazakhstan) |
| Nataliia | Sverdlova | 2019: EGMO 2019 Staff (Guide: Ukraine B) |
| Estere | Šverna | 2018: Latvia (Contestant 3: Honourable Mention) |
| Mariam | Svintradze | 2024: EGMO 2024 Staff (Guide: Colombia) |
| Jaroslav | Švrček | 2017: Czechia (Deputy Leader), 2018: Czechia (Deputy Leader), 2019: Czechia (Leader) |
| Michelle | Sweering | 2012: Netherlands (Contestant 3: Bronze Medal), 2013: Netherlands (Contestant 4: Silver Medal), 2014: Netherlands (Contestant 3: Gold Medal), 2017: EGMO 2017 Staff (Coordinator), 2020: EGMO 2020 Staff (Coordinator, Problem Selection), 2024: EGMO 2024 Staff (Coordinator), 2025: EGMO 2025 Staff (Problem Selection, Coordinator) |
| Muslim | Syaroni | 2014: EGMO 2014 Staff (Guide: Indonesia, Ireland) |
| Kateryna | Sydorenko | 2024: Ukraine (Contestant 4: Silver Medal), 2025: Ukraine (Contestant 4) |
| Nuria | Sydykova | 2017: Mexico (Contestant 3: Bronze Medal), 2018: Mexico (Contestant 1: Silver Medal), 2019: Mexico (Contestant 2: Silver Medal), 2022: Mexico (Deputy Leader) |
| Era | Syla | 2020: Kosovo (Contestant 2: Bronze Medal), 2021: Kosovo (Contestant 1: Silver Medal) |
| Achillefs | Synefakopoulos | 2019: Greece (Leader), 2020: Greece (Leader), 2022: Greece (Leader), 2023: Greece (Leader), 2024: Greece (Leader), 2025: Greece (Leader) |
| Kornel | Szabo | 2024: EGMO 2024 Staff (Coordinator), 2025: EGMO 2025 Staff (Coordinator) |
| Lili Kata | Szakács | 2022: EGMO 2022 Staff (Entertainment) |
| May | Szedlak | 2017: EGMO 2017 Staff (Guide: Ecuador, Spain) |
| Nóra | Szőke | 2022: EGMO 2022 Staff (Coordinator) |
| Timea | Szöllösová | 2019: Slovakia (Contestant 4: Honourable Mention), 2020: Slovakia (Contestant 3: Silver Medal), 2025: Slovakia (Deputy Leader) |
| Gabriella | Sztranyák | 2022: Hungary (Contestant 2: Bronze Medal), 2023: Hungary (Contestant 2: Gold Medal) |
| Aizhan | Taalaibek | 2022: Kyrgyzstan (Contestant 2) |
| Seyedeh Yasamin | Tabatabaee | 2014: Islamic Republic of Iran (Contestant 4: Bronze Medal) |
| Sietske | Tacoma | 2012: Netherlands (Deputy Leader), 2013: Netherlands (Deputy Leader), 2020: EGMO 2020 Staff (Chief Organiser) |
| Azra | Tafro | 2021: Croatia (Deputy Leader) |
| Jona | Tahiri | 2025: EGMO 2025 Staff (Deputy Guide) |
| Meriliis | Täht | 2023: Estonia (Contestant 4: Honourable Mention) |
| Marcella | Takáts | 2022: EGMO 2022 Staff (Organiser) |
| Yuta | Takaya | 2022: Japan (Observer with Leader) |
| Samira | Talipova | 2022: Kyrgyzstan (Contestant 4) |
| Anni | Tallavaara | 2025: Finland (Contestant 2) |
| Anano | Tamarashvili | 2024: EGMO 2024 Staff (Guide: Serbia) |
| Ioana-Maria | Tamaş | 2012: Romania (Contestant 4: Silver Medal) |
| Ella | Tamir | 2013: Finland (Contestant 4), 2014: Finland (Contestant 3), 2015: Finland (Contestant 2) |
| Xintong | Tan | 2024: People's Republic of China (Contestant 2: Gold Medal) |
| Maia | Tanasa | 2023: Luxembourg (Contestant 3) |
| Dagmar | Tanck | 2024: Netherlands (Contestant 4: Bronze Medal) |
| Martina | Taneva | 2017: The former Yugoslav Republic of Macedonia (Contestant 4: Honourable Mention) |
| Jiaqi | Tang | 2022: Canada (Contestant 2: Silver Medal) |
| Yifan (Emma) | Tang | 2021: Canada (Contestant 3), 2022: Canada (Contestant 1: Bronze Medal), 2023: Canada (Contestant 3: Silver Medal), 2024: Canada (Contestant 4: Silver Medal), 2025: Canada (Contestant 4: Silver Medal) |
| Milena | Tansini Pagani | 2018: EGMO 2018 Staff (Staff) |
| Anni | Tapionlinna | 2020: Finland (Contestant 4), 2021: Finland (Contestant 4), 2022: Finland (Contestant 3), 2023: Finland (Contestant 3: Bronze Medal), 2024: Finland (Deputy Leader), 2025: Finland (Leader) |
| Elise | Taragola | 2019: Belgium (Contestant 4) |
| Andrej | Taranenko | 2023: EGMO 2023 Staff (Media) |
| Daniela | Tărîță | 2022: Republic of Moldova (Contestant 3) |
| Keiko | Tasaki | 2014: Japan (Deputy Leader), 2015: Japan (Deputy Leader), 2016: Japan (Deputy Leader), 2017: Japan (Deputy Leader), 2018: Japan (Deputy Leader), 2019: Japan (Deputy Leader), 2023: Japan (Deputy Leader), 2024: Japan (Deputy Leader), 2025: Japan (Deputy Leader) |
| Kristina | Taseva | 2020: North Macedonia (Contestant 4) |
| Zeynep | Taşevli | 2020: Türkiye (Contestant 4: Silver Medal), 2021: Türkiye (Contestant 4: Bronze Medal) |
| Safa | Tasnim | 2021: Bangladesh (Contestant 4) |
| Yuliia | Tatarinova | 2020: Ukraine (Contestant 4: Silver Medal) |
| Tamara | Tataru | 2016: Republic of Moldova (Contestant 4) |
| Nia | Tatrishvili | 2021: Georgia B (Contestant 2) |
| Răzvan | Tatu | 2016: EGMO 2016 Staff (Guide: Ukraine) |
| Aleksandre | Tchagalidze | 2024: EGMO 2024 Staff (Guide: Georgia) |
| Tako | Tchaghalidze | 2024: EGMO 2024 Staff (Guide: Belarus) |
| Dachi | Tchotashvili | 2024: EGMO 2024 Staff (Coordinator) |
| Hannah | Teeuw | 2014: Netherlands (Contestant 4: Bronze Medal) |
| Okan | Tekman | 2012: Türkiye (Leader), 2013: Türkiye (Leader), 2014: EGMO 2014 Staff (Problem Selection Chair, Chief Coordinator) |
| Elina | Telesheva | 2018: Russian Federation (Contestant 3: Gold Medal) |
| Marcel | Teleuca | 2014: Republic of Moldova (Leader), 2015: Republic of Moldova (Leader), 2016: Republic of Moldova (Leader), 2017: Republic of Moldova (Leader), 2018: Republic of Moldova (Deputy Leader), 2019: Republic of Moldova (Leader), 2020: Republic of Moldova (Deputy Leader), 2022: Republic of Moldova (Deputy Leader), 2023: Republic of Moldova (Deputy Leader), 2024: Republic of Moldova (Leader), 2025: Republic of Moldova (Deputy Leader) |
| Aybeniz Yağmur | Temirtaş | 2017: Türkiye (Contestant 1: Bronze Medal), 2018: Türkiye (Contestant 3: Bronze Medal) |
| Merey | Temirzinova | 2021: Kazakhstan (Contestant 2), 2022: Kazakhstan (Contestant 2: Bronze Medal), 2023: Kazakhstan (Contestant 1: Silver Medal), 2024: Kazakhstan (Observer with Deputy) |
| Agnes | Tennisberg | 2023: Estonia (Contestant 3: Honourable Mention) |
| Bogdan | Teodorescu | 2016: EGMO 2016 Staff (Guide: Czechia) |
| Ioana | Teodorescu | 2015: Romania (Contestant 3: Gold Medal), 2016: Romania (Contestant 1: Silver Medal), 2017: Romania (Contestant 1: Silver Medal), 2018: Romania (Deputy Leader) |
| Emre | Tepe | 2023: Türkiye (Observer with Leader) |
| Damaris | ter Haar | 2023: Netherlands (Contestant 2: Bronze Medal) |
| Anja | Tešević | 2024: Serbia (Contestant 2: Bronze Medal) |
| Raouf | Thabet | 2015: Tunisia (Leader), 2017: Tunisia (Leader), 2018: Tunisia (Leader), 2021: Tunisia (Leader), 2022: Tunisia (Leader), 2023: Tunisia (Leader), 2025: Tunisia (Leader) |
| Pratibha | Thakur | 2020: Norway (Contestant 4), 2021: Norway (Contestant 2) |
| Mrudul | Thatte | 2025: India (Leader) |
| Charolin | Thomas | 2023: EGMO 2023 Staff (Sponsor) |
| Penny | Thompson | 2012: EGMO 2012 Staff (Chief Guide) |
| Eloise | Thuey | 2014: United Kingdom (Contestant 3) |
| Maura | Tierney | 2019: EGMO 2019 Staff (Guest) |
| Minea | Tiitinen | 2022: Finland (Contestant 4), 2023: Finland (Contestant 4: Honourable Mention), 2024: Finland (Contestant 4) |
| Irina | Tikhonovskaia | 2024: Switzerland (Contestant 3: Honourable Mention) |
| Hilma | Tillqvist | 2019: Finland (Contestant 4) |
| Juha | Tillqvist | 2019: Finland (Observer with Contestants) |
| Alexandra | Timofte | 2017: Romania (Contestant 4: Silver Medal), 2018: Romania (Contestant 1: Gold Medal), 2019: Romania (Contestant 1: Gold Medal), 2020: Romania (Contestant 1: Gold Medal) |
| Georgia | Timotheou | 2021: Cyprus (Contestant 2), 2022: Cyprus (Contestant 2) |
| Savvas | Timotheou | 2020: Cyprus (Deputy Leader) |
| Magdalena | Tismănaru | 2016: EGMO 2016 Staff (Invigilator) |
| Bára | Tížková | 2017: Czechia (Contestant 4: Honourable Mention) |
| Olha | Tkachenko | 2013: Ukraine (Contestant 3: Bronze Medal), 2019: EGMO 2019 Staff (Coordinator) |
| Josef | Tkadlec | 2016: Czechia (Deputy Leader) |
| Radu-Alexandru | Todor | 2017: EGMO 2017 Staff (Problem Selection, Coordinator) |
| Ioane | Toidze | 2024: EGMO 2024 Staff (Coordinator) |
| Hatice | Toktay | 2014: EGMO 2014 Staff (Guide: Hungary, Luxembourg) |
| Izabella | Tolokno | 2016: Russian Federation (Contestant 4: Gold Medal), 2017: Russian Federation (Contestant 3: Gold Medal), 2018: Russian Federation (Contestant 4: Gold Medal) |
| Diana | Tolu | 2019: Romania (Contestant 4: Silver Medal), 2020: Romania (Contestant 4: Silver Medal), 2021: Romania (Contestant 2: Gold Medal), 2022: Romania (Contestant 1: Gold Medal) |
| Florina | Toma | 2013: Romania (Contestant 4: Bronze Medal) |
| Chuyao | Tong | 2013: Netherlands (Contestant 1) |
| Sabina | Tontici | 2016: Republic of Moldova (Contestant 1), 2017: Republic of Moldova (Contestant 3: Honourable Mention), 2018: Republic of Moldova (Contestant 3: Bronze Medal) |
| Liana | Topan | 2012: Saudi Arabia (Deputy Leader), 2014: Saudi Arabia (Deputy Leader), 2015: Saudi Arabia (Observer with Leader) |
| Arlind | Topanica | 2025: EGMO 2025 Staff (Guide: Kazakhstan) |
| Ágoston | Török | 2022: EGMO 2022 Staff (Guide: Switzerland) |
| Celine | Torres | 2017: EGMO 2017 Staff (Staff) |
| Gaia | Torresani | 2020: Italy (Contestant 4) |
| Anastasija | Tortevska | 2018: The former Yugoslav Republic of Macedonia (Contestant 3: Honourable Mention), 2019: North Macedonia (Contestant 4: Honourable Mention), 2020: North Macedonia (Contestant 1: Bronze Medal) |
| Fahreddin Şükrü | Torun | 2014: EGMO 2014 Staff (Academic assistant) |
| Alice | Tosel | 2022: France (Contestant 3: Honourable Mention) |
| Sara | Toshevska | 2023: North Macedonia (Contestant 4), 2024: North Macedonia (Contestant 3) |
| Galin | Totev | 2025: EGMO 2025 Staff (Coordinator) |
| Balázs | Tóth | 2022: EGMO 2022 Staff (Guide: Azerbaijan) |
| Emese Anna | Tóth | 2012: Hungary (Contestant 2: Bronze Medal), 2013: Hungary (Contestant 4: Gold Medal) |
| Katarina | Tothova | 2017: EGMO 2017 Staff (Staff) |
| Sarah | Tovatt | 2013: Sweden (Contestant 4) |
| Artsiom | Toyestseu | 2015: EGMO 2015 Staff (Coordinator) |
| Anastasija | Trajanova | 2015: The former Yugoslav Republic of Macedonia (Contestant 4) |
| Tara | Trauthwein | 2013: Luxembourg (Contestant 3), 2014: Luxembourg (Contestant 2), 2015: Luxembourg (Contestant 1: Bronze Medal), 2021: Luxembourg (Deputy Leader) |
| Meta | Trdin | 2023: EGMO 2023 Staff (Guide: Hungary) |
| Hugo | Trebše | 2024: EGMO 2024 Staff (Coordinator), 2025: Slovenia (Deputy Leader) |
| Kateryna | Tretiakova | 2023: Canada (Deputy Leader), 2024: Canada (Leader), 2025: Canada (Leader) |
| Enrique | Treviño | 2017: Mexico (Deputy Leader), 2018: Mexico (Leader), 2019: Mexico (Deputy Leader) |
| Giulia | Trevisan | 2013: Italy (Contestant 4: Bronze Medal), 2014: Italy (Contestant 4: Silver Medal), 2018: EGMO 2018 Staff (Coordinator) |
| Marco | Trevisiol | 2018: EGMO 2018 Staff (Coordinator) |
| Arabela | Trică | 2016: EGMO 2016 Staff (Invigilator) |
| Mircea | Trifu | 2016: EGMO 2016 Staff (Staff) |
| Ruth | Trimble | 2025: South Africa (Contestant 3: Honourable Mention) |
| Amélie | Triqueneaux | 2021: France (Contestant 3: Bronze Medal), 2022: France (Contestant 4: Bronze Medal) |
| Jelena | Trisovic | 2012: Serbia (Contestant 3: Bronze Medal), 2013: Serbia (Contestant 3: Bronze Medal), 2014: Serbia (Contestant 2: Bronze Medal) |
| Adrian | Troie | 2016: EGMO 2016 Staff (Coordinator) |
| Diana | Trokowska | 2016: Poland (Contestant 4: Silver Medal) |
| Emanuele | Tron | 2018: EGMO 2018 Staff (Guide: Belgium, Luxembourg) |
| Raquel | Trull Baguena | 2021: Spain (Contestant 4), 2022: Spain (Contestant 1: Honourable Mention) |
| Natia | Tsaava | 2024: EGMO 2024 Staff (Guide: Algeria) |
| Jonathan | Tsang | 2012: EGMO 2012 Staff (Invigilator) |
| Yiying (Sally) | Tsang | 2018: Australia (Observer with Contestants), 2022: Australia (Deputy Leader), 2023: Australia (Leader), 2024: Australia (Leader) |
| Maria Olymbia | Tsianni | 2016: Cyprus (Contestant 3) |
| Myrsini Semeli | Tsiarta | 2019: Cyprus (Contestant 3) |
| Pegky | Tsilimidou | 2025: Cyprus (Contestant 4) |
| Saba | Tsirekidze | 2024: EGMO 2024 Staff (Guide: Israel) |
| Giorgi | Tsitsvidze | 2024: EGMO 2024 Staff (Guide: Latvia) |
| Maria-Elena Aisha | Tskhvediani | 2020: Georgia (Contestant 4: Bronze Medal), 2021: Georgia (Contestant 2) |
| Ksenia | Tsocheva | 2012: Bulgaria (Contestant 2: Honourable Mention) |
| Luka | Tsulaia | 2024: EGMO 2024 Staff (Coordinator) |
| Gvantsa | Tsutskhashvili | 2016: Georgia (Contestant 4) |
| Natalie | Tsygankova | 2019: EGMO 2019 Staff (Guide: France) |
| Allison | Tsypin | 2021: Canada (Contestant 1) |
| Nicoleta | Tudorache | 2016: EGMO 2016 Staff (Staff) |
| Aruzhan | Tuletbekova | 2020: Kazakhstan (Contestant 3: Bronze Medal) |
| Oleksandra | Tumak | 2016: Ukraine (Contestant 3: Silver Medal), 2019: EGMO 2019 Staff (Coordinator) |
| Khulan | Tumenbayar | 2018: Mongolia (Deputy Leader), 2022: Mongolia (Deputy Leader), 2023: Mongolia (Leader), 2024: Mongolia (Leader), 2025: Mongolia (Leader) |
| Sude | Tuncer | 2025: Türkiye (Contestant 4: Honourable Mention) |
| Lucian | Ţurea | 2016: EGMO 2016 Staff (Coordinator) |
| Pia | Turk Žagar | 2023: EGMO 2023 Staff (Staff) |
| Lucija | Turnšek | 2023: EGMO 2023 Staff (Media) |
| Tuva Sofie | Tveiten | 2014: Norway (Contestant 4) |
| Yuliia | Tykhonravova | 2025: Ukraine (Observer with Deputy) |
| Viktoria | Tyryshkina | 2019: EGMO 2019 Staff (Guide: Netherlands) |
| Petroula | Tzartzi | 2022: Greece (Contestant 1) |
| Dilnaz | Ualiyeva | 2019: Kazakhstan (Contestant 3: Bronze Medal), 2020: Kazakhstan (Contestant 2: Gold Medal), 2021: Kazakhstan (Contestant 1: Silver Medal) |
| Beno | Učakar | 2023: EGMO 2023 Staff (Guide: Mongolia) |
| Melih | Üçer | 2015: Türkiye (Deputy Leader) |
| Nanako | Ueda | 2025: United Kingdom (Contestant 3: Gold Medal) |
| Yurika | Ueshiba | 2018: Japan (Contestant 3: Bronze Medal), 2019: Japan (Contestant 3: Silver Medal) |
| Anna | Ugaine | 2023: Latvia (Contestant 4), 2024: Latvia (Contestant 2), 2025: Latvia (Contestant 1: Honourable Mention) |
| Ika | Ugulava | 2024: EGMO 2024 Staff (Coordinator) |
| Muhiddin | Uğuz | 2014: EGMO 2014 Staff (Coordinator) |
| Svetlana | Ukleiko | 2015: EGMO 2015 Staff (Organization Committee) |
| Anna | Ulivi | 2019: Italy (Contestant 4: Bronze Medal) |
| María Valentina | Ulloa Masache | 2023: Ecuador (Contestant 2), 2024: Ecuador (Contestant 2) |
| Hatice Sena | Uluer | 2016: Türkiye (Observer with Deputy), 2017: Türkiye (Observer with Leader) |
| Muhammed İkbal | Ulvi | 2014: Türkiye B (Leader) |
| Zeynep Berra | Uncu | 2023: Türkiye (Contestant 3: Silver Medal) |
| Éva | Ungár | 2022: Hungary B (Contestant 3: Bronze Medal) |
| Agnese | Upīte | 2017: Latvia (Contestant 3: Honourable Mention), 2018: Latvia (Contestant 1: Honourable Mention) |
| Ipshita Bonhi | Upoma | 2021: Bangladesh (Leader), 2022: Bangladesh (Leader), 2024: Bangladesh (Deputy Leader) |
| Zeliha | Ural | 2014: EGMO 2014 Staff (Academic assistant) |
| Matas | Urbonas | 2025: Lithuania (Deputy Leader) |
| Tamanna | Urmi | 2023: Bangladesh (Leader) |
| Ömer | Ursavaş | 2023: Türkiye (Observer with Leader) |
| Patricia | Urtecho | 2020: Peru (Contestant 3: Bronze Medal) |
| Çetin | Ürtiş | 2014: EGMO 2014 Staff (Coordinator) |
| Yuna | Usami | 2017: Japan (Contestant 1: Bronze Medal) |
| Olena | Usoltseva | 2019: EGMO 2019 Staff (Coordinator) |
| Nursel | Üstünsoy | 2014: EGMO 2014 Staff (TÜBİTAK) |
| Nika | Utrobičić | 2020: Croatia (Contestant 4) |
| Otgonbayar | Uuye | 2022: Mongolia (Leader), 2025: Mongolia (Observer with Leader) |
| Tuğba | Uzluer Torun | 2014: Türkiye (Leader) |
| Paul | Vaderlind | 2013: EGMO 2013 Staff (Coordinator), 2023: EGMO 2023 Staff (Coordinator, Problem Selection), 2024: EGMO 2024 Staff (Problem Selection, Coordinator), 2025: EGMO 2025 Staff (Problem Selection, Coordinator) |
| Justina | Vaičaitytė | 2020: Lithuania (Contestant 4) |
| Aliaksei | Vaidzelevich | 2019: EGMO 2019 Staff (Coordinator) |
| Jūlija | Vaikute | 2022: Latvia (Contestant 2: Bronze Medal), 2023: Latvia (Contestant 1: Bronze Medal) |
| Tara | Vaittinen | 2014: Finland (Contestant 4), 2015: Finland (Contestant 3) |
| Adriana | Vajeu | 2016: EGMO 2016 Staff (Staff) |
| Natasha Fernanda | Valarezo Oyola | 2020: Ecuador (Contestant 3), 2021: Ecuador (Contestant 2) |
| Esther | Valbuena | 2017: Spain (Contestant 4) |
| Alexandra | Valdepeñas Ramírez | 2021: Mexico (Contestant 2: Bronze Medal) |
| Triinu | Valdvee | 2025: Estonia (Contestant 3) |
| Benedek | Váli | 2022: EGMO 2022 Staff (Coordinator) |
| Anete | Valnere | 2018: Latvia (Contestant 4: Bronze Medal), 2019: Latvia (Contestant 1: Silver Medal) |
| Viktar | Valodzin | 2015: EGMO 2015 Staff (Guide: Romania) |
| Liesbeth | van Alebeek | 2020: EGMO 2020 Staff (Organiser) |
| Lisa | van Barneveld | 2020: Netherlands B (Contestant 1) |
| Maud | van Bokhoven | 2021: Netherlands (Contestant 1) |
| Raymond | van Bommel | 2020: EGMO 2020 Staff (Organiser) |
| Dirk | van Bree | 2019: Netherlands (Deputy Leader), 2020: Netherlands B (Deputy Leader), 2021: Netherlands (Deputy Leader), 2022: Netherlands (Deputy Leader) |
| Birgit | van Dalen | 2012: Netherlands (Leader, EGMO Board), 2013: Netherlands (Leader, EGMO AB), 2014: Netherlands (Leader, EGMO AB), 2015: Netherlands (Leader, EGMO AB), 2016: Netherlands (Leader, EGMO AB, Problem Selection), 2017: Netherlands (Leader, EGMO AB, Problem Selection), 2018: Netherlands (Leader, EGMO AB), 2019: Netherlands (Leader, EGMO AB, Problem Selection), 2020: EGMO 2020 Staff (Chief Organiser, EGMO AB, Problem Selection), 2024: EGMO 2024 Staff (Problem Selection Chair, Coordinator), 2025: EGMO 2025 Staff (Problem Selection) |
| Lieke | van Dam | 2022: Netherlands (Contestant 1), 2023: Netherlands (Contestant 1: Bronze Medal) |
| Nils | van de Berg | 2020: EGMO 2020 Staff (Crew) |
| Desiree | van den Bogaart | 2020: EGMO 2020 Staff (Organiser) |
| Ellen | van der Meer | 2020: EGMO 2020 Staff (Chief Organiser) |
| Heleen | van der Ree | 2020: EGMO 2020 Staff (Organiser) |
| Ward | van der Schoot | 2020: EGMO 2020 Staff (Crew) |
| Marieke | van der Wegen | 2012: Netherlands (Contestant 4: Honourable Mention), 2020: EGMO 2020 Staff (Organiser) |
| Christel | van Diepen | 2015: Netherlands (Contestant 2), 2016: Netherlands (Contestant 1: Bronze Medal), 2017: Netherlands (Contestant 1: Silver Medal), 2018: Netherlands (Contestant 2: Bronze Medal) |
| Rudi | van Drunen | 2020: EGMO 2020 Staff (Organiser) |
| Jaap | van Ginkel | 2020: EGMO 2020 Staff (Organiser) |
| Karen | Van Opdenbosch | 2019: Belgium (Deputy Leader) |
| Sièna | van Schaick | 2019: Netherlands (Contestant 3: Bronze Medal) |
| Kees | van Schenk Brill | 2020: EGMO 2020 Staff (Organiser) |
| Lianne | van Timmeren | 2020: EGMO 2020 Staff (Organiser) |
| Miléna | Vankó | 2016: Hungary (Contestant 2: Bronze Medal), 2018: Hungary (Contestant 3: Bronze Medal) |
| Péter | Varga | 2022: EGMO 2022 Staff (Entertainment) |
| Danna | Vargas | 2019: Peru (Contestant 4: Honourable Mention) |
| Burak | Varıcı | 2014: EGMO 2014 Staff (Academic assistant) |
| Katja | Varjačić | 2022: Croatia (Deputy Leader) |
| Annija | Varkale | 2015: Latvia (Contestant 1) |
| Zsombor | Várkonyi | 2022: EGMO 2022 Staff (Coordinator) |
| Glinova | Varvara | 2022: Kyrgyzstan (Contestant 3) |
| Nadezhda | Vasilchenko | 2015: EGMO 2015 Staff (Organization Committee) |
| Silviu | Vasile | 2016: EGMO 2016 Staff (IT) |
| Aija | Vasilevska | 2014: Latvia (Deputy Leader) |
| Maira | Vasilevska | 2012: Latvia (Contestant 3) |
| Veronika | Vasilevska | 2014: Latvia (Contestant 3) |
| Alexandra | Vasilopoulou | 2022: Greece (Contestant 2: Honourable Mention) |
| Denis | Vasilyev | 2015: EGMO 2015 Staff (Coordinator) |
| Irina | Vasilyeva | 2016: Russian Federation (Deputy Leader), 2017: Russian Federation (Deputy Leader) |
| Maricruz | Vásquez Sandí | 2018: Costa Rica (Contestant 3), 2019: Costa Rica (Contestant 3), 2020: Costa Rica (Contestant 4), 2021: Costa Rica (Deputy Leader) |
| Bodil Kondrup | Vedel | 2020: Denmark (Contestant 3: Bronze Medal), 2021: Denmark (Contestant 1), 2022: Denmark (Contestant 1: Honourable Mention), 2024: Denmark (Deputy Leader), 2025: Denmark (Deputy Leader) |
| Luana | Vega | 2025: Peru (Contestant 4: Honourable Mention) |
| Elisabetta | Velabri | 2018: EGMO 2018 Staff (Staff) |
| Birgit | Veldi | 2023: Estonia (Deputy Leader), 2024: Estonia (Leader), 2025: Estonia (Leader) |
| Nóra | Velich | 2020: Hungary (Contestant 4: Silver Medal), 2021: Hungary (Contestant 1: Gold Medal), 2022: EGMO 2022 Staff (Guide: Kazakhstan) |
| Milena | Velikova | 2013: Bulgaria (Contestant 2: Bronze Medal) |
| Hedvig Margrete | Venbakken | 2017: Norway (Contestant 3), 2018: Norway (Contestant 3: Honourable Mention), 2019: Norway (Contestant 4) |
| Francesco | Veneziano | 2018: EGMO 2018 Staff (Coordinator) |
| Hyandira Helen | Ventura Cruz | 2018: Bolivia (Contestant 1) |
| Fernado | Vera Hurtado | 2018: Bolivia (Leader), 2021: Bolivia (Leader) |
| Angela | Veronese | 2012: Italy (Contestant 4: Bronze Medal), 2018: EGMO 2018 Staff (Staff) |
| Esa | Vesalainen | 2012: Finland (Deputy Leader), 2013: Finland (Leader), 2014: Finland (Deputy Leader), 2015: Finland (Leader), 2016: Finland (Leader) |
| Misha | Veselinski | 2023: North Macedonia (Contestant 3: Honourable Mention), 2024: North Macedonia (Contestant 2: Bronze Medal), 2025: North Macedonia (Contestant 4: Honourable Mention) |
| Anastasiia | Vestel | 2019: EGMO 2019 Staff (Guide: Italy) |
| Alena | Viartsinskaya | 2023: Belarus (Contestant 1: Bronze Medal) |
| Alina | Viarutsina | 2022: Belarus (Contestant 2: Bronze Medal), 2023: Belarus (Contestant 2: Bronze Medal) |
| Maryna | Viazovska | 2023: Ukraine (Observer with Leader) |
| Essi | Vilhonen | 2017: Finland (Contestant 2), 2018: Finland (Contestant 4: Honourable Mention) |
| Adriana Otilija | Vilkaitė | 2016: Lithuania (Contestant 4) |
| Juelana | Villegas Segura | 2018: Costa Rica (Deputy Leader) |
| Neža | Vipavc | 2020: Slovenia (Contestant 4) |
| Andreja | Vipotnik Ravnak | 2023: EGMO 2023 Staff (Staff) |
| Adelina | Vişan | 2016: EGMO 2016 Staff (Guide: Türkiye) |
| Gabriel | Vişan | 2016: EGMO 2016 Staff (Guide: Spain) |
| Giulia | Vişan | 2016: EGMO 2016 Staff (Guide: Mexico) |
| Vesa | Vishaj | 2021: Kosovo (Contestant 4) |
| Esther | Visser | 2013: Netherlands (Contestant 2), 2020: EGMO 2020 Staff (Organiser) |
| Laura | Vištanová | 2020: Slovakia (Deputy Leader), 2021: Slovakia (Deputy Leader), 2022: Slovakia (Deputy Leader), 2023: Slovakia (Deputy Leader) |
| Maia Reffs | Vistisen | 2023: Denmark (Contestant 4: Bronze Medal), 2024: Denmark (Contestant 4: Bronze Medal) |
| Antonela | Vladeva | 2025: North Macedonia (Contestant 1) |
| Loura | Vlam | 2020: EGMO 2020 Staff (Organiser) |
| Nadezhda | Vlasova | 2021: Russian Federation (Deputy Leader) |
| Dinh Thanh Phong | Vo | 2019: EGMO 2019 Staff (Coordinator) |
| Nadja | Vohradsky | 2018: Austria (Contestant 3) |
| Mădălin | Voica | 2016: EGMO 2016 Staff (Guide: Norway) |
| Jana | Voiciša | 2021: Latvia (Contestant 4) |
| Mirela | Voiculeţ | 2016: EGMO 2016 Staff (Invigilator) |
| Alexei | Voidelevich | 2015: EGMO 2015 Staff (Problem Selection, Coordinator) |
| Plarent | Vokopola | 2014: EGMO 2014 Staff (Guide: Italy) |
| Emilija | Volarev | 2023: EGMO 2023 Staff (Guide: Kosovo) |
| Maileen | Volberg | 2025: Estonia (Contestant 4) |
| Viyaleta | Volkava | 2015: EGMO 2015 Staff (Guide: Türkiye) |
| Ivan | Voloshyn | 2019: EGMO 2019 Staff (Guide Team Lead) |
| Julia | Volovich | 2024: United Kingdom (Contestant 4: Bronze Medal) |
| Rahel | von Arx | 2017: EGMO 2017 Staff (Invigilator, Staff) |
| Virginia | von Streng | 2017: EGMO 2017 Staff (Guide: Saudi Arabia) |
| Michèle | Voncken | 2023: Luxembourg (Contestant 4: Honourable Mention) |
| Miriam | Vonesch | 2017: EGMO 2017 Staff (Guide: Lithuania, Luxembourg) |
| Femke | Voogt | 2020: Netherlands B (Contestant 2) |
| Jenni | Voon | 2021: United Kingdom (Contestant 4: Gold Medal), 2023: United Kingdom (Observer with Contestants) |
| Igor | Voronovich | 2014: Belarus (Observer with Leader), 2015: EGMO 2015 Staff (Problem Selection Chair, Coordinator) |
| Marios | Voskou | 2024: Cyprus (Deputy Leader), 2025: Cyprus (Leader) |
| Domen | Vreš | 2019: Slovenia (Leader) |
| Jaka | Vrhovnik | 2023: Slovenia (Leader) |
| Jana | Vučković | 2016: Serbia (Contestant 3: Bronze Medal), 2017: Serbia (Contestant 3: Silver Medal) |
| Milica | Vugdelić | 2019: Serbia (Contestant 3: Bronze Medal), 2020: Serbia (Contestant 3: Gold Medal), 2021: Serbia (Contestant 1: Gold Medal), 2023: EGMO 2023 Staff (Coordinator) |
| Marijana | Vujadinović | 2012: Serbia (Contestant 4: Bronze Medal), 2013: Serbia (Contestant 4: Silver Medal), 2014: Serbia (Contestant 3: Bronze Medal), 2015: Serbia (Contestant 3: Silver Medal) |
| Borna | Vukorepa | 2020: Croatia (Leader), 2024: Croatia (Leader), 2025: Croatia (Leader) |
| Kamala | Waber | 2017: EGMO 2017 Staff (Guide: Liechtenstein, Latvia) |
| Rama | Waber | 2017: EGMO 2017 Staff (Deputy Chief Guide) |
| Akari | Wada | 2023: Japan (Contestant 3: Bronze Medal) |
| Minori | Wada | 2016: Japan (Contestant 4: Bronze Medal), 2017: Japan (Contestant 2: Bronze Medal) |
| Réka Amélie | Wagener | 2021: Germany (Contestant 4: Silver Medal), 2022: Germany (Contestant 4: Gold Medal), 2023: Germany (Contestant 4: Gold Medal) |
| Xenia Nikola | Wagner | 2020: Germany (Contestant 3: Bronze Medal) |
| Aled | Walker | 2012: EGMO 2012 Staff (Coordinator) |
| Aurelia | Walker | 2025: United Kingdom (Contestant 4: Silver Medal) |
| Charlotte | Walmsley | 2024: Ireland (Contestant 2), 2025: Ireland (Contestant 3: Honourable Mention) |
| Jessica | Wan | 2021: United States of America (Contestant 4: Gold Medal), 2022: United States of America (Contestant 1: Gold Medal), 2023: United States of America (Contestant 3: Gold Medal), 2024: United States of America (Contestant 1: Gold Medal) |
| Danielle | Wang | 2012: United States of America (Contestant 3: Gold Medal), 2013: United States of America (Contestant 2: Gold Medal), 2014: United States of America (Contestant 1: Gold Medal), 2015: United States of America (Contestant 3: Gold Medal), 2020: EGMO 2020 Staff (Problem Selection) |
| Jennifer | Wang | 2020: Canada (Contestant 3: Silver Medal), 2021: Canada (Contestant 2: Silver Medal) |
| Lucie | Wang | 2014: France (Contestant 4: Bronze Medal), 2015: France (Contestant 4: Silver Medal), 2016: France (Contestant 4: Gold Medal) |
| Qiyue | Wang | 2023: Cyprus (Contestant 3), 2024: Cyprus (Contestant 2) |
| Yanta | Wang | 2018: Switzerland (Contestant 4: Bronze Medal), 2019: Switzerland (Contestant 4: Bronze Medal), 2020: Switzerland (Contestant 3: Silver Medal), 2021: Switzerland (Contestant 4: Silver Medal), 2022: Switzerland (Contestant 1: Silver Medal), 2023: Switzerland (Deputy Leader) |
| Yohan | Wang | 2024: Taiwan (Contestant 4), 2025: Taiwan (Contestant 3: Silver Medal) |
| Chuang Lin | Wang Kong | 2017: Costa Rica (Contestant 2) |
| Pranjal | Warade | 2015: India (Contestant 1: Bronze Medal), 2017: India (Observer with Contestants), 2018: India (Observer with Contestants) |
| Kasia | Warburton | 2013: United Kingdom (Contestant 4: Honourable Mention), 2014: United Kingdom (Contestant 4: Silver Medal), 2017: United Kingdom (Observer with Contestants), 2019: United Kingdom (Deputy Leader), 2020: United Kingdom (Deputy Leader), 2021: United Kingdom (Deputy Leader), 2022: United Kingdom (Deputy Leader), 2023: United Kingdom (Leader), 2024: United Kingdom (Leader), 2025: United Kingdom (Leader) |
| Anton | Wardaja | 2012: Indonesia (Leader) |
| Katja | Warth | 2017: EGMO 2017 Staff (Invigilator, Staff) |
| Yuka | Watabe | 2017: Japan (Contestant 3: Bronze Medal), 2018: Japan (Contestant 4: Gold Medal) |
| Haruka | Watanabe | 2019: Japan (Contestant 4: Bronze Medal) |
| Naomi | Wei | 2016: United Kingdom (Contestant 4: Silver Medal), 2017: United Kingdom (Contestant 3: Bronze Medal), 2018: United Kingdom (Contestant 4: Silver Medal) |
| Tzer-jen | Wei | 2025: Taiwan (Leader) |
| Zixian | Wei | 2019: Canada (Contestant 4: Honourable Mention) |
| Jessica | Weitbrecht | 2012: Ireland (Contestant 4), 2013: Ireland (Contestant 3), 2014: Ireland (Deputy Leader) |
| Emily | Wen | 2018: United States of America (Contestant 3: Bronze Medal) |
| Alicia | Weng | 2013: United States of America (Contestant 3: Silver Medal), 2014: United States of America (Contestant 2: Silver Medal) |
| Mieke | Wessel | 2016: Netherlands (Contestant 4: Silver Medal) |
| Panka | Wiener | 2023: Hungary (Contestant 3: Silver Medal), 2024: Hungary (Contestant 1: Silver Medal) |
| Surya | Wijaya | 2014: Indonesia (Leader) |
| Dr. Chanakya Janak | Wijeratne | 2025: Sri Lanka (Leader) |
| Kada | Williams | 2022: EGMO 2022 Staff (Coordinator) |
| Jeroen | Winkel | 2020: EGMO 2020 Staff (Coordinator, Problem Selection) |
| Rafael | Winkler | 2017: EGMO 2017 Staff (Staff) |
| Philipp | Wirth | 2017: EGMO 2017 Staff (Coordinator) |
| Gerhard | Woeginger | 2013: EGMO 2013 Staff (Problem Selection, Coordinator) |
| Ladina | Wohlwend | 2017: Liechtenstein (Contestant 3) |
| Emily | Wolfe | 2022: Ireland (Contestant 3), 2023: Ireland (Contestant 4) |
| Rachel | Wong | 2020: Australia (Observer with Deputy), 2021: Australia (Observer with Deputy) |
| Weronika | Wrzos-Kaminska | 2015: Norway (Contestant 3), 2016: Norway (Contestant 3: Bronze Medal), 2018: Norway (Deputy Leader), 2019: Norway (Deputy Leader), 2020: Norway (Deputy Leader), 2021: Norway (Deputy Leader), 2022: Norway (Deputy Leader), 2023: Norway (Deputy Leader), 2024: Norway (Deputy Leader), 2025: Norway (Leader) |
| Catherine | Wu | 2018: United States of America (Contestant 1: Gold Medal), 2019: United States of America (Contestant 3: Gold Medal) |
| Ruiying | Wu | 2020: Australia (Contestant 3), 2021: Australia (Contestant 1: Gold Medal) |
| Zhiron Cristina | Wu Yuan | 2019: Ecuador (Contestant 4), 2020: Ecuador (Contestant 2), 2021: Ecuador (Contestant 1), 2023: Ecuador (Leader) |
| Maria | Wysogląd | 2019: Poland (Contestant 4) |
| Dimitri | Wyss | 2017: EGMO 2017 Staff (Problem Selection Chair, Coordinator) |
| Vesa | Xhymshiti | 2025: Kosovo (Contestant 2: Honourable Mention) |
| Janabel | Xia | 2019: United States of America (Contestant 4: Silver Medal) |
| Victoria | Xia | 2012: United States of America (Contestant 4: Gold Medal), 2014: United States of America (Contestant 3: Gold Medal) |
| Liang | Xiao | 2023: People's Republic of China (Leader), 2024: People's Republic of China (Leader), 2025: People's Republic of China (Leader) |
| Yingshan (Shanna) | Xiao | 2023: Canada (Contestant 2: Bronze Medal), 2025: Canada (Contestant 3: Bronze Medal) |
| Ruojin (Joanna) | Xie | 2024: Canada (Contestant 3: Bronze Medal) |
| Tianyiwa | Xie | 2018: Ireland (Contestant 2: Honourable Mention), 2019: Ireland (Contestant 1: Bronze Medal), 2020: Ireland (Contestant 2: Bronze Medal) |
| Honjar | Xing | 2025: Canada (Contestant 2: Bronze Medal) |
| Yuelin | Xiong | 2017: Ireland (Contestant 4) |
| Cloris | Xu | 2022: Australia (Contestant 2: Gold Medal), 2023: Australia (Contestant 3: Gold Medal), 2024: Australia (Contestant 3: Gold Medal) |
| Iris | Xu | 2022: Australia (Contestant 3: Gold Medal), 2023: Australia (Contestant 4: Gold Medal), 2024: Australia (Contestant 4: Gold Medal) |
| Meilun | Xu | 2019: Ireland (Contestant 3), 2020: Ireland (Contestant 4) |
| Sophie | Xu | 2025: New Zealand (Contestant 4: Honourable Mention) |
| Yian | Xu | 2025: South Africa (Contestant 1: Bronze Medal) |
| Fangyu | Xue | 2021: France (Contestant 4) |
| Safura | XXX | 2022: Azerbaijan (Contestant 3: Bronze Medal), 2023: Azerbaijan (Contestant 3: Honourable Mention) |
| Ivan | Yakovlev | 2019: EGMO 2019 Staff (Coordinator) |
| Viktoryia | Yakutsenak | 2015: EGMO 2015 Staff (Guide: Mexico) |
| Viktor | Yakzhik | 2015: EGMO 2015 Staff (Organization Committee) |
| Mika | Yamanouchi | 2021: Japan (Contestant 3: Bronze Medal), 2023: Japan (Contestant 4: Bronze Medal) |
| Mayuko | Yamashita | 2017: Japan (Observer with Leader) |
| Shiori | Yamashita | 2017: Japan (Contestant 4: Bronze Medal) |
| Débora | Yamato | 2018: Brazil (Contestant 4: Bronze Medal) |
| Alina | Yan | 2017: Ukraine (Contestant 3: Silver Medal), 2019: EGMO 2019 Staff (Coordinator), 2024: EGMO 2024 Staff (Coordinator) |
| Jiali | Yan | 2012: Finland (Contestant 4: Bronze Medal) |
| Christine | Yang | 2020: United States of America (Contestant 4: Silver Medal) |
| Anhelina | Yarashenka | 2015: Belarus B (Contestant 3) |
| Anastasiia | Yaroshovets | 2019: EGMO 2019 Staff (Guide: Slovenia) |
| İrem | Yaşar | 2017: Türkiye (Contestant 2: Honourable Mention), 2018: Türkiye (Contestant 4: Honourable Mention) |
| Joanna | Yass | 2015: United Kingdom (Contestant 4: Bronze Medal) |
| Mayumi | Yasuda | 2015: Japan (Observer with Leader) |
| Yurika | Yasuda | 2021: Japan (Contestant 4: Bronze Medal), 2022: Japan (Contestant 4: Bronze Medal) |
| Lesia | Yavorska | 2019: EGMO 2019 Staff (Guide: Bulgaria) |
| Feyza | Yavuz | 2014: Türkiye B (Contestant 4) |
| Nagihan Demet | Yavuz | 2014: EGMO 2014 Staff (TÜBİTAK) |
| İrem Gülce | Yazgan | 2022: Türkiye (Contestant 4: Gold Medal), 2023: Türkiye (Contestant 4: Gold Medal), 2024: Türkiye (Contestant 4: Gold Medal) |
| Chun-chen | Yeh | 2023: Taiwan (Observer with Leader), 2024: Taiwan (Deputy Leader) |
| Feray Lina | Yence | 2019: Türkiye (Contestant 4: Honourable Mention) |
| Ava | Yeo | 2024: United Kingdom (Observer with Contestants), 2025: United Kingdom (Observer with Contestants) |
| Mane | Yeritsyan | 2025: Armenia (Contestant 4: Bronze Medal) |
| Olga | Yermalkevich | 2015: EGMO 2015 Staff (Guide: Italy) |
| Elizabeth | Yevdokimov | 2021: Australia (Contestant 2: Bronze Medal), 2025: Australia (Deputy Leader) |
| Bahattin | Yıldız | 2014: EGMO 2014 Staff (Coordinator) |
| Burcu | Yıldız | 2017: Türkiye (Contestant 3: Silver Medal) |
| Mehmet Akif | Yıldız | 2014: EGMO 2014 Staff (Coordinator) |
| Ozan | Yıldız | 2014: EGMO 2014 Staff (Coordinator) |
| Harun | Yılmaz | 2014: EGMO 2014 Staff (TÜBİTAK) |
| Ülkü Nurdan | Yılmaz | 2017: Türkiye (Contestant 4: Honourable Mention) |
| Khrystyna | Yordan | 2019: EGMO 2019 Staff (Guide Team Lead) |
| Heather | Yorston | 2012: EGMO 2012 Staff (Invigilator) |
| Tomoki | Yoshida | 2025: Japan (Observer with Leader) |
| Siqin | You | 2025: Ireland (Contestant 4: Honourable Mention) |
| Dandan | Yu | 2023: People's Republic of China (Deputy Leader), 2025: People's Republic of China (Deputy Leader) |
| Wei-hsuan | Yu | 2024: Taiwan (Observer with Leader) |
| Grace Chang | Yuan | 2022: Australia (Contestant 4: Gold Medal) |
| Lai | Yuan | 2023: People's Republic of China (Contestant 2: Gold Medal) |
| Kanaya Padma | Yudewo | 2020: Indonesia (Contestant 2: Bronze Medal) |
| Yuliya | Zabelina | 2023: Norway (Contestant 2), 2024: Norway (Contestant 1) |
| Gaja | Zabukovšek Lipovšek | 2023: EGMO 2023 Staff (Guide: People's Republic of China) |
| Mariya | Zacharneva | 2019: Belarus (Contestant 3: Bronze Medal) |
| Ioanna | Zachou | 2024: Greece (Contestant 4: Honourable Mention), 2025: Greece (Contestant 4: Honourable Mention) |
| Adéla Karolína | Žáčková | 2019: Czechia (Contestant 4: Honourable Mention), 2020: Czechia (Contestant 4), 2021: Czechia (Contestant 4: Bronze Medal) |
| Hanna | Zadarazhniuk | 2015: Belarus B (Contestant 4: Honourable Mention) |
| Olita Anastasija | Zadarožnaja | 2022: Latvia (Contestant 4: Honourable Mention) |
| Mara-Ioana | Zaharia | 2023: Romania (Contestant 1: Silver Medal), 2024: Romania (Contestant 1: Silver Medal) |
| Ákos | Záhorský | 2022: EGMO 2022 Staff (Coordinator), 2024: EGMO 2024 Staff (Coordinator) |
| Nejc | Zajc | 2023: EGMO 2023 Staff (Guide: Romania) |
| Gašper | Žajdela | 2023: EGMO 2023 Staff (Guide: Belarus) |
| Yana | Zakharchenko | 2019: EGMO 2019 Staff (Guide: Chile) |
| Inna | Zakharevich | 2012: United States of America (Leader) |
| Monamy | Zaman | 2024: Bangladesh (Contestant 2: Honourable Mention) |
| Carolina | Zamora Nasralah | 2019: Costa Rica (Contestant 2) |
| Federica | Zanni | 2016: Italy (Contestant 4: Bronze Medal) |
| Riccardo | Zanotto | 2018: EGMO 2018 Staff (Staff) |
| Estrella | Zapata | 2025: Peru (Contestant 2: Silver Medal) |
| Jesus | Zapata | 2018: Peru (Leader), 2019: Peru (Leader), 2020: Peru (Leader), 2021: Peru (Leader), 2022: Peru (Observer with Leader), 2025: Peru (Leader) |
| Maša | Žaucer | 2023: EGMO 2023 Staff (Guide: Lithuania) |
| Stefanie | Zbinden | 2013: Switzerland (Contestant 4: Honourable Mention), 2014: Switzerland (Contestant 4: Silver Medal), 2015: Switzerland (Contestant 4: Bronze Medal), 2016: Switzerland (Contestant 4: Silver Medal), 2017: Switzerland (Deputy Leader), 2017: Switzerland B (Deputy Leader), 2023: EGMO 2023 Staff (Coordinator) |
| Yuliia | Zdanovska | 2016: Ukraine (Contestant 4), 2017: Ukraine (Contestant 4: Silver Medal) |
| Danica | Zečević | 2016: Serbia (Contestant 1: Gold Medal), 2017: Serbia (Contestant 1: Bronze Medal), 2023: Serbia (Deputy Leader), 2024: Serbia (Deputy Leader) |
| Dana | Zeidman | 2017: Israel (Contestant 2) |
| Pascal | Zeihen | 2013: EGMO 2013 Staff (Local Organization Committee, Invigilator), 2017: Luxembourg (Deputy Leader), 2018: Luxembourg (Deputy Leader), 2023: Luxembourg (Leader) |
| Drin | Zeka | 2025: EGMO 2025 Staff (Guide: People's Republic of China) |
| Jure | Željko | 2023: EGMO 2023 Staff (Guide: Japan) |
| Rubina | Zeqiri | 2025: EGMO 2025 Staff (Guide: Belgium) |
| Erblina | Zeqiri Sinani | 2020: North Macedonia (Deputy Leader), 2021: North Macedonia (Deputy Leader), 2022: North Macedonia (Deputy Leader), 2023: North Macedonia (Deputy Leader), 2024: North Macedonia (Deputy Leader), 2025: EGMO 2025 Staff (Coordinator) |
| Klevisa | Zeqja | 2025: Albania (Contestant 1: Honourable Mention) |
| Yufan | Zhai | 2025: Hungary (Contestant 4: Silver Medal) |
| Moyang | Zhang | 2022: Switzerland (Contestant 4) |
| Rachel | Zhang | 2014: United States of America (Contestant 4: Silver Medal), 2015: United States of America (Contestant 4: Gold Medal), 2016: United States of America (Contestant 4: Gold Medal), 2018: United States of America (Deputy Leader), 2019: United States of America (Deputy Leader), 2020: United States of America (Deputy Leader), 2021: United States of America (Leader), 2022: United States of America (Leader), 2023: United States of America (Leader), 2024: United States of America (Leader), 2025: United States of America (Leader) |
| Sophie | Zhang | 2025: Canada (Contestant 1: Silver Medal) |
| Xinyue Alice | Zhang | 2018: Australia (Contestant 2: Bronze Medal) |
| Zihui | Zhang | 2025: Australia (Contestant 2: Silver Medal) |
| Jingyi | Zhao | 2013: United States of America (Contestant 1: Bronze Medal), 2017: EGMO 2017 Staff (Guide: United States of America) |
| Miranda | Zhao | 2022: Canada (Contestant 4: Silver Medal) |
| Yuliya | Zhautouskaya | 2020: Belarus (Contestant 3: Silver Medal) |
| Elisa | Zheng | 2023: France (Contestant 4: Honourable Mention) |
| Émilie | Zheng | 2020: France (Contestant 4: Honourable Mention) |
| Tianyue | Zheng | 2018: Australia (Contestant 3: Bronze Medal) |
| Yuanyuan | Zheng | 2012: EGMO 2012 Staff (Invigilator) |
| Yuxi | Zheng | 2017: Switzerland B (Contestant 2: Bronze Medal) |
| Andrii | Zhenzherukha | 2019: EGMO 2019 Staff (Guide: Denmark) |
| Shend | Zhjeqi | 2025: EGMO 2025 Staff (Chief Coordinator) |
| Mate | Zhorzholiani | 2024: EGMO 2024 Staff (Guide: Slovakia) |
| Amelie | Zhou | 2020: Canada (Contestant 4) |
| Jaroslav | Zhouf | 2016: Czechia (Leader), 2017: Czechia (Leader), 2018: Czechia (Leader) |
| Maryna | Zhovtetska | 2019: EGMO 2019 Staff (Guide: Slovakia) |
| Alison | Zhu | 2012: United Kingdom (Leader, EGMO Committee) |
| Isabella | Zhu | 2022: United States of America (Contestant 3: Gold Medal), 2023: United States of America (Contestant 1: Gold Medal) |
| Siye | Zhu | 2017: United States of America (Contestant 2: Gold Medal) |
| Olha | Zhur | 2019: Ukraine B (Contestant 4: Bronze Medal) |
| Mikhail | Zhuravkov | 2015: EGMO 2015 Staff (Chairman OC) |
| Yauheni | Zhybryk | 2015: EGMO 2015 Staff (Coordinator) |
| Taras | Zhylenko | 2019: EGMO 2019 Staff (Coordinator) |
| Anastasiya | Zhyrkevich | 2013: Belarus (Contestant 4: Gold Medal), 2015: EGMO 2015 Staff (Coordinator), 2017: EGMO 2017 Staff (Coordinator), 2019: EGMO 2019 Staff (Coordinator), 2020: EGMO 2020 Staff (Coordinator), 2024: EGMO 2024 Staff (Coordinator) |
| Barbara | Zięba | 2017: Poland (Contestant 4: Silver Medal) |
| Ivona | Zikova | 2021: North Macedonia (Contestant 2), 2022: North Macedonia (Contestant 4: Honourable Mention), 2023: North Macedonia (Contestant 2: Honourable Mention) |
| Kyriaki | Zioga | 2020: Cyprus (Contestant 3) |
| Neda | Živanović | 2024: Serbia (Contestant 3: Bronze Medal) |
| Gal | Zmazek | 2023: EGMO 2023 Staff (Coordinator) |
| David | Zmiaikou | 2024: Belarus (Deputy Leader) |
| Jetze | Zoethout | 2018: Netherlands (Observer with Deputy), 2020: EGMO 2020 Staff (Chief Organiser) |
| Allie | Zong | 2020: Netherlands B (Contestant 3), 2021: Netherlands (Contestant 3: Bronze Medal), 2022: Netherlands (Contestant 4: Silver Medal), 2023: Netherlands (Contestant 4: Bronze Medal) |
| Evangelos | Zotos | 2022: Greece (Deputy Leader), 2023: Greece (Deputy Leader), 2024: Greece (Deputy Leader), 2025: Greece (Deputy Leader) |
| Afroditi - Iliana | Zotou | 2018: Greece (Contestant 4) |
| Sofia | Zotova | 2019: Germany (Contestant 4: Honourable Mention), 2020: Germany (Contestant 4: Bronze Medal) |
| Bálint | Zsigri | 2022: EGMO 2022 Staff (Guide: Slovakia) |
| Szandi | Zsupanek | 2022: EGMO 2022 Staff (Guide: Georgia) |
| Stephanie | Zube | 2017: EGMO 2017 Staff (Invigilator) |
| Florence | Zuffrey | 2017: EGMO 2017 Staff (Deputy Chief Guide) |
| Gabriëlle | Zwaneveld | 2018: Netherlands (Contestant 4: Silver Medal), 2020: Netherlands (Leader), 2021: Netherlands (Leader), 2022: Netherlands (Leader), 2023: Netherlands (Leader), 2024: Netherlands (Deputy Leader), 2025: Netherlands (Leader) |
| Naomi | Zwaneveld | 2020: Netherlands B (Contestant 4), 2021: Netherlands (Contestant 4) |
| Aleksandra | Żyniewicz | 2025: Poland (Contestant 2: Bronze Medal) |
