All medalists.
IMO & IOI, including honourable mentions.
OKOhad KleinIsraelIOI2013 · 2014BigArchAlgorithmsIndexed profileONOhad NirIsraelIMO2008 · 2009 · 2010Competition recordHonourable mention · Bronze medal · Silver medalOKOhto KatilaFinlandIMO2025 · 2026Competition recordBronze medal · Honourable mentionODOisin DaveyIrelandIOI2021Maynooth UniversityIndexed profileOFOisín FaustIrelandIMO2013 · 2014Tower Research CapitalQuantitative ResearcherAutumn profile
Oisín Flynn-ConnollyIrelandIMO2014 · 2015Leiden UniversityPostdocAutumn profileOVOjārs Vilmārs RatnieksLatviaIOI2012 · 2013GoogleSoftware EngineerIndexed profileOGOjas GulatiUnited KingdomIOI2022Competition recordHonourable mentionOMOjas MittalIndiaIMO2019University of OxfordIndexed profileOWOkechukwu Williams OkekeNigeriaIMO2017 · 2018Special Maths AcademySenior Maths InstructorIndexed profileOUOkezie Uzochukwu ChiedozieNigeriaIMO2020BloombergSoftware Engineering InternIndexed profileOBOlaf BöhmeGerman Democratic RepublicIMO1970 · 1972Competition recordBronze medal · Silver medalOKOlaf KlugeGermanyIOI1991Competition recordSilver medal
Olaf TargowskiPolandIOI2023Competition recordBronze medalAutumn profileOHOlav Hellebust HaalandNorwayIMO2019Competition recordHonourable mentionOPOlavo Paschoal LongoBrazilIMO2021 · 2022Competition recordSilver medal · Gold medalIndexed profile
Olcay OransoyTürkiyeIOI2021Competition recordBronze medalAutumn profileOAOleg AlexandrovRepublic of MoldovaIMO1994NASA Ames Research CenterComputer vision engineerIndexed profileOBOleg BondarenkoUnion of Soviet Socialist RepublicsIMO1985Competition recordSilver medalOGOleg Gol'bergRussian Federation, United States of AmericaIMO2002 · 2003 · 2004ToastLead Principal Engineer / Architect, CommerceIndexed profileOIOleg IvanovRussiaIOI2012Samsung R&D Institute & AI Center RussiaIndexed profileOIOleg IvriiCanadaIMO2003 · 2004Competition recordBronze medal · Honourable mentionOKOleg KošikEstoniaIMO2003University of TartuResearch ScientistIndexed profileOKOleg Krestev MushkarovBulgariaIMO1969Competition recordBronze medalOLOleg LyashkoUnion of Soviet Socialist RepublicsIMO1971Competition recordSilver medalOMOleg MürkEstoniaIOI1996 · 1997Competition recordSilver medal · Gold medalIndexed profileOPOleg PetšonkinEstoniaIMO2001Competition recordBronze medalOMOļegs MatvejevsLatviaIMO2014Competition recordHonourable mentionOSOleg SmirnovRussian FederationIMO2019Competition recordGold medalOOOļegs OšmjansLatviaIMO2010Competition recordHonourable mentionOOOļegs OšmjansLatviaIOI2008 · 2009 · 2010Competition recordBronze medalOSOleg StyrtRussian FederationIMO2002Competition recordGold medalOUOļegs UrziksLatviaIOI2003 · 2004 · 2005MetaAndroid Software EngineerIndexed profileOTOleg TaborovetsBelarusIOI1990TollNetSoftware EngineerIndexed profileOZOleg ZlydenkoIsraelIMO2006 · 2007 · 2008GoogleSenior Software EngineerIndexed profile
Oleh NaverUkraineIOI2020 · 2021 · 2022Competition recordSilver medal · Gold medalAutumn profileOROleh RudenkoUkraineIMO2017Competition recordSilver medal
Oleksandr BaganUkraineIMO2011Neo CyberneticaSenior Machine Learning EngineerAutumn profileOCOleksandr ChuklinUkraineIMO2005 · 2006Google DeepMindResearch EngineerIndexed profileOGOleksandr GalkinUkraineIOI2003Competition recordBronze medalOGOleksandr GrushetskyyUkraineIOI1998Competition recordSilver medalOHOleksandr HorbunovUkraineIMO2025 · 2026Competition recordSilver medal · Gold medalOIOleksandr IotkoUkraineIOI1999UBISIndexed profileOKOleksandr KorniienkoUkraineIMO1992CelayixDirector of Engineering & TechnologyIndexed profileOKOleksandr KravetsUkraineIMO2005Columbia UniversityPostdoctoral Research ScientistIndexed profile
Oleksandr RudenkoUkraineIMO2011 · 2012Jane StreetQuantitative TraderAutumn profileOROleksandr RybakUkraineIMO2002Institute of Mathematics, NAS of UkraineMathematician (former researcher), Theory of Dynamical Systems and Fractal AnalysisAutumn profileOROleksandr RybakUkraineIMO1996Competition recordBronze medalOTOleksandr TsymbalyukUkraineIMO2004Prog.kiev.uaJava trainerIndexed profileOVOleksandr VoitovychUkraineIMO2019Dot AnalyticsJunior Data AnalystIndexed profile
Oleksii MasalitinUkraineIMO2020Atto TradingJunior Quant ResearcherAutumn profileOKOleksiy KislinskyiUkraineIMO2011GoogleSoftware EngineerIndexed profileOKOleksiy KravchenkoUkraineIMO2000ZoralSenior Data ScientistIndexed profileOROleksiy RudenkoUkraineIMO1997Competition recordSilver medalOMOle Marius StrøhmNorwayIMO2017ArmSenior Software EngineerIndexed profileOLOlemis Lang CaminaCubaIMO1999MakercitosFounderIndexed profileOBOlena BormashenkoCanadaIMO2002 · 2003Competition recordSilver medal · Gold medalIndexed profileOHOles HolembovskyyUkraineIMO2019Matter LabsIndexed profileOHOles HordiichukUkraineIMO2024 · 2025ETH ZürichDoctoral Student / Scientific AssistantIndexed profileOBOlga BurovaRussian FederationIMO2011Competition recordSilver medal
Oisín Flynn-ConnollyIrelandIMO2014 · 2015Leiden UniversityPostdocAutumn profileOVOjārs Vilmārs RatnieksLatviaIOI2012 · 2013GoogleSoftware EngineerIndexed profileOGOjas GulatiUnited KingdomIOI2022Competition recordHonourable mentionOMOjas MittalIndiaIMO2019University of OxfordIndexed profileOWOkechukwu Williams OkekeNigeriaIMO2017 · 2018Special Maths AcademySenior Maths InstructorIndexed profileOUOkezie Uzochukwu ChiedozieNigeriaIMO2020BloombergSoftware Engineering InternIndexed profileOBOlaf BöhmeGerman Democratic RepublicIMO1970 · 1972Competition recordBronze medal · Silver medalOKOlaf KlugeGermanyIOI1991Competition recordSilver medalOlaf TargowskiPolandIOI2023Competition recordBronze medalAutumn profileOHOlav Hellebust HaalandNorwayIMO2019Competition recordHonourable mentionOPOlavo Paschoal LongoBrazilIMO2021 · 2022Competition recordSilver medal · Gold medalIndexed profileOlcay OransoyTürkiyeIOI2021Competition recordBronze medalAutumn profileOAOleg AlexandrovRepublic of MoldovaIMO1994NASA Ames Research CenterComputer vision engineerIndexed profileOBOleg BondarenkoUnion of Soviet Socialist RepublicsIMO1985Competition recordSilver medalOGOleg Gol'bergRussian Federation, United States of AmericaIMO2002 · 2003 · 2004ToastLead Principal Engineer / Architect, CommerceIndexed profileOIOleg IvanovRussiaIOI2012Samsung R&D Institute & AI Center RussiaIndexed profileOIOleg IvriiCanadaIMO2003 · 2004Competition recordBronze medal · Honourable mentionOKOleg KošikEstoniaIMO2003University of TartuResearch ScientistIndexed profileOKOleg Krestev MushkarovBulgariaIMO1969Competition recordBronze medalOLOleg LyashkoUnion of Soviet Socialist RepublicsIMO1971Competition recordSilver medalOMOleg MürkEstoniaIOI1996 · 1997Competition recordSilver medal · Gold medalIndexed profileOPOleg PetšonkinEstoniaIMO2001Competition recordBronze medalOMOļegs MatvejevsLatviaIMO2014Competition recordHonourable mentionOSOleg SmirnovRussian FederationIMO2019Competition recordGold medalOOOļegs OšmjansLatviaIMO2010Competition recordHonourable mentionOOOļegs OšmjansLatviaIOI2008 · 2009 · 2010Competition recordBronze medalOSOleg StyrtRussian FederationIMO2002Competition recordGold medalOUOļegs UrziksLatviaIOI2003 · 2004 · 2005MetaAndroid Software EngineerIndexed profileOTOleg TaborovetsBelarusIOI1990TollNetSoftware EngineerIndexed profileOZOleg ZlydenkoIsraelIMO2006 · 2007 · 2008GoogleSenior Software EngineerIndexed profileOleh NaverUkraineIOI2020 · 2021 · 2022Competition recordSilver medal · Gold medalAutumn profileOROleh RudenkoUkraineIMO2017Competition recordSilver medalOleksandr BaganUkraineIMO2011Neo CyberneticaSenior Machine Learning EngineerAutumn profileOCOleksandr ChuklinUkraineIMO2005 · 2006Google DeepMindResearch EngineerIndexed profileOGOleksandr GalkinUkraineIOI2003Competition recordBronze medalOGOleksandr GrushetskyyUkraineIOI1998Competition recordSilver medalOHOleksandr HorbunovUkraineIMO2025 · 2026Competition recordSilver medal · Gold medalOIOleksandr IotkoUkraineIOI1999UBISIndexed profileOKOleksandr KorniienkoUkraineIMO1992CelayixDirector of Engineering & TechnologyIndexed profileOKOleksandr KravetsUkraineIMO2005Columbia UniversityPostdoctoral Research ScientistIndexed profileOleksandr RudenkoUkraineIMO2011 · 2012Jane StreetQuantitative TraderAutumn profileOROleksandr RybakUkraineIMO2002Institute of Mathematics, NAS of UkraineMathematician (former researcher), Theory of Dynamical Systems and Fractal AnalysisAutumn profileOROleksandr RybakUkraineIMO1996Competition recordBronze medalOTOleksandr TsymbalyukUkraineIMO2004Prog.kiev.uaJava trainerIndexed profileOVOleksandr VoitovychUkraineIMO2019Dot AnalyticsJunior Data AnalystIndexed profileOleksii MasalitinUkraineIMO2020Atto TradingJunior Quant ResearcherAutumn profileOKOleksiy KislinskyiUkraineIMO2011GoogleSoftware EngineerIndexed profileOKOleksiy KravchenkoUkraineIMO2000ZoralSenior Data ScientistIndexed profileOROleksiy RudenkoUkraineIMO1997Competition recordSilver medalOMOle Marius StrøhmNorwayIMO2017ArmSenior Software EngineerIndexed profileOLOlemis Lang CaminaCubaIMO1999MakercitosFounderIndexed profileOBOlena BormashenkoCanadaIMO2002 · 2003Competition recordSilver medal · Gold medalIndexed profileOHOles HolembovskyyUkraineIMO2019Matter LabsIndexed profileOHOles HordiichukUkraineIMO2024 · 2025ETH ZürichDoctoral Student / Scientific AssistantIndexed profileOBOlga BurovaRussian FederationIMO2011Competition recordSilver medal