All medalists.
IMO & IOI, including honourable mentions.
LGLeandro GroismanArgentinaIMO2000 · 2001 · 2002BrightSectorFounder and CEOIndexed profileLGLeandro GroismanArgentinaIOI2001BrightSectorFounder and CEOIndexed profileLSLeandro SaitaArgentinaIMO1994 · 1995Oscar LarrauriEspecialista en implementación de sistemasIndexed profileLALeart AjvazajKosovoIMO2019Gjirafa, Inc.Business Intelligence InternIndexed profileLBLê Bá Khánh TrìnhVietnamIMO1979MyselfActor ModelIndexed profileLCLê Công ĐinhVietnamIMO2013Competition recordSilver medalLCLee Cho-YinTaiwanIMO1996Competition recordBronze medalIndexed profileLNLeenhapong NavaravongThailandIMO1997University of Utah HealthAssistant Professor of MedicineIndexed profileLHLe Hong VietVietnamIOI1998 · 1999FPT Smart CloudChief Executive OfficerIndexed profileLHLê Hữu PhướcVietnamIMO2011Competition recordBronze medalLMLeia Mayssa MasyerinMalaysiaIMO2022 · 2023 · 2024Competition recordHonourable mention · Bronze medalIndexed profileLCLei ChenChinaIOI1996 · 1997Competition recordGold medal · Bronze medalLFLei FuChinaIMO2007Competition recordGold medalLLLei LeiSingaporeIMO2007 · 2008ApodexAI ScientistIndexed profileLZLei ZhangChinaIMO1993Competition recordGold medalLMLe Manh HaVietnamIOI2004Competition recordBronze medalLDLénárd Dániel VirágFinlandIMO2025Competition recordHonourable mention
Lenart DolinarSloveniaIMO2023Maven SecuritiesTrading InternAutumn profileLNLê Ngọc AnhVietnamIMO2008Competition recordGold medalLNLê Ngọc ChuyenVietnamIMO1976Institute of Mathematics, Vietnam Academy of Science and TechnologyResearcher, Department of Probability and Statistics (as of 1995)Autumn profileLNLê Ngọc MinhVietnamIMO1976Competition recordBronze medalLNLenhard NgUnited States of AmericaIMO1991 · 1992 · 1993Competition recordSilver medal · Gold medalIndexed profileLNLe Nhat Nam NguyenVietnamIMO2026Competition recordGold medalLNLê Như DươngVietnamIMO1978VietcombankBankIndexed profileLBLenilson Barreira de MoraisBrazilIMO1988Alloha FibraDiretor de Transformação OrganizacionalIndexed profileLKLenka KopfováCzech RepublicIMO2018 · 2019Competition recordBronze medalIndexed profileLSLenka SlavíkováCzech RepublicIMO2007Competition recordBronze medalLCLennart Christian GrabbelGermanyIMO2020 · 2021Competition recordSilver medal · Gold medalIndexed profileLFLennart FerlemannGermanyIOI2019Competition recordBronze medalLTLenny TaelmanBelgiumIMO1998University of AmsterdamProfessorIndexed profileLFLeo FengCanadaIOI2017Competition recordBronze medalLHLeo HatvaniBosnia and HerzegovinaIOI2004Mälardalen UniversityLecturerIndexed profileLILeonard InkretCroatiaIOI2018Mireo d.d.Indexed profileLKLeonard KottischGermanyIMO2023 · 2024Competition recordBronze medalLALeonardo Andres Marciaga SantanaPanamaIMO2018 · 2020Illinois Institute of TechnologyResearch AssistantIndexed profileLALeonardo Ariel García MoránMexicoIMO2015 · 2016 · 2017Competition recordBronze medal · Silver medalLCLeonardo Caiano TavaresPortugalIMO2020 · 2022Competition recordBronze medalLCLeonardo Costa LesageSpainIMO2019 · 2020 · 2021Universitat Politècnica de CatalunyaIndexed profileLFLeonardo FlórezColombiaIMO2012 · 2013Competition recordBronze medalLHLeonardo Henrique Fakhreddine MaldonadoBrazilIMO2023Competition recordSilver medalLMLeonardo MarciagaPanamaIMO2019Competition recordHonourable mentionLMLeonardo Mikel Cervantes MateosMexicoIMO2022Competition recordBronze medalLRLeonardo Ribeiro de Castro CarvalhoBrazilIMO2006Nilo SaúdeIndexed profileLULeonardo UrbinaVenezuelaIMO2004Competition recordHonourable mentionLVLeonardo Valente NascimentoBrazilIOI2022 · 2023IncogniaData Science InternIndexed profileLVLeonardo ValerianIndonesiaIMO2025Competition recordHonourable mentionLZLeonardo ZambranoEcuadorIMO2020Competition recordHonourable mentionLRLeonel RequenaPeruIMO1997 · 1998Omnisys PerúLead Sales EngineerIndexed profileLRLeonel Robert GonzalezCubaIMO1993University of Louisiana at LafayetteProfessorIndexed profileLKLeong Kit WongMacauIMO2015Competition recordHonourable mentionLHLeonhard HaslerLiechtensteinIMO2023 · 2024 · 2025MATHEMATICAL.OLYMPIAD.CHTeacherIndexed profileLCLeonid CuklevNorth MacedoniaIOI2025Competition recordSilver medalLPLéonide ParnovskiUnion of Soviet Socialist RepublicsIMO1983UCLprofessorIndexed profileLOLeonid OridorogaUnion of Soviet Socialist RepublicsIMO1984Competition recordGold medalLTLeonid TodoroskiNorth MacedoniaIMO2024 · 2025 · 2026Competition recordBronze medal · Honourable mentionIndexed profileLJLeon JacobsNetherlandsIMO1992Competition recordHonourable mentionLMLeon MagdićYugoslaviaIOI1990InfobipIT Consultant (BIG DATA)Indexed profileLSLeon StarešinićCroatiaIMO2016Competition recordBronze medalIndexed profileLPLeopold PartsEstoniaIMO2000 · 2001Wellcome Sanger InstituteGroup LeaderIndexed profile
Leo VarisFinlandIOI2022 · 2023G-ResearchSoftware EngineerAutumn profile
Lenart DolinarSloveniaIMO2023Maven SecuritiesTrading InternAutumn profileLNLê Ngọc AnhVietnamIMO2008Competition recordGold medalLNLê Ngọc ChuyenVietnamIMO1976Institute of Mathematics, Vietnam Academy of Science and TechnologyResearcher, Department of Probability and Statistics (as of 1995)Autumn profileLNLê Ngọc MinhVietnamIMO1976Competition recordBronze medalLNLenhard NgUnited States of AmericaIMO1991 · 1992 · 1993Competition recordSilver medal · Gold medalIndexed profileLNLe Nhat Nam NguyenVietnamIMO2026Competition recordGold medalLNLê Như DươngVietnamIMO1978VietcombankBankIndexed profileLBLenilson Barreira de MoraisBrazilIMO1988Alloha FibraDiretor de Transformação OrganizacionalIndexed profileLKLenka KopfováCzech RepublicIMO2018 · 2019Competition recordBronze medalIndexed profileLSLenka SlavíkováCzech RepublicIMO2007Competition recordBronze medalLCLennart Christian GrabbelGermanyIMO2020 · 2021Competition recordSilver medal · Gold medalIndexed profileLFLennart FerlemannGermanyIOI2019Competition recordBronze medalLTLenny TaelmanBelgiumIMO1998University of AmsterdamProfessorIndexed profileLFLeo FengCanadaIOI2017Competition recordBronze medalLHLeo HatvaniBosnia and HerzegovinaIOI2004Mälardalen UniversityLecturerIndexed profileLILeonard InkretCroatiaIOI2018Mireo d.d.Indexed profileLKLeonard KottischGermanyIMO2023 · 2024Competition recordBronze medalLALeonardo Andres Marciaga SantanaPanamaIMO2018 · 2020Illinois Institute of TechnologyResearch AssistantIndexed profileLALeonardo Ariel García MoránMexicoIMO2015 · 2016 · 2017Competition recordBronze medal · Silver medalLCLeonardo Caiano TavaresPortugalIMO2020 · 2022Competition recordBronze medalLCLeonardo Costa LesageSpainIMO2019 · 2020 · 2021Universitat Politècnica de CatalunyaIndexed profileLFLeonardo FlórezColombiaIMO2012 · 2013Competition recordBronze medalLHLeonardo Henrique Fakhreddine MaldonadoBrazilIMO2023Competition recordSilver medalLMLeonardo MarciagaPanamaIMO2019Competition recordHonourable mentionLMLeonardo Mikel Cervantes MateosMexicoIMO2022Competition recordBronze medalLRLeonardo Ribeiro de Castro CarvalhoBrazilIMO2006Nilo SaúdeIndexed profileLULeonardo UrbinaVenezuelaIMO2004Competition recordHonourable mentionLVLeonardo Valente NascimentoBrazilIOI2022 · 2023IncogniaData Science InternIndexed profileLVLeonardo ValerianIndonesiaIMO2025Competition recordHonourable mentionLZLeonardo ZambranoEcuadorIMO2020Competition recordHonourable mentionLRLeonel RequenaPeruIMO1997 · 1998Omnisys PerúLead Sales EngineerIndexed profileLRLeonel Robert GonzalezCubaIMO1993University of Louisiana at LafayetteProfessorIndexed profileLKLeong Kit WongMacauIMO2015Competition recordHonourable mentionLHLeonhard HaslerLiechtensteinIMO2023 · 2024 · 2025MATHEMATICAL.OLYMPIAD.CHTeacherIndexed profileLCLeonid CuklevNorth MacedoniaIOI2025Competition recordSilver medalLPLéonide ParnovskiUnion of Soviet Socialist RepublicsIMO1983UCLprofessorIndexed profileLOLeonid OridorogaUnion of Soviet Socialist RepublicsIMO1984Competition recordGold medalLTLeonid TodoroskiNorth MacedoniaIMO2024 · 2025 · 2026Competition recordBronze medal · Honourable mentionIndexed profileLJLeon JacobsNetherlandsIMO1992Competition recordHonourable mentionLMLeon MagdićYugoslaviaIOI1990InfobipIT Consultant (BIG DATA)Indexed profileLSLeon StarešinićCroatiaIMO2016Competition recordBronze medalIndexed profileLPLeopold PartsEstoniaIMO2000 · 2001Wellcome Sanger InstituteGroup LeaderIndexed profileLeo VarisFinlandIOI2022 · 2023G-ResearchSoftware EngineerAutumn profile