All medalists.
IMO & IOI, including honourable mentions.
GJGuido Jorge Castro OdioCubaIMO1990Global PC Desarrolladores InformáticosManaging Director, Global PC Desarrolladores Informáticos; Associate ProfessorAutumn profileGLGuido LidoItalyIMO2011Universiteit LeidenIndexed profile
Guido van RossumNetherlandsIMO1974MicrosoftRetiredAutumn profileGDGuilherme Duarte CabralPortugalIMO2026Competition recordHonourable mentionGIGuilherme Issao Camarinha FujiwaraBrazilIMO2002Competition recordBronze medalGIGuilherme Issao C. FujiwaraBrazilIOI2003WaymoPrincipal Software EngineerIndexed profileGPGuilherme Phillipe FigueiredoBrazilIMO2007Competition recordHonourable mentionGRGuilherme Rodrigues Nogueira de SouzaBrazilIMO2005 · 2006UERJProfessor adjuntoIndexed profile
Guilherme Zeus Dantas e MouraBrazilIMO2019 · 2020University of WaterlooPhD Student (Combinatorics & Optimization)Autumn profileGBGuillaume BrunerieFranceIMO2007ELK StudiosDeveloper (Game Logic, Animation Tools, Game Client)Indexed profileGRGuillaume RyderFranceIOI2001Competition recordBronze medal
Guillaume TexierFranceIMO1991RexelChief Executive OfficerAutumn profileGVGuillaume VigeralFranceIMO1998Competition recordBronze medalGBGuillem Beltran CerezuelaSpainIMO2023Universitat Politècnica de Catalunya (UPC)Indexed profileGVGuillem VizcarroSpainIOI2026SEIDORIndexed profileGGGuillermo Guerrero SerranoSpainIMO2026Competition recordHonourable mentionGGGunadi GaniIndonesiaIOI2024Competition recordBronze medalGGGunnar Guannan PengSwedenIMO2005 · 2006 · 2007 · 2008Shopee产品经理Indexed profileGPGunnar PengSwedenIOI2008Competition recordSilver medalGRGunnar RyneforsSwedenIMO1968Volvo GroupIT SpecialistIndexed profileGÞGunnsteinn Þór ÓlasonIcelandIOI2026Competition recordHonourable mentionGKGuntars KitenbergsLatviaIMO2005Competition recordHonourable mentionIndexed profileGDGunter DögeGerman Democratic RepublicIMO1986 · 1987DEVK VersicherungenLeiter IT und TelekommunikationIndexed profileGKGünter KleindlAustriaIMO1974AtosStandardisation ManagerIndexed profileGMGünter M. ZieglerGermanyIMO1981Freie Universität BerlinProfessor of MathematicsIndexed profileGPGünter PollakAustriaIMO1981Competition recordGold medalIndexed profileGSGünter SchwarzbauerAustriaIMO1988Competition recordSilver medalGRGünther RotheAustriaIMO1978Competition recordSilver medalGVGunther VogelGermanyIMO1994 · 1995 · 1996Competition recordBronze medal · Gold medalGSGuntur SinardiIndonesiaIMO2003Competition recordHonourable mentionGWGuoheng WeiChinaIMO1988Competition recordSilver medalGLGuolong LiBelgiumIMO2005 · 2006 · 2007Edwance InternationalPortfolio managerAutumn profileGZGuowen ZhangAustraliaIMO2017 · 2018Competition recordSilver medal · Gold medalGMGuram MatcharashviliGeorgiaIMO2022 · 2023Komarovi Campus SchoolOlympiad mathematics teacherIndexed profileGGGurbanberdi GulladyyevTurkmenistanIOI2022United Latino Students AssociationBack End DeveloperIndexed profileGSGurraj SanghaCanadaIMO1988Competition recordHonourable mentionGRGuruge Ruvini AudaryaSri LankaIMO2010Sri Lanka CustomsAssistant Superintendent of CustomsIndexed profileGPGustas PranckietisLithuaniaIMO2022Competition recordHonourable mentionIndexed profileGBGustav Bille GørtzDenmarkIMO2025Landssammenslutningen af HandelsskoleeleverLandsdækkende HHX repræsentant i hovedbestyrelsenIndexed profileGBGustav Bille GørtzDenmarkIOI2024Competition recordHonourable mention
Gustav KalanderSwedenIOI2019 · 2020ZenseactMaster's Thesis (Zenseact)Autumn profileGLGustav LindströmSwedenIOI1998 · 1999 · 2000PostkodlotterietData EngineerIndexed profileGMGustav MatulaCroatiaIOI2011imo.imIndexed profileGCGustavo CruzBrazilIMO2021Competition recordBronze medalGEGustavo Ernesto MassaccesiArgentinaIMO1991UTN - RosarioMiembro del cuerpo docenteIndexed profileGLGustavo Lisbôa EmpinottiBrazilIMO2010 · 2011New York UniversityPhD StudentIndexed profileGMGustavo MassaccesiArgentinaIOI1991UTN - RosarioMiembro del cuerpo docenteIndexed profileGSGustavo Santiago ReyesPuerto RicoIMO2017Competition recordHonourable mentionGGGustavs GaldiņšLatviaIOI1994 · 1995Competition recordBronze medalIndexed profileGGGustavs GritānsLatviaIMO2026Competition recordHonourable mentionGBGuus BerkelmansNetherlandsIMO2010 · 2012113 ZelfmoordpreventieResearcherIndexed profileGAGuy Alexander HerzmarkUnited KingdomIMO1973Guy HerzmarkResearch ConsultantIndexed profileGMGuy MayrazIsraelIMO1990Competition recordBronze medalIndexed profileGOGuy OstfeldIsraelIMO2022Competition recordBronze medalGRGuy RavehIsraelIMO2011GE HealthcareSoftware EngineerIndexed profileGLGvozden LapčevićSerbiaIMO2022 · 2023 · 2024Competition recordSilver medal · Honourable mentionGCGwang Chol LiDemocratic People's Republic of KoreaIMO1992Competition recordSilver medalGCGwang Chon KimDemocratic People's Republic of KoreaIMO2008Competition recordSilver medal
Gyojun YounRepublic of KoreaIOI2018 · 2019ORCA TechnologiesQuantitative DeveloperAutumn profileGSGyong Sik LiDemocratic People's Republic of KoreaIMO1990Competition recordBronze medal
Guido van RossumNetherlandsIMO1974MicrosoftRetiredAutumn profileGDGuilherme Duarte CabralPortugalIMO2026Competition recordHonourable mentionGIGuilherme Issao Camarinha FujiwaraBrazilIMO2002Competition recordBronze medalGIGuilherme Issao C. FujiwaraBrazilIOI2003WaymoPrincipal Software EngineerIndexed profileGPGuilherme Phillipe FigueiredoBrazilIMO2007Competition recordHonourable mentionGRGuilherme Rodrigues Nogueira de SouzaBrazilIMO2005 · 2006UERJProfessor adjuntoIndexed profileGuilherme Zeus Dantas e MouraBrazilIMO2019 · 2020University of WaterlooPhD Student (Combinatorics & Optimization)Autumn profileGBGuillaume BrunerieFranceIMO2007ELK StudiosDeveloper (Game Logic, Animation Tools, Game Client)Indexed profileGRGuillaume RyderFranceIOI2001Competition recordBronze medalGuillaume TexierFranceIMO1991RexelChief Executive OfficerAutumn profileGVGuillaume VigeralFranceIMO1998Competition recordBronze medalGBGuillem Beltran CerezuelaSpainIMO2023Universitat Politècnica de Catalunya (UPC)Indexed profileGVGuillem VizcarroSpainIOI2026SEIDORIndexed profileGGGuillermo Guerrero SerranoSpainIMO2026Competition recordHonourable mentionGGGunadi GaniIndonesiaIOI2024Competition recordBronze medalGGGunnar Guannan PengSwedenIMO2005 · 2006 · 2007 · 2008Shopee产品经理Indexed profileGPGunnar PengSwedenIOI2008Competition recordSilver medalGRGunnar RyneforsSwedenIMO1968Volvo GroupIT SpecialistIndexed profileGÞGunnsteinn Þór ÓlasonIcelandIOI2026Competition recordHonourable mentionGKGuntars KitenbergsLatviaIMO2005Competition recordHonourable mentionIndexed profileGDGunter DögeGerman Democratic RepublicIMO1986 · 1987DEVK VersicherungenLeiter IT und TelekommunikationIndexed profileGKGünter KleindlAustriaIMO1974AtosStandardisation ManagerIndexed profileGMGünter M. ZieglerGermanyIMO1981Freie Universität BerlinProfessor of MathematicsIndexed profileGPGünter PollakAustriaIMO1981Competition recordGold medalIndexed profileGSGünter SchwarzbauerAustriaIMO1988Competition recordSilver medalGRGünther RotheAustriaIMO1978Competition recordSilver medalGVGunther VogelGermanyIMO1994 · 1995 · 1996Competition recordBronze medal · Gold medalGSGuntur SinardiIndonesiaIMO2003Competition recordHonourable mentionGWGuoheng WeiChinaIMO1988Competition recordSilver medalGLGuolong LiBelgiumIMO2005 · 2006 · 2007Edwance InternationalPortfolio managerAutumn profileGZGuowen ZhangAustraliaIMO2017 · 2018Competition recordSilver medal · Gold medalGMGuram MatcharashviliGeorgiaIMO2022 · 2023Komarovi Campus SchoolOlympiad mathematics teacherIndexed profileGGGurbanberdi GulladyyevTurkmenistanIOI2022United Latino Students AssociationBack End DeveloperIndexed profileGSGurraj SanghaCanadaIMO1988Competition recordHonourable mentionGRGuruge Ruvini AudaryaSri LankaIMO2010Sri Lanka CustomsAssistant Superintendent of CustomsIndexed profileGPGustas PranckietisLithuaniaIMO2022Competition recordHonourable mentionIndexed profileGBGustav Bille GørtzDenmarkIMO2025Landssammenslutningen af HandelsskoleeleverLandsdækkende HHX repræsentant i hovedbestyrelsenIndexed profileGBGustav Bille GørtzDenmarkIOI2024Competition recordHonourable mentionGustav KalanderSwedenIOI2019 · 2020ZenseactMaster's Thesis (Zenseact)Autumn profileGLGustav LindströmSwedenIOI1998 · 1999 · 2000PostkodlotterietData EngineerIndexed profileGMGustav MatulaCroatiaIOI2011imo.imIndexed profileGCGustavo CruzBrazilIMO2021Competition recordBronze medalGEGustavo Ernesto MassaccesiArgentinaIMO1991UTN - RosarioMiembro del cuerpo docenteIndexed profileGLGustavo Lisbôa EmpinottiBrazilIMO2010 · 2011New York UniversityPhD StudentIndexed profileGMGustavo MassaccesiArgentinaIOI1991UTN - RosarioMiembro del cuerpo docenteIndexed profileGSGustavo Santiago ReyesPuerto RicoIMO2017Competition recordHonourable mentionGGGustavs GaldiņšLatviaIOI1994 · 1995Competition recordBronze medalIndexed profileGGGustavs GritānsLatviaIMO2026Competition recordHonourable mentionGBGuus BerkelmansNetherlandsIMO2010 · 2012113 ZelfmoordpreventieResearcherIndexed profileGAGuy Alexander HerzmarkUnited KingdomIMO1973Guy HerzmarkResearch ConsultantIndexed profileGMGuy MayrazIsraelIMO1990Competition recordBronze medalIndexed profileGOGuy OstfeldIsraelIMO2022Competition recordBronze medalGRGuy RavehIsraelIMO2011GE HealthcareSoftware EngineerIndexed profileGLGvozden LapčevićSerbiaIMO2022 · 2023 · 2024Competition recordSilver medal · Honourable mentionGCGwang Chol LiDemocratic People's Republic of KoreaIMO1992Competition recordSilver medalGCGwang Chon KimDemocratic People's Republic of KoreaIMO2008Competition recordSilver medalGyojun YounRepublic of KoreaIOI2018 · 2019ORCA TechnologiesQuantitative DeveloperAutumn profileGSGyong Sik LiDemocratic People's Republic of KoreaIMO1990Competition recordBronze medal