Host cities:
| Athlete | Nation(s) | Sport(s) | Role(s) | Era | Notes |
|---|---|---|---|---|---|
| Omar El-Ghazaly | ATH | Olympics | 2004—2012 | 0–2–0 2005 İzmir ATH silver: discus throw; 2007 Bangkok ATH silver: discus throw | |
| Alina Gherasim | ATH | Olympics | 2000 | 0–1–1 1993 Buffalo ATH bronze: 10000 m (competed as Alina Tecuta); 1995 Fukuoka ATH silver: 10000 m (competed as Alina Tecuta) | |
| Simona Gherman | FEN | Olympics | 2012—2016 | 0–1–0 2007 Bangkok FEN silver: épée team (competed as Simona Alexandru) | |
| Gheorghe Ghipu | ATH | Olympics | 1972—1976 | 0–0–1 1975 Roma ATH bronze: 1500 m | |
| Omar Ghonim | TKW | YOG | 2014 | 0–1–0 2019 Napoli silver: Kyorugi team | |
| Shanta Ghosh | ATH | Olympics | 2000 | 0–0–1 1999 Palma de Mallorca ATH bronze: 4×100 m relay | |
| Gi Bo-Bae | ARC | Olympics | 2012—2016 | 5–1–0 2011 Shenzhen ARC gold: recurve, recurve team, and recurve mixed team; 2015 Gwangju ARC gold: recurve and recurve mixed team, silver: recurve team | |
| Ito Giani | ATH | Olympics / Non-starter | 1964—1968 | 1–0–2 1967 Tokyo ATH gold: 4×100 m relay, bronze: 100 m and 200 m | |
| Salvatore Giannone | ATH | Olympics | 1960 | 1–0–0 1959 Torino ATH gold: 4×100 m relay | |
| Gemma Gibbons | JUD | Olympics | 2012 | 0–0–1 2009 Beograd JUD bronze: middleweight -70 kg | |
| James Gibson | SWM | Olympics | 2004 | 2–0–0 2003 Daegu SWI gold: 50 m breaststroke and 100 m breaststroke | |
| Eberhard Gienger | GAR | Olympics | 1972—1976 | 1–0–0 1973 Moskva GYM gold: parallel bars | |
| Marie-Laure Gigon | SHO | Olympics | 2008 | 0–1–0 2011 Shenzhen SHO silver: 50 m rifle three positions team | |
| Glenroy Gilbert | ATH/BOB | Olympics | 1988—2000 | 0–0–1 1993 Buffalo ATH bronze: 100 m | |
| Rick Gilbert | DIV | Olympics | 1968 | 2–0–0 1965 Budapest DIV gold: 3 m springboard and platform | |
| Jarrod Gilchrist | WPO | Olympics | 2016 | 1–0–0 2009 Beograd WAP gold | |
| Alison Gill | ROW | Olympics | 1988—1996 | 0–0–1 1989 Duisburg ROW bronze: single sculls | |
| Jennifer Gillom | BKB | Olympics | 1988 | 0–1–0 1985 Kobe BAS silver | |
| Nailya Gilyazova | FEN | Olympics | 1976—1980 | 0–1–0 1979 Ciudad de México FEN silver: foil team | |
| Nicu Gingă | WRE | Olympics | 1976—1980 | 0–3–0 1973 Moskva WRE silver: Greco-Roman flyweight -52 kg; 1977 Sofia WRE silver: Greco-Roman flyweight -52 kg; 1981 București WRE silver: Greco-Roman flyweight -52 kg | |
| Andrea Giocondi | ATH | Olympics | 1996 | 0–1–0 1995 Fukuoka ATH silver: 1500 m | |
| Salvatore Gionta | WPO | Olympics | 1952—1960 | 0–0–1 1959 Torino WAP bronze | |
| Rossella Giordano | ATH | Olympics | 1996—2004 | 0–3–0 1995 Fukuoka ATH silver: 10 km walk; 1997 Catania ATH silver: 10 km walk; 1999 Palma de Mallorca ATH silver: 10 km walk | |
| David Giralt, Sr. | ATH | Olympics | 1980 | 0–0–1 1977 Sofia ATH bronze: long jump | |
| Marie-Laure Giraudon | SWM | Olympics | 1992 | 0–0–1 1993 Buffalo SWI bronze: 4×200 m freestyle relay | |
| Dan Gîrleanu | VVO | Olympics | 1980 | 1–0–0 1981 București VOL gold | |
| Juan Gisbert | TEN | Non-Medal | 1968 | 1–0–0 1967 Tokyo TEN gold: doubles | |
| Niccolò Gitto | WPO | Olympics | 2012—2016 | 0–1–0 2007 Bangkok WAP silver | |
| Luca Giustolisi | WPO | Olympics | 1996 | 0–0–1 1993 Buffalo WAP bronze | |
| Randy Givens | ATH | Olympics | 1984 | 2–1–0 1983 Edmonton ATH gold: 200 m and 4×100 m relay, silver: 100 m | |
| Dragana Gladović | TKW | Olympics | 2012 | 0–0–1 2015 Gwangju TKW bronze: bantamweight -53 kg | |
| Żaneta Glanc | ATH | Olympics | 2008—2016 | 1–1–0 2009 Beograd ATH silver: discus throw; 2011 Shenzhen ATH gold: discus throw | |
| Harvey Glance | ATH | Olympics / Non-starter | 1976—1984 | 0–0–1 1977 Sofia ATH bronze: 4×100 m relay | |
| Nikita Glasnovic | TKW | Olympics | 2016 | 0–0–1 2015 Gwangju TKW bronze: featherweight -57 kg | |
| Kathy Gleason | GAR | Olympics | 1968 | 0–1–0 1967 Tokyo GYM silver: team | |
| Antje Gleichfeld | ATH | Olympics | 1960—1964 | 1–3–1 1959 Torino ATH bronze: 4×100 m relay (competed for West Germany); 1961 Sofia ATH gold: 800 m (competed for West Germany); 1963 Porto Alegre ATH silver: 800 m and 4×100 m relay (competed for West Germany); 1965 Budapest ATH silver: 800 m (competed for West Germany) | |
| Bogdan Glivenko | VVO | YOG | 2010 | 0–1–0 2017 Taipei VOL silver | |
| Traugott Glöckler | ATH | Olympics | 1968—1972 | 0–1–0 1967 Tokyo ATH silver: shot put | |
| Wiesław Glos | FEN | Olympics | 1960—1964 | 0–1–0 1959 Torino FEN silver: épée team | |
| Hansi Gnad | BKB | Olympics | 1992 | 0–0–1 1989 Duisburg BAS bronze (competed for West Germany) | |
| Marek Gniewkowski | FEN | Olympics | 1988—1992 | 1–0–0 1989 Duisburg FEN gold: sabre team | |
| Go Gyeong-Du | JUD | Olympics | 2000 | 0–0–1 1995 Fukuoka JUD bronze: open class | |
| Go Seong-Hyeon | BDM | Olympics | 2012—2016 | 3–0–0 2013 Kazan BDM gold: doubles and team; 2015 Gwangju BDM gold: team | |
| Frans Göbel | ROW | Olympics | 1984—1992 | 1–0–0 1987 Zagreb ROW gold: lightweight single sculls | |
| Valery Goborov | BKB | Olympics | 1988 | 1–0–0 1985 Kobe BAS gold | |
| Igor Gočanin | WPO | Olympics | 1988 | 0–0–1 1987 Zagreb WAP bronze | |
| Bev Goddard-Callender | ATH | Olympics | 1976—1984 | 1–2–2 1979 Ciudad de México ATH silver: 4×100 m relay, bronze: 100 m and 200 m (competed as Bev Goddard; 1981 București ATH gold: 100 m, silver: 4×100 m relay (competed as Bev Goddard) | |
| Jernej Godec | SWM | Olympics | 2004—2008 | 1–0–0 2009 Beograd SWI gold: 50 m butterfly | |
| Tanya Gogova | VVO | Olympics | 1980 | 0–0–1 1970 Torino VOL bronze | |
| Scott Goldblatt | SWM | Olympics | 2000—2004 | 1–1–0 1997 Catania SWI gold: 4×200 m freestyle relay, silver: 200 m freestyle | |
| Sabrina Goleš | TEN | Olympics / Non-Medal | 1984—1988 | 1–0–1 1987 Zagreb TEN gold: mixed doubles, bronze: singles | |
| Slađana Golić | BKB | Olympics | 1984—1988 | 1–0–1 1983 Edmonton BAS bronze; 1987 Zagreb BAS gold | |
| Julian Golley | ATH | Olympics | 1992 | 0–0–1 1993 Buffalo ATH bronze: triple jump | |
| Lyudmila Golomazova | ATH | Olympics | 1968 | 1–0–0 1970 Torino ATH gold: 4×100 m relay | |
| Olga Golovkina | ATH | Olympics | 2012 | 1–0–0 2013 Kazan ATH gold: 5000 m | |
| João Gomes Júnior | SWM | Olympics | 2016 | 0–1–1 2011 Shenzhen SWI silver: 50 m breaststroke, bronze: 100 m breaststroke | |
| Anselmo Gomes | ATH | Olympics | 2008 | 1–0–1 2003 Daegu ATH gold: 110 m hurdles; 2007 Bangkok ATH bronze: 110 m hurdles | |
| Flávia Gomes | JUD | YOG | 2010 | 0–0–1 2015 Gwangju JUD bronze: team | |
| Naide Gomes | ATH | Olympics / Opening Flagbearer | 2000—2008 | 0–1–0 2005 İzmir ATH silver: long jump (competed for Portugal) | |
| Gertrudis Gómez | BKB | Olympics | 1996 | 0–1–0 1993 Buffalo BAS silver | |
| Iñaki Gómez | ATH | Olympics | 2012—2016 | 0–0–1 2013 Kazan ATH bronze: 20 km walk team | |
| José Gómez | ATH | Olympics | 1980—1984 | 0–1–0 1979 Ciudad de México ATH silver: 5000 m | |
| Laura Gómez | JUD | Olympics | 2016 | 1–0–0 2009 Beograd JUD gold: half-lightweight -52 kg | |
| João Gonçalves Filho | SWM/WPO | Olympics / Opening Flagbearer | 1952—1968 | 0–0–1 1963 Porto Alegre WAP bronze | |
| Svetlana Goncharenko | ATH | Olympics | 1996—2000 | 1–0–0 1997 Catania ATH gold: 4×400 m relay | |
| Nataliya Goncharova | DIV | Olympics | 2004—2008 | 0–1–1 2007 Bangkok DIV bronze: team; 2013 Kazan DIV silver: synchronized platform | |
| Ivett Gonda | TKW | Olympics | 2004—2008 | 0–0–1 2011 Shenzhen TKW bronze: bantamweight -53 kg | |
| Gong Jinjie | CTR | Olympics | 2012—2016 | 1–0–0 2011 Shenzhen CYC gold: 500 m time trial | |
| Tatyana Gonobobleva | VVO | Olympics | 1972 | 2–0–0 1970 Torino VOL gold (competed as Tatyana Semyonova); 1973 Moskva VOL gold | |
| Bogdan Gonsior | FEN | Olympics | 1960—1972 | 3–1–1 1959 Torino FEN silver: épée team; 1961 Sofia FEN gold: épée; 1963 Porto Alegre FEN gold: foil team and épée team; 1965 Budapest FEN bronze: épée team | |
| Driulis González | JUD | Olympics | 1992—2008 | 2–0–1 1995 Fukuoka JUD gold: lightweight -56 kg, bronze: team; 1999 Palma de Mallorca JUD gold: lightweight -57 kg | |
| Emeterio González | ATH | Olympics | 1996—2000 | 0–1–0 1997 Catania ATH silver: javelin throw | |
| Heriberto González | FEN | Olympics | 1980 | 0–0–2 1981 București FEN bronze: foil team; 1983 Edmonton FEN bronze: foil team | |
| Joel González | TKW | Olympics | 2012—2016 | 0–0–1 2015 Gwangju TKW bronze: featherweight -68 kg | |
| Leyanet González | GAR | Olympics | 2004 | 0–1–1 1997 Catania GYM silver: balance beam, bronze: floor | |
| Mario González | SWM | Olympics | 1992—1996 | 1–0–1 1993 Buffalo SWI gold: 200 m breaststroke, bronze: 100 m breaststroke | |
| Misleydis González | ATH | Olympics | 2004—2012 | 0–0–1 2005 İzmir ATH bronze: shot put | |
| Duncan Goodhew | SWM | Olympics | 1976—1980 | 0–1–0 1977 Sofia SWI silver: 100 m breaststroke | |
| Marquise Goodwin | ATH | Olympics | 2012 | 0–1–0 2011 Shenzhen ATH silver: long jump | |
| Wilma van Gool-van den Berg | ATH | Olympics | 1968—1972 | 0–1–1 1970 Torino ATH silver: 100 m, bronze: 200 m (competed as Wilma van den Berg) | |
| Radvilas Gorauskas | BKB | Olympics | 1972 | 1–0–0 1963 Porto Alegre BAS gold | |
| Larisa Gorchakova | SWM | Olympics | 1980 | 3–0–0 1983 Edmonton SWI gold: 100 m backstroke, 200 m backstroke, and 4×100 m medley relay | |
| Yelena Gorchakova | ATH | Olympics | 1952—1964 | 1–0–0 1961 Sofia ATH gold: javelin throw | |
| Paige Gordon | DIV | Olympics | 1992—1996 | 0–3–0 1991 Sheffield DIV silver: team; 1993 Buffalo DIV silver: 3 m springboard and team | |
| Alina Goreac | GAR | Olympics | 1972 | 2–1–0 1977 Sofia GYM gold: all-around and uneven bars, silver: team | |
| Mikhail Gorelik | SWM | Olympics | 1976—1980 | 1–0–0 1979 Ciudad de México SWI gold: 200 m butterfly | |
| Karina Goricheva | WLF | Olympics | 2016 | 0–2–0 2013 Kazan WLT silver: middleweight -63 kg; 2017 Taipei WLT silver: light-heavyweight -69 kg | |
| Giulia Gorlero | WPO | Olympics | 2012—2016 | 0–0–1 2013 Kazan WAP bronze | |
| Christine Gosden | SWM | Olympics | 1956—1960 | 2–4–0 1959 Torino SWI gold: 200 m breaststroke and 4×100 m freestyle relay, silver: 400 m freestyle, 100 m butterfly, and 4×100 m medley relay; 1961 Sofia SWI silver: 200 m breaststroke | |
| Kennedy Goss | SWM | Olympics | 2016 | 1–0–0 2017 Taipei SWI gold: 4×100 m freestyle relay (swam in heats only) | |
| Nicole Goullieux | ATH | Olympics | 1960 | 1–0–0 1959 Torino ATH gold: 800 m | |
| Matthieu Gourdain | FEN | Olympics | 2000 | 0–1–0 1995 Fukuoka FEN silver: sabre team | |
| Cynthia Goyette | SWM | Olympics | 1964 | 2–1–0 1967 Tokyo SWI gold: 200 m breaststroke and 4×100 m medley relay, silver: 100 m breaststroke | |
| Uwe Grabe | ATH | Olympics | 1968 | 0–0–1 1970 Torino ATH bronze: shot put | |
| Maciej Grabowski | SAL | Olympics | 2000—2008 | 1–0–0 1999 Palma de Mallorca SAI gold: Laser | |
| Sam Graddy | ATH | Olympics | 1984 | 1–0–1 1983 Edmonton ATH gold: 4×100 m relay, bronze: 100 m | |
| Nicoleta Grădinaru-Grasu | ATH | Olympics | 1992—2012 | 1–0–1 1997 Catania ATH bronze: shot put (competed as Nicoleta Grasu); 1999 Palma de Mallorca ATH gold: shot put (competed as Nicoleta Grasu) | |
| Martine Grael | SAL | Olympics | 2016—2024 | 0–0–1 2011 Shenzhen SAI bronze: 470 mixed team | |
| Anne-Caroline Graffe | TKW | Olympics | 2012 | 0–0–1 2011 Shenzhen TKW bronze: middleweight -73 kg | |
| Phil Graham | ROW | Olympics | 1996—2000 | 1–1–0 1993 Buffalo ROW gold: coxless pairs, silver: quadruple sculls | |
| Margherita Granbassi | FEN | Olympics | 2004—2008 | 2–2–0 1999 Palma de Mallorca FEN gold: foil team; 2001 Beijing FEN silver: foil team; 2005 İzmir FEN gold: foil team, silver: foil | |
| Nicola Granieri | FEN | Olympics | 1964—1976 | 1–3–3 1963 Porto Alegre FEN bronze: sabre team; 1967 Tokyo FEN gold: sabre team, silver: épée and foil team, bronze: foil; 1970 Torino FEN silver: épée, bronze: épée team | |
| Benjamin Grant | ATH | Olympics | 1988—1992 | 0–1–0 1991 Sheffield ATH silver: 4×100 m relay | |
| Dylan Grant | ATH | Non-starter | 2008 | 0–1–0 2007 Bangkok ATH silver: 4×400 m relay | |
| Alla Grebennikova | SWM | Olympics | 1968 | 0–1–1 1970 Torino SWI silver: 100 m breaststroke, bronze: 200 m breaststroke | |
| Florica Grecescu | ATH | Olympics | 1960 | 0–1–0 1961 Sofia ATH silver: 800 m | |
| Andrey Grechin | SWM | Olympics | 2008—2016 | 4–1–1 2007 Bangkok SWI gold: 100 m freestyle and 4×100 m medley relay, bronze: 4×100 m freestyle relay; 2013 Kazan SWI gold: 4×100 m freestyle relay and 4×100 m medley relay, silver: 50 m freestyle | |
| Yelizaveta Grechishnikova | ATH | Olympics | 2012 | 0–0–1 2007 Bangkok ATH bronze: 5000 m | |
| Dan Grecu | GAR | Olympics / Referee | 1972—2008 | 2–0–2 1973 Moskva GYM gold: rings, bronze: horizontal bar and team; 1977 Sofia GYM gold: rings | |
| John Gregorek, Sr. | ATH | Olympics | 1984 | 1–0–0 1981 București ATH gold: 3000 m steeplechase | |
| Jadel Gregório | ATH | Olympics | 2004—2008 | 0–0–1 2001 Beijing ATH bronze: triple jump | |
| Elvis Gregory | FEN | Olympics | 1992—2000 | 3–1–0 1989 Duisburg FEN gold: foil team; 1993 Buffalo FEN gold: foil team; 1995 Fukuoka FEN gold: foil; 1997 Catania FEN silver: foil team | |
| Matt Grevers | SWM | Olympics | 2008—2012 | 1–3–2 2005 İzmir SWI silver: 100 m backstroke and 4×100 m medley relay, bronze: 50 m backstroke and 4×100 m freestyle relay; 2007 Bangkok SWI gold: 4×100 m freestyle relay, silver: 4×100 m medley relay | |
| Denis Gribanov | SAL | Olympics | 2016—2020 | 2–0–0 2011 Shenzhen SAI gold: 470 mixed and 470 mixed team | |
| Anca Grigoraș | GAR | Olympics / Referee | 1972—2016 | 0–4–2 1977 Sofia GYM silver: balance beam and team, bronze: horse vault; 1979 Ciudad de México GYM silver: balance beam and team, bronze: uneven bars | |
| Kirill Grigoryan | SHO | Olympics | 2016 | 1–2–2 2013 Kazan SHO silver: 50 m rifle three positions team, bronze: 50 m rifle prone team; 2015 Gwangju SHO gold: 50 m rifle prone, silver: 50 m rifle three positions, bronze: 50 m rifle three positions team | |
| Aleksandr Grigoryev | ATH | Olympics | 1980 | 0–0–1 1977 Sofia ATH bronze: high jump | |
| Vyacheslav Grigoryev | FEN | Olympics | 1992—1996 | 0–1–0 1987 Zagreb FEN silver: foil team (competed for the Soviet Union) | |
| Nataliya Grigoryeva | ROW | Olympics | 1992 | 0–1–0 1989 Duisburg ROW silver: quadruple sculls | |
| Lina Grinčikaitė | ATH | Olympics | 2008—2012 | 1–1–1 2009 Beograd ATH gold: 100 m; 2011 Shenzhen ATH bronze: 100 m; 2013 Kazan ATH silver: 100 m | |
| David Grindley | ATH | Olympics | 1992 | 0–0–1 1995 Fukuoka ATH bronze: 4×400 m relay | |
| Anatol Grințescu | WPO | Olympics / Coach | 1960—1980 | 0–0–1 1965 Budapest WAP bronze | |
| Anna Grinyova | WPO | Olympics | 2016 | 1–0–1 2009 Beograd WAP bronze; 2013 Kazan WAP gold | |
| Nadezhda Grishayeva | BKB | Olympics | 2012 | 0–1–0 2013 Kazan BAS silver | |
| Alla Grishchenkova | SWM | Olympics | 1980 | 0–1–1 1979 Ciudad de México SWI silver: 200 m butterfly, bronze: 100 m butterfly | |
| Yevgeny Grishin | WPO | Olympics | 1980—1988 | 1–0–0 1985 Kobe WAP gold | |
| Mindaugas Griškonis | ROW | Olympics | 2008—2020 | 1–0–0 2013 Kazan ROW gold: single sculls | |
| Igor Grivennikov | SWM | Olympics | 1972 | 0–1–0 1973 Moskva SWI silver: 4×100 m freestyle relay | |
| Patrick Groc | FEN | Olympics | 1984—1992 | 0–1–0 1985 Kobe FEN silver: foil team | |
| Tim Grohmann | ROW | Olympics | 2012 | 0–0–1 2015 Gwangju ROW bronze: double sculls | |
| Mariya Gromova | SWM | Olympics | 2012 | 1–0–0 2013 Kazan SWI gold: 4×100 m medley relay (swam in heats only) | |
| Gian Corrado Gross | SWM | Olympics | 1964 | 0–1–0 1963 Porto Alegre SWI silver: 4×100 m medley relay | |
| Julie-Anne Gross | FEN | Olympics | 1992 | 0–0–1 1993 Buffalo FEN bronze: foil team | |
| Michael Groß | SWM | Olympics | 1984—1988 | 1–2–2 1985 Kobe SWI gold: 200 m butterfly, silver: 4×100 m freestyle relay and 4×200 m freestyle relay, bronze: 100 m butterfly and 4×100 m medley relay | |
| Anca Groza | SWM | Olympics | 1972 | 0–0–1 1977 Sofia SWI bronze: 100 m butterfly (competed as Anca Miclaus) | |
| Svetlana Grozdova | GAR | Olympics | 1976 | 1–1–0 1979 Ciudad de México GYM gold: team, silver: balance beam | |
| Gauthier Grumier | FEN | Olympics | 2012—2016 | 0–2–0 2005 İzmir FEN silver: épée team; 2007 Bangkok FEN silver: épée team | |
| Krzysztof Grzegorek | FEN | Olympics | 1972 | 0–0–1 1973 Moskva FEN bronze: sabre team | |
| Gu Bon-Chan | ARC | Olympics | 2016 | 1–1–0 2015 Gwangju ARC gold: recurve team, silver: recurve | |
| Gu Bon-Gil | FEN | Olympics / Opening Flagbearer | 2012—2024 | 1–1–1 2011 Shenzhen FEN silver: sabre, bronze: sabre team; 2017 Taipei FEN gold: sabre team | |
| Gu Junjie | ATH | Olympics | 2008 | 1–0–0 2003 Daegu ATH gold: triple jump | |
| Gu Sang-Beom | FBL | Olympics | 1988 | 0–1–0 1987 Zagreb FTB silver | |
| Gu Seong-Eun | CRD | Olympics | 2008 | 1–0–0 2011 Shenzhen CYC gold: road race | |
| Guan Yingnan | ATH | Olympics | 2000—2004 | 0–1–0 2001 Beijing ATH silver: long jump | |
| Pete Guarasci | BKB | Olympics | 2000 | 0–0–1 1995 Fukuoka BAS bronze | |
| Marcello Guarducci | SWM | Olympics | 1972—1984 | 1–0–0 1979 Ciudad de México SWI gold: 100 m freestyle | |
| Paulina Guba | ATH | Olympics | 2016—2020 | 0–1–1 2015 Gwangju ATH silver: shot put; 2017 Taipei ATH bronze: shot put | |
| Andrius Gudžius | ATH | Olympics | 2016—2024 | 0–0–1 2015 Gwangju ATH bronze: discus throw | |
| Marieke Guehrer | SWM | Olympics | 2004 | 1–1–0 2011 Shenzhen SWI gold: 4×100 m freestyle relay, silver: 50 m butterfly | |
| Vincenzo Guerini | ATH | Olympics | 1972—1976 | 0–0–1 1973 Moskva ATH bronze: 4×100 m relay | |
| Stéphane Guerinot | ROW | Olympics | 1996 | 0–1–0 1993 Buffalo ROW silver: coxed fours | |
| José Antonio Guerra | DIV | Olympics | 2000—2012 | 1–1–1 1999 Palma de Mallorca DIV gold: platform; 2001 Beijing DIV silver: platform, bronze: synchronized platform | |
| Giancarlo Guerrini | WPO | Olympics | 1960—1968 | 1–0–0 1959 Torino SWI gold: 4×200 m freestyle relay | |
| Abdelati El-Guesse | ATH | Olympics | 2016—2024 | 0–1–0 2015 Gwangju ATH silver: 800 m | |
| Edgardo Guilbe | ATH | Olympics | 1988—1992 | 0–0–1 1987 Zagreb ATH bronze: 200 m | |
| Yekta Yılmaz Gül | WRE | Olympics | 2004 | 0–1–0 2005 İzmir WRE silver: Greco-Roman super-heavyweight -120 kg | |
| Mária Gulácsy | FEN | Olympics | 1968 | 1–1–0 1963 Porto Alegre FEN silver: foil team; 1965 Budapest FEN gold: foil team | |
| Sibel Güler | TKW | Olympics | 2008 | 1–1–0 2005 İzmir TKW gold: welterweight -67 kg; 2007 Bangkok TKW silver: welterweight -67 kg | |
| Ramil Guliyev | ATH | Olympics | 2008—2020 | 1–0–2 2009 Beograd ATH gold: 200 m (competed as Ramil Quliyev for Azerbaijan); 2015 Gwangju ATH bronze: 100 m and 200 m (competed for Turkey) | |
| József Gulrich | SWM | Olympics | 1964 | 1–1–0 1963 Porto Alegre SWI gold: 4×100 m medley relay, silver: 4×100 m freestyle relay | |
| Ákos Gulyás | SWM | Olympics | 1964 | 0–0–2 1965 Budapest SWI bronze: 4×100 m freestyle relay and 4×100 m medley relay | |
| Anja Gündler | ATH | Olympics | 1996 | 0–1–1 1993 Buffalo ATH bronze: discus throw; 1995 Fukuoka ATH silver: discus throw | |
| Guo Dan | ARC | Olympics | 2008 | 0–0–1 2009 Beograd ARC bronze: recurve team | |
| Guo Jingjing | DIV | Olympics | 1996—2008 | 8–2–0 2001 Beijing DIV gold: 1 m springboard, 3 m springboard, synchronized platform, and team; 2003 Daegu DIV gold: synchronized springboard and team, silver: 1 m springboard and 3 m springboard; 2005 İzmir DIV gold: 3 m springboard and synchronized springboard | |
| Guo Shiqiang | BKB | Olympics | 2000—2004 | 0–1–0 2001 Beijing BAS silver | |
| Guo Shuang | CTR | Olympics | 2008—2012 | 1–0–0 2011 Shenzhen CYC gold: sprint | |
| Guo Weiyang | GAR | Olympics | 2012 | 1–3–0 2007 Bangkok GYM gold: parallel bars, silver: all-around, horizontal bar, and team | |
| Lyudmila Gureyeva | VVO | Olympics | 1964 | 2–0–0 1961 Sofia VOL gold; 1965 Budapest VOL gold | |
| Viktoriya Gurova-Valyukevich | ATH | Olympics | 2004—2012 | 0–1–0 2003 Daegu ATH silver: triple jump (competed as Viktoriya Gurova) | |
| Ilona Gusenbauer | ATH | Olympics | 1968—1972 | 0–0–1 1970 Torino ATH bronze: high jump | |
| Stephan Güsgen | SWM | Olympics | 1988 | 0–0–4 1985 Kobe SWI bronze: 4×100 m medley relay (swam in heats only); 1987 Zagreb SWI bronze: 50 m freestyle, 4×100 m freestyle relay, and 4×100 m medley relay | |
| Eduard Gushchin | ATH | Olympics | 1968 | 0–0–1 1965 Budapest ATH bronze: shot put | |
| Rebeca Gusmão | SWM | Olympics | 2004 | 0–0–1 2007 Bangkok SWI bronze: 50 m freestyle | |
| Linda Gustavson | SWM | Olympics | 1968 | 4–0–0 1967 Tokyo SWI gold: 100 m freestyle, 400 m freestyle, 4×100 m freestyle relay, and 4×100 m medley relay | |
| Diana Gustilina | BKB | Olympics | 2004 | 0–0–1 1999 Palma de Mallorca BAS bronze | |
| Siegmar Gutzeit | FEN | Olympics | 1980 | 0–0–1 1979 Ciudad de México FEN bronze: foil team | |
| Tuğba Güvenç | ATH | Olympics | 2016 | 1–0–0 2017 Taipei ATH gold: 3000 m steeplechase | |
| Elisabeta Guzganu-Tufan | FEN | Olympics | 1984—1992 | 2–1–0 1981 București FEN gold: foil team (competed as Elisabeta Guzganu); 1983 Edmonton FEN gold: foil, silver: foil team (competed as Elisabeta Guzganu) | |
| Lucas Guzmán | TKW | Olympics / YOG | 2010—2024 | 0–1–0 2017 Taipei TKW silver: bantamweight -63 kg | |
| Małgorzata Guzowska | ATH | Olympics | 1980 | 2–0–0 1981 București ATH gold: heptathlon; 1985 Kobe ATH gold: heptathlon | |
| Gwak Dong-Han | JUD | Olympics | 2016—2020 | 3–2–0 2013 Kazan JUD gold: middleweight -90 kg, silver: team; 2015 Gwangju JUD gold: middleweight -90 kg, silver: team; 2017 Taipei JUD gold: middleweight -90 kg | |
| Gwak Hyeon-Chae | BKB | Olympics | 1968 | 0–1–0 1967 Tokyo BAS silver | |
| Gwon Gyeong-Min | DIV | Olympics | 1996—2000 | 0–0–2 2003 Daegu DIV bronze: synchronized platform and team | |
| Gwon Han-Na | HBL | Olympics | 2012—2016 | 0–1–0 2015 Gwangju HAN silver | |
| Gwon Yeong-U | JUD | Olympics | 2004 | 3–0–0 2001 Beijing JUD gold: half-middleweight -81 kg; 2003 Daegu JUD gold: half-middleweight -81 kg and team | |
| Anett Györe | WPO | Olympics | 2004—2008 | 0–1–0 2009 Beograd WAP silver | |
| Dóra Győrffy | ATH | Olympics | 2000 | 1–0–0 2003 Daegu ATH gold: high jump | |
| Ileana Gyulai-Drîmbă-Jenei | FEN | Olympics | 1964—1976 | 1–1–0 1965 Budapest FEN silver: foil team (competed as Ileana Gyulai); 1973 Moskva FEN gold: foil team (competed as Ileana Gyulai) | |
| István Gyulai | ATH | Olympics | 1964 | 1–1–0 1963 Porto Alegre ATH gold: 4×100 m relay; 1965 Budapest ATH silver: 4×400 m relay | |
| József Gyuricza | FEN | Olympics | 1956—1964 | 3–1–0 1961 Sofia FEN gold: foil team and sabre team; 1963 Porto Alegre FEN gold: sabre team, silver: foil team | |
| Gergely Gyurta | SWM | Olympics | 2012—2020 | 0–0–1 2017 Taipei SWI bronze: 1500 m freestyle | |
| Ha Chang-Deok | FEN | Olympics | 2004 | 0–2–0 2003 Daegu FEN silver: foil and foil team | |
| Ha Hyeong-Ju | JUD | Olympics / Opening Flagbearer | 1984—1988 | 1–0–0 1985 Kobe JUD gold: half-heavyweight -95 kg | |
| Ha Ui-Geon | BKB | Olympics | 1964—1968 | 0–1–0 1967 Tokyo BAS silver | |
| Bruno Habārovs | FEN | Olympics | 1960—1964 | 0–2–0 1965 Budapest FEN silver: épée and épée team | |
| Milan Haborák | ATH | Olympics | 2000—2008 | 0–0–1 2001 Beijing ATH bronze: shot put | |
| Dan Hackett | WPO | Olympics | 1996—2000 | 1–0–0 1993 Buffalo WAP gold | |
| Dana Hadačová | TTE | Olympics | 2008—2012 | 0–0–1 2011 Shenzhen TTN bronze: doubles | |
| Jayden Hadler | SWM | Olympics | 2012 | 0–1–1 2013 Kazan SWI silver: 4×100 m freestyle relay, bronze: 4×200 m freestyle relay (swam in heats only) | |
| Volker Hadwich | ATH | Olympics | 1992 | 0–0–1 1987 Zagreb ATH bronze: javelin throw (competed for East Germany) |