Host cities:
| Athlete | Nation(s) | Sport(s) | Role(s) | Era | Notes |
|---|---|---|---|---|---|
| Hu Jia | DIV | Olympics | 2000—2004 | 5–1–0 2001 Beijing DIV gold: synchronized platform and team; 2003 Daegu DIV gold: team, silver: platform; 2007 Bangkok DIV gold: platform and team | |
| Hu Kai | ATH | Olympics | 2008 | 1–0–0 2005 İzmir ATH gold: 100 m | |
| Hu Weidong | BKB | Olympics | 1992—2000 | 0–0–1 1993 Buffalo BAS bronze | |
| Hu Xiaotao | BKB | Olympics | 2004 | 0–1–0 2001 Beijing BAS silver | |
| Hu Yadong | ROW | Olympics | 1988 | 0–0–1 1989 Duisburg ROW bronze: coxless fours | |
| Huang Haiyang | FEN | Olympics | 2008 | 1–0–0 2003 Daegu FEN gold: sabre team | |
| Huang Huadong | GAR | Olympics | 1996 | 1–0–1 1991 Sheffield GYM gold: pommelled horse, bronze: team | |
| Huang Liang-Chi | TEN | YOG | 2010 | 0–2–1 2011 Shenzhen TEN bronze: team; 2013 Kazan TEN silver: team; 2015 Gwangju TEN silver: team | |
| Huang Qun | GAR | Olympics | 1984 | 0–0–1 1987 Zagreb GYM bronze: team | |
| Huang Shih-Feng | ATH | Olympics | 2016—2020 | 0–1–1 2015 Gwangju ATH silver: javelin throw; 2017 Taipei ATH bronze: javelin throw | |
| Huang Xiaoxiao | ATH | Olympics | 2004—2012 | 0–1–0 2003 Daegu ATH silver: 400 m hurdles | |
| Huang Yi-Hua | TTE | Olympics | 2004—2016 | 1–0–4 2007 Bangkok TTN bronze: doubles; 2009 Belgrade TTN gold: mixed doubles, bronze: singles; 2011 Shenzhen TTN bronze: mixed doubles and team | |
| Huang Yu-Jen | TKW | Olympics / YOG | 2014—2020 | 0–1–0 2017 Taipei TKW silver: Kyorugi team | |
| Huang Zhihong | ATH | Olympics / Non-starter | 1988—1996 | 1–0–0 1989 Duisburg ATH gold: shot put | |
| Debbie Huband | BKB | Olympics | 1984 | 0–0–1 1979 Ciudad de México BAS bronze | |
| Phil Hubbard | BKB | Olympics | 1976 | 1–0–0 1977 Sofia BAS gold | |
| Phil Hubble | SWM | Olympics | 1980—1984 | 0–1–0 1983 Edmonton SWI silver: 200 m butterfly | |
| Sophie Huber | SWM | Olympics | 2008 | 0–0–1 2005 İzmir SWI bronze: 4×200 m freestyle relay | |
| Liudmila Hubkina | ATH | Olympics | 2000 | 0–1–1 1999 Palma de Mallorca ATH silver: hammer throw; 2001 Beijing ATH bronze: hammer throw | |
| Claire Huddart | SWM | Olympics | 1996—2000 | 0–1–1 1993 Buffalo SWI silver: 4×200 m freestyle relay, bronze: 200 m freestyle | |
| Valeriya Hudym | GRY | Olympics | 2012—2016 | 2–3–3 2013 Kazan RGY silver: group all-around, bronze: group 10 clubs and group 3 balls + 2 ribbons; 2015 Gwangju RGY gold: group 6 clubs + 2 hoops, silver: group all-around and group 5 ribbons; 2017 Taipei RGY gold: group all-around, bronze: group 3 balls + 2 ropes | |
| Tanya Hughes | ATH | Olympics | 1992 | 1–0–0 1993 Buffalo ATH gold: high jump | |
| Zdeněk Humhal | VVO | Olympics | 1964 | 1–0–0 1959 Torino VOL gold | |
| Hung Tzu-Hsiang | TTE | YOG | 2010 | 0–0–1 2013 Kazan TTN bronze: team | |
| Bryce Hunt | SWM | Olympics | 2004 | 1–0–0 2001 Beijing SWI gold: 200 m backstroke | |
| Andrew Hunter | SWM | Olympics | 2008 | 0–1–0 2007 Bangkok SWI silver: 200 m freestyle | |
| Sophia Hunter | ATH | Olympics | 1984 | 0–0–1 1987 Zagreb ATH bronze: 400 m hurdles (competed for the United States) | |
| Huo Liang | DIV | Olympics | 2008 | 6–0–0 2011 Shenzhen DIV gold: synchronized platform and team; 2013 Kazan DIV gold: platform, synchronized platform, and team; 2015 Gwangju DIV gold: team | |
| Courtney Hurley | FEN | Olympics | 2012—2020 | 0–1–0 2011 Shenzhen FEN silver: épée team | |
| Kelley Hurley | FEN | Olympics | 2008—2020 | 0–1–0 2011 Shenzhen FEN silver: épée team | |
| Vadym Huttsait | FEN | Olympics / Referee / Other | 1992—2022 | 2–1–2 1991 Sheffield FEN bronze: sabre team (competed for the Soviet Union); 1995 Fukuoka FEN silver: sabre (competed for Ukraine); 1997 Catania FEN gold: sabre, bronze: sabre team (competed for Ukraine); 1999 Palma de Mallorca FEN gold: sabre (competed for Ukraine) | |
| Carol Huynh | WRE | Olympics | 2008—2012 | 1–0–0 2005 İzmir WRE gold: freestyle flyweight -48 kg | |
| Oleksandr Hvozdyk | BOX | Olympics | 2012 | 1–0–0 2013 Kazan BOX gold: Light Heavyweight -81 kg | |
| Hwang Gyeong-Seon | TKW | Olympics | 2004—2012 | 0–1–0 2005 İzmir TKW silver: welterweight -67 kg | |
| Hwang Hui-Tae | JUD | Olympics | 2004—2012 | 0–0–1 2001 Beijing JUD bronze: middleweight -90 kg | |
| Hwang Seon-A | FEN | Olympics | 2016 | 0–1–0 2017 Taipei FEN silver: sabre | |
| Hwang Ye-Seul | JUD | Olympics | 2012 | 2–1–1 2009 Beograd JUD silver: team, bronze: middleweight -70 kg; 2013 Kazan JUD gold: middleweight -70 kg and team | |
| Hwang Yeong-Jo | ATH | Olympics | 1992 | 1–0–0 1991 Sheffield ATH gold: marathon | |
| Hyeon Suk-Hui | JUD | Olympics / Referee | 1996—2020 | 1–1–0 1995 Fukuoka JUD gold: team, silver: half-lightweight -52 kg | |
| Hyon Il-Myong | DIV | YOG | 2010 | 1–1–0 2017 Taipei DIV gold: synchronized platform (mixed), silver: synchronized platform | |
| Monica Iagăr-Dinescu | ATH | Olympics | 2000—2004 | 1–1–0 1997 Catania ATH silver: high jump (competed as Monica Iagar); 1999 Palma de Mallorca ATH gold: high jump (competed as Monica Iagar) | |
| Elena Iagăr | ATH | Olympics | 2000—2004 | 1–0–1 1999 Palma de Mallorca ATH gold: 1500 m, bronze: 800 m (competed as Elena Buhaianu) | |
| Anvar Ibragimov | FEN | Olympics | 1988—1992 | 0–1–1 1985 Kobe FEN bronze: foil (competed for the Soviet Union); 1991 Sheffield FEN silver: foil team (competed for the Soviet Union) | |
| Hayle İbrahimov | ATH | Olympics | 2012—2016 | 2–0–0 2013 Kazan ATH gold: 5000 m; 2015 Gwangju ATH gold: 5000 m | |
| Kaori Icho | WRE | Olympics | 2004—2016 | 1–0–0 2005 İzmir WRE gold: freestyle middleweight -63 kg | |
| Alexandre Iddir | JUD | Olympics | 2016—2020 | 0–1–0 2011 Shenzhen JUD silver: team | |
| Faith Idehen | ATH | Olympics | 1992 | 0–1–0 1993 Buffalo ATH silver: 4×100 m relay | |
| Chihiro Igarashi | SWM | Olympics | 2016—2020 | 1–0–1 2017 Taipei SWI gold: 4×100 m medley relay, bronze: 4×200 m freestyle relay | |
| Leire Iglesias | JUD | Olympics | 2008 | 0–0–2 1999 Palma de Mallorca JUD bronze: middleweight -70 kg; 2003 Daegu JUD bronze: middleweight -70 kg | |
| Thatiana Ignácio | ATH | Non-starter | 2004 | 0–0–1 2003 Daegu ATH bronze: 4×100 m relay | |
| Nataliya Ignatova | ATH | Olympics | 2000 | 0–1–0 1997 Catania ATH silver: 4×100 m relay | |
| Lyudmila Ignatyeva-Samotyosova | ATH | Olympics | 1960—1968 | 1–0–0 1965 Budapest ATH gold: 4×100 m relay (competed as Lyudmila Samotyosova) | |
| Aliaksei Ihnatovich | GAR | Olympics | 2008 | 1–1–0 2003 Daegu GYM gold: pommelled horse; 2005 İzmir GYM silver: pommelled horse | |
| Takako Iida | VVO | Olympics | 1972—1976 | 1–1–0 1967 Tokyo VOL gold; 1970 Turin VOL silver | |
| Hideo Iijima | ATH | Olympics | 1964—1968 | 1–0–0 1965 Budapest ATH gold: 100 m | |
| Shota Iizuka | ATH | Olympics | 2012—2024 | 0–1–1 2013 Kazan ATH silver: 4×100 m relay, bronze: 200 m | |
| Laura Ikauniece-Admidiņa | ATH | Olympics | 2012—2016 | 1–0–0 2013 Kazan ATH gold: heptathlon (competed as Laura Ikauniece) | |
| Kumiko Ikeda | ATH | Olympics | 2008 | 0–0–1 2001 Beijing ATH bronze: long jump | |
| Yuta Ikeda | GLF | Olympics | 2016 | 0–0–1 2007 Bangkok GOL bronze: team | |
| Kanae Ikehata | FEN | Olympics | 2012 | 0–0–1 2005 İzmir FEN bronze: foil | |
| Daisuke Ikeshima | ATH | Olympics | 1996—2000 | 0–0–1 1999 Palma de Mallorca ATH bronze: 20 km | |
| Ayodélé Ikuesan | ATH | Olympics / Non-starter | 2008—2012 | 0–0–1 2009 Beograd ATH bronze: 4×100 m relay | |
| Marieta Ilcu | ATH | Olympics | 1992 | 1–1–1 1985 Kobe ATH bronze: long jump; 1987 Zagreb ATH gold: long jump; 1989 Duisburg ATH silver: long jump | |
| Viorica Ilica | ROW | Olympics | 1988 | 1–0–0 1989 Duisburg ROW gold: coxless fours | |
| Anna Iljuštšenko | ATH | Olympics | 2008—2012 | 0–0–2 2011 Shenzhen ATH bronze: high jump; 2013 Kazan ATH bronze: high jump | |
| Karin Illgen | ATH | Olympics | 1968 | 1–0–0 1970 Torino ATH gold: discus throw | |
| Gary Ilman | SWM | Olympics | 1964 | 2–0–1 1965 Budapest SWI gold: 4×100 m freestyle relay and 4×200 m freestyle relay, bronze: 100 m freestyle | |
| Yavuz İlnam | SHO | Olympics | 2016 | 1–0–1 2015 Gwangju SHO gold: trap team, bronze: trap | |
| Leonid Ilyichov | SWM | Olympics | 1968 | 0–3–1 1970 Torino SWI silver: 4×100 m freestyle relay, 4×200 m freestyle relay, and 4×100 m medley relay, bronze: 100 m freestyle | |
| Im Dong-Hyeon | ARC | Olympics | 2004—2012 | 1–1–0 2005 İzmir ARC silver: recurve team; 2011 Shenzhen ARC gold: recurve | |
| Im Su-Jeong | TKW | Olympics | 2008 | 1–0–0 2007 Bangkok TKW gold: featherweight -59 kg | |
| Runa Imai | SWM | Olympics | 2016 | 0–2–1 2019 Napoli SWI silver: 4×100 m freestyle relay and 4×100 m medley relay, bronze: 200 m medley | |
| Genki Imamura | SWM | Olympics | 2004 | 0–0–1 2005 İzmir SWI bronze: 200 m breaststroke | |
| Chidi Imoh | ATH | Olympics | 1984—1992 | 2–0–0 1983 Edmonton ATH gold: 100 m; 1985 Kobe ATH gold: 100 m | |
| Yakhyo Imomov | JUD | Olympics | 2012 | 0–1–0 2013 Kazan JUD silver: half-middleweight -81 kg | |
| Naoko Imoto | SWM | Olympics | 1996 | 1–2–2 1995 Fukuoka SWI silver: 4×200 m freestyle relay and 4×100 m medley relay, bronze: 200 m freestyle and 4×100 m freestyle relay; 1999 Palma de Mallorca SWI gold: 4×100 m medley relay | |
| Géza Imre | FEN | Olympics | 1996—2016 | 1–1–0 1995 Fukuoka FEN gold: épée team; 1997 Catania FEN silver: épée team | |
| Noriko Inada | SWM | Olympics | 1992—2004 | 4–1–0 1997 Catania SWI gold: 100 m backstroke and 4×100 m medley relay, silver: 200 m backstroke; 1999 Palma de Mallorca gold: 100 m backstroke and 4×100 m medley relay | |
| Saori Inagaki | GRY | Olympics | 2008 | 0–0–3 2011 Shenzhen RGY bronze: group all-around, group 5 balls, and group 3 ribbons + 2 hoops | |
| Anna Incerti | ATH | Olympics | 2008—2016 | 0–0–1 2003 Daegu ATH bronze: 10000 m | |
| Melissa Ingram | SWM | Olympics | 2008—2012 | 0–3–0 2005 İzmir SWI silver: 4×200 m freestyle relay; 2007 Bangkok SWI silver: 200 m breaststroke; 2011 Shenzhen SWI silver: 4×200 m freestyle relay | |
| Fabio Innocenti | VVO | Olympics | 1980 | 1–0–0 1970 Torino VOL gold | |
| Mateus Inocêncio | ATH/BOB | Olympics | 2002—2004 | 1–0–0 2005 İzmir ATH gold: 110 m hurdles | |
| Satoru Inoue | ATH | Olympics | 1992—1996 | 0–1–0 1993 Buffalo ATH silver: 4×100 m relay | |
| Setsuko Inoue | VVO | Olympics | 1968 | 1–0–0 1967 Tokyo VOL gold | |
| Yuzuru Inoue | VVO | Olympics | 1988 | 1–0–0 1985 Kobe VOL gold | |
| Yukiko Inui | SWA | Olympics | 2012—2020 | 0–3–0 2013 Kazan SYN silver: solo, duet, and team Free Routine Combination | |
| Alison Inverarity | ATH | Olympics | 1992—2000 | 1–0–0 1991 Sheffield ATH gold: high jump | |
| Șerban Ioan | ATH | Olympics | 1972 | 0–0–1 1970 Torino ATH bronze: high jump | |
| Kyriakos Ioannou | ATH | Olympics | 2004—2016 | 0–1–0 2007 Bangkok ATH silver: high jump | |
| Valy Ionescu | ATH | Olympics | 1984 | 0–0–2 1981 București ATH bronze: long jump; 1983 Edmonton ATH bronze: long jump | |
| Larisa Iordache | GAR | Olympics | 2012—2020 | 2–0–1 2017 Taipei GYM gold: all-around and floor, bronze: balance beam | |
| Vasile Iorga | WRE | Olympics | 1972—1976 | 0–1–0 1973 Moskva WRE silver: freestyle middleweight -82 kg | |
| Gian Paolo Iraldo | ATH | Non-starter | 1964 | 1–0–0 1965 Budapest ATH gold: 4×400 m relay | |
| Eko Yuli Irawan | WLF | Olympics | 2008—2024 | 1–0–0 2011 Shenzhen WLT gold: featherweight -62 kg | |
| Ryosuke Irie | SWM | Olympics | 2008—2020 | 6–1–0 2009 Beograd SWI gold: 100 m backstroke, 200 m backstroke, and 4×100 m medley relay, silver: 50 m backstroke; 2011 Shenzhen SWI gold: 50 m backstroke, 200 m backstroke, and 4×100 m medley relay | |
| Dan Irimiciuc | FEN | Olympics | 1972—1976 | 1–0–2 1973 Moskva FEN bronze: sabre; 1977 Sofia FEN gold: sabre team, bronze: sabre | |
| Vladimir Isachenko | SHO | Olympics | 2004—2016 | 0–1–1 2007 Bangkok SHO silver: 25 m standard pistol team, bronze: 25 m rapid fire pistol team | |
| Yury Isakov | ATH | Olympics | 1976 | 0–1–0 1973 Moskva ATH silver: pole vault | |
| Sara Isakovič | SWM | Olympics | 2004—2012 | 1–1–1 2007 Bangkok SWI silver: 200 m freestyle, bronze: 200 m butterfly; 2009 Beograd SWI gold: 200 m freestyle | |
| Gulzhan Isanova | JUD | Olympics | 2008—2012 | 0–0–1 2009 Beograd JUD bronze: heavyweight +78 kg | |
| Bodin Isara | BDM | Olympics | 2012—2016 | 1–0–3 2011 Shenzhen BDM gold: doubles, bronze: team; 2015 Gwangju BDM bronze: doubles and team | |
| Joel Isasi | ATH | Olympics | 1992—1996 | 0–0–2 1989 Duisburg ATH bronze: 100 m; 1993 Buffalo ATH bronze: 4×100 m relay | |
| Mansur Isayev | JUD | Olympics | 2012 | 0–0–1 2007 Bangkok JUD bronze: team | |
| Radik İsayev | TKW | Olympics | 2016 | 0–0–1 2017 Taipei TKW bronze: heavyweight +87 kg | |
| Vladimer Iselidze | WPO | Olympics | 1976 | 1–0–0 1973 Moskva WAP gold | |
| Yoshihisa Ishida | ATH | Olympics | 1968—1972 | 1–0–0 1967 Tokyo ATH gold: hammer throw | |
| Satoshi Ishii | JUD | Olympics | 2008 | 2–0–0 2007 Bangkok JUD gold: open class and team | |
| Yusuke Ishijima | VBV/VVO | Olympics | 2008—2020 | 0–1–0 2005 İzmir VOL silver | |
| Junji Ishikawa | ATH | Non-starter | 1964 | 0–1–0 1967 Tokyo ATH silver: 4×100 m relay | |
| Kenji Ishikawa | SWM | Olympics | 1964 | 0–2–1 1967 Tokyo SWI silver: 100 m breaststroke and 4×100 m medley relay, bronze: 200 m breaststroke | |
| Shinnosuke Ishikawa | SWM | YOG | 2018 | 1–0–0 2019 Napoli SWI gold: 100 m butterfly | |
| Sachie Ishizu | TEN | YOG | 2010 | 2–1–0 2011 Shenzhen TEN silver: team; 2013 Kazan TEN gold: singles and team | |
| Daniel Islas | DIV | Olympics | 2012 | 0–0–3 2013 Kazan DIV bronze: synchronized springboard and team; 2015 Gwangju DIV bronze: 3 m springboard | |
| Idulio Islas | TKW | Olympics | 2008 | 0–0–1 2011 Shenzhen TKW bronze: featherweight -68 kg | |
| Märt Israel | ATH | Olympics | 2008—2012 | 1–0–1 2007 Bangkok ATH bronze: discus throw; 2011 Shenzhen ATH gold: discus throw | |
| Ítalo Manzine | SWM | Olympics | 2016 | 0–1–0 2017 Taipei SWI silver: 50 m freestyle | |
| Pat Itanyi | ATH | Olympics | 2000 | 0–0–1 1995 Fukuoka ATH bronze: 4×100 m relay | |
| Katsuji Ito | SWM | Olympics | 1968 | 0–0–1 1967 Tokyo SWI bronze: 1500 m freestyle | |
| Shunsuke Ito | SWM | Olympics | 1996 | 0–0–1 1995 Fukuoka SWI bronze: 4×200 m freestyle relay | |
| Hajime Itoi | SWM | Olympics | 1992—1996 | 0–2–0 1995 Fukuoka SWI silver: 100 m backstroke and 4×100 m medley relay | |
| Yoichi Itokazu | WLF | Olympics | 2016—2020 | 0–1–0 2013 Kazan WLT silver: featherweight -62 kg | |
| Mayo Itoyama | SWA | Olympics | 2012 | 0–2–0 2013 Kazan SYN silver: team and team Free Routine Combination | |
| Edgar Itt | ATH | Olympics | 1988 | 0–0–1 1989 Duisburg ATH bronze: 4×400 m relay | |
| Amalie Iuel | ATH | Olympics | 2016—2024 | 0–0–1 2019 Napoli ATH bronze: 400 m hurdles | |
| Paula Ivan | ATH | Olympics | 1988 | 4–0–0 1987 Zagreb ATH gold: 1500 m and 3000 m; 1989 Duisburg ATH gold: 1500 m and 3000 m | |
| Irene Ivancan | TTE | Olympics | 2012 | 0–0–1 2007 Bangkok TTN bronze: doubles | |
| Ivan Ivankou | GAR | Olympics | 2000—2004 | 1–0–0 1999 Palma de Mallorca GYM gold: rings | |
| Aleksandr Ivanov | WLF | Olympics | 2012 | 1–0–0 2013 Kazan WLT gold: middle-heavyweight -94 kg | |
| Dragán Ivanov | ATH | Olympics | 1968 | 0–1–0 1965 Budapest ATH silver: triple jump | |
| Ion Ivanov | WRE | Olympics | 1980 | 0–0–1 1977 Sofia WRE bronze: freestyle light-heavyweight -90 kg | |
| Leonid Ivanov | ATH | Olympics | 1964 | 1–0–0 1963 Porto Alegre ATH gold: 5000 m | |
| Martin Ivanov | JUD | Olympics | 2012 | 0–0–2 2009 Beograd JUD bronze: half-lightweight -66 kg; 2013 Kazan Sambo bronze: -68 kg | |
| Mikhail Ivanov | WPO | Olympics | 1980—1988 | 1–0–0 1985 Kobe WAP gold | |
| Tihomir Ivanov | ATH | Olympics | 2016—2024 | 1–0–0 2019 Napoli ATH gold: high jump | |
| Vladimir Ivanov | BDM | Olympics | 2012—2020 | 0–1–1 2013 Kazan BDM silver: doubles, bronze: mixed doubles | |
| Yuriy Ivanov | ROW | YOG | 2010 | 0–1–0 2015 Gwangju ROW silver: eights | |
| Anastasiya Ivanova-Shvedava | ATH | Olympics | 2004—2012 | 0–1–0 2003 Daegu ATH silver: pole vault (competed as Anastasiya Ivanova for Russia) | |
| Nataliya Ivanova | ATH | Olympics | 2004 | 2–0–0 2005 İzmir ATH gold: 200 m and 4×400 m relay | |
| Olga Ivanova | TKW | YOG | 2010 | 0–0–1 2011 Shenzhen TKW bronze: heavyweight +73 kg | |
| Yevgeniya Ivanova | WPO | Olympics | 2012—2020 | 1–0–0 2013 Kazan WAP gold | |
| Roman Ivanovsky | SWM | Olympics | 1996 | 0–1–0 2003 Daegu SWI silver: 4×100 m medley relay | |
| Morten Ivarsen | CSP | Olympics | 1988—1996 | 1–0–0 1987 Zagreb CAN gold: K1 1000 m | |
| Yelena Ivashchenko | JUD | Olympics | 2012 | 0–0–1 2003 Daegu JUD bronze: heavyweight +78 kg (competed as Yelena Shleyzye) | |
| Allen Iverson | BKB | Olympics | 2004 | 1–0–0 1995 Fukuoka BAS gold | |
| Mitch Ivey | SWM | Olympics | 1968—1972 | 3–0–0 1970 Torino SWI gold: 100 m backstroke, 200 m backstroke, and 4×100 m medley relay | |
| Nataliya Ivoninskaya | ATH | Olympics | 2008—2012 | 0–1–0 2011 Shenzhen ATH silver: 100 m hurdles | |
| Aleksandar Ivović | WPO | Olympics | 2008—2020 | 2–0–0 2005 İzmir WAP gold; 2007 Bangkok WAP gold | |
| Kazuyuki Iwamoto | SWM | Olympics | 1964 | 0–0–1 1965 Budapest SWI bronze: 4×200 m freestyle relay | |
| Kunihiro Iwasaki | SWM | Olympics | 1964—1968 | 0–1–3 1965 Budapest SWI bronze: 4×200 m freestyle relay; 1967 Tokyo SWI silver: 4×100 m medley relay, bronze: 4×100 m freestyle relay and 4×200 m freestyle relay | |
| Minoru Iwata | VVO | Olympics | 1984 | 1–0–0 1985 Kobe VOL gold | |
| Dan Izotov | SWM | Olympics | 2008—2016 | 3–0–0 2013 Kazan SWI gold: 200 m freestyle, 4×100 m freestyle relay, and 4×200 m freestyle relay | |
| Hiroshi Izumi | JUD | Olympics | 2004—2008 | 1–1–0 2003 Daegu JUD gold: middleweight -90 kg, silver: team | |
| Masayuki Izumikawa | VVO | Olympics | 1992 | 1–0–0 1993 Buffalo VOL gold | |
| Piotr Jabłkowski | FEN | Olympics | 1980 | 0–1–0 1983 Edmonton FEN silver: épée team | |
| Leszek Jabłonowski | FEN | Olympics | 1976—1980 | 0–0–2 1973 Moskva FEN bronze: sabre team; 1979 Ciudad de México FEN bronze: sabre team | |
| Andrew Jachno | ATH | Olympics | 1984—1992 | 0–0–1 1989 Duisburg ATH bronze: 20 km walk | |
| Grace Jackson-Small | ATH | Olympics | 1984—1992 | 1–0–2 1983 Edmonton ATH bronze: 200 m (competed as Grace Jackson); 1985 Kobe ATH gold: 200 m relay, bronze: 100 m (competed as Grace Jackson) | |
| John Jackson | ATH | Olympics | 1968 | 0–1–1 1967 Tokyo ATH silver: 3000 m steeplechase, bronze: 5000 m | |
| Doris Jacob | ATH | Olympics | 2000 | 0–0–1 1999 Palma de Mallorca ATH bronze: 400 m | |
| Lisa Jacob | SWM | Olympics | 1996 | 2–0–0 1995 Fukuoka SWI gold: 200 m freestyle and 4×200 m freestyle relay | |
| Peter Jacobs | FEN | Olympics | 1964—1968 | 1–0–0 1963 Porto Alegre FEN gold: épée | |
| Josetta Jacques-André-Coquin | FEN | Olympics | 2016 | 2–0–0 2013 Kazan FEN gold: épée team; 2015 Gwangju FEN gold: épée team | |
| Catherine Jacques | JUD | Olympics | 2004—2008 | 0–1–0 2001 Beijing JUD silver: middleweight -70 kg | |
| Anna Jagaciak | ATH | Olympics | 2016 | 0–2–1 2013 Kazan ATH silver: triple jump; 2015 Gwangju ATH silver: long jump, bronze: triple jump | |
| Maja Jager | ARC | Olympics | 2012—2020 | 0–0–1 2015 Gwangju ARC bronze: recurve | |
| Tom Jager | SWM | Olympics | 1984—1992 | 0–3–1 1983 Edmonton SWI silver: 100 m freestyle, 100 m butterfly, and 4×100 m freestyle relay, bronze: 4×100 m medley relay | |
| Libuše Jahodová | SHO | Olympics | 2016 | 2–0–0 2015 Gwangju SHO gold: skeet and skeet team | |
| Sharon Jaklofsky | ATH | Olympics | 1996 | 0–1–0 1995 Fukuoka ATH silver: long jump | |
| Nikola Jakšić | WPO | Olympics | 2016—2024 | 1–0–0 2017 Taipei WAP gold | |
| Sangwan Jaksunin | ATH | Olympics | 2008 | 0–1–0 2007 Bangkok ATH silver: 4×100 m relay | |
| Tomasz Jakubiak | SAL | Olympics | 2000—2004 | 1–0–0 1999 Palma de Mallorca SAI gold: 470 men | |
| Mahlagha Jambozorg | SHO | Olympics | 2012—2016 | 1–1–2 2015 Gwangju SHO gold: 50 m rifle prone, silver: 50 m rifle three positions team, bronze: 10 m air rifle team and 50 m rifle prone team | |
| Justin James | SWM | YOG | 2010 | 2–2–1 2013 Kazan SWI gold: 200 m medley, silver: 4×100 m freestyle relay, bronze: 4×200 m freestyle relay; 2015 Gwangju SWI gold: 200 m medley, silver: 4×200 m freestyle relay | |
| Larry James | ATH | Olympics | 1968 | 2–0–0 1970 Torino ATH gold: 400 m hurdles and 4×400 m relay | |
| Andy Jameson | SWM | Olympics | 1984—1988 | 2–0–0 1987 Zagreb SWI gold: 100 m freestyle and 100 m butterfly | |
| Jane Jamieson | ATH | Olympics | 1996—2000 | 2–1–0 1995 Fukuoka ATH gold: heptathlon; 2001 Beijing ATH gold: heptathlon; 2003 Daegu ATH silver: heptathlon | |
| Jamsrangiin Mönkh-Ochir | WRE | Olympics | 1972—1976 | 0–0–1 1973 Moskva WRE bronze: freestyle flyweight -52 kg | |
| Jamtsyn Davaajav | WRE | Olympics | 1976—1980 | 0–0–1 1977 Sofia WRE bronze: freestyle welterweight -74 kg | |
| Hanns Jana | FEN | Olympics | 1976 | 0–0–1 1979 Ciudad de México FEN bronze: épée | |
| Štěpán Janáček | ATH | Olympics | 2000—2008 | 0–2–0 1999 Palma de Mallorca ATH silver: pole vault; 2001 Beijing ATH silver: pole vault | |
| Jang Hye-Jin | ARC | Olympics | 2016 | 1–0–0 2009 Beograd ARC gold: recurve team | |
| Jang Jae-Geun | ATH | Olympics | 1984—1988 | 0–0–1 1985 Kobe ATH bronze: 200 m | |
| Jang Seon-Jae | CTR | Olympics | 2012 | 0–0–2 2011 Shenzhen CYC bronze: 4000 m individual pursuit and road time trial team | |
| Jang Seong-Ho | JUD | Olympics / Opening Flagbearer | 2000—2008 | 1–1–0 2001 Beijing JUD gold: open class, silver: half-heavyweight -100 kg | |
| Jang Ye-Na | BDM | Olympics | 2016 | 3–0–0 2011 Shenzhen BDM gold: doubles; 2013 Kazan BDM gold: doubles and team | |
| Igor Janik | ATH | Olympics | 2008—2012 | 1–1–1 2003 Daegu ATH gold: javelin throw; 2007 Bangkok ATH silver: javelin throw; 2011 Shenzhen ATH bronze: javelin throw | |
| Gabriele Janke | FEN | Olympics | 1980 | 1–0–0 1979 Ciudad de México FEN gold: foil team | |
| Karin Janke | ATH | Olympics | 1988 | 0–1–1 1989 Duisburg ATH silver: 4×400 m relay, bronze: 4×100 m relay | |
| Zoran Janković | WPO | Olympics | 1964—1972 | 1–0–0 1961 Sofia WAP gold | |
| Zsuzsa Jánosi-Németh | FEN | Olympics | 1988—1996 | 0–1–0 1989 Duisburg FEN silver: foil | |
| Ferenc Jánosi | VVO | Olympics | 1964 | 0–1–0 1965 Budapest VOL silver | |
| Milan Janša | ROW | Olympics | 1988—2000 | 0–0–1 1987 Zagreb ROW bronze: eights (competed for Yugoslavia) | |
| Zaiga Jansone | TEN | Non-Medal | 1968 | 1–0–0 1973 Moskva TEN gold: doubles | |
| Vytautas Janušaitis | SWM | Olympics | 2004—2012 | 0–1–0 2005 İzmir SWI silver: 200 m medley | |
| Paweł Januszewski | ATH | Olympics | 1996—2000 | 1–0–0 1999 Palma de Mallorca ATH gold: 400 m hurdles | |
| Zbigniew Januszkiewicz | SWM | Olympics | 1980 | 0–0–1 1981 București SWI bronze: 200 m backstroke | |
| Tero Järvenpää | ATH | Olympics | 2008 | 0–1–0 2005 İzmir ATH silver: javelin throw | |
| Tony Jarvis | SWM | Olympics | 1968 | 0–2–3 1967 Tokyo SWI silver: 4×100 m freestyle relay and 4×200 m freestyle relay, bronze: 400 m freestyle; 1970 Torino SWI bronze: 4×100 m freestyle relay and 4×200 m freestyle relay | |
| Stanisław Jaskułka | ATH | Olympics | 1980 | 0–0–1 1985 Kobe ATH bronze: long jump |