Host cities:
| Athlete | Nation(s) | Sport(s) | Role(s) | Era | Notes |
|---|---|---|---|---|---|
| Anoushirvan Nourian | BOX | Olympics / Non-starter | 1992—2004 | 0–0–1 1994 Hiroshima BOX bronze: welterweight -67 kg (competed for Iran) | |
| Anoushirvan Nourian | BOX | Olympics / Non-starter | 1992—2004 | 0–0–1 1994 Hiroshima BOX bronze: welterweight -67 kg (competed for Iran) | |
| Mubarak Sultan Al-Nubi Faraj | ATH | Olympics | 1996—2000 | 0–1–0 2002 Busan ATH silver: 400 m hurdles | |
| Abdul Rahman Al-Nubi | ATH | Olympics | 2000—2004 | 0–0–1 1998 Bangkok ATH bronze: long jump | |
| Kevin Nunis | HOC | Olympics | 1984 | 0–0–1 1982 New Delhi HOC bronze | |
| Kelbet Nurgazina | JUD | Olympics | 2008 | 0–0–1 2006 Doha JUD bronze: extra-lightweight -48 kg | |
| Kaysar Nurmaganbetov | CSP | Olympics | 1996—2008 | 2–2–1 1998 Bangkok CSP gold: C1 500 m, silver: C1 1000 m; 2002 Busan CSP silver: C1 1000 m, bronze: C1 500 m; 2006 Doha CSP gold: C2 500 m | |
| Guvanch Nurmuhammedov | JUD | Olympics / Opening Flagbearer | 2008 | 0–1–0 2002 Busan JUD silver: half-lightweight -66 kg | |
| Ruslan Nurudinov | WLF | Olympics | 2012—2016 | 1–0–0 2018 Jakarta/Palembang WLF gold: heavyweight -105 kg | |
| Bakhtiyer Nurullayev | WLF | Olympics | 1996—2000 | 0–0–2 1998 Bangkok WLF bronze: light-heavyweight -85 kg; 2002 Busan WLF bronze: light-heavyweight -85 kg | |
| Nyamaagiin Altankhuyag | BOX | Olympics | 1988—1992 | 0–0–1 1990 Beijing BOX bronze: light-welterweight -63.5 kg | |
| Nyamaagiin Altankhuyag | BOX | Olympics | 1988—1992 | 0–0–1 1990 Beijing BOX bronze: light-welterweight -63.5 kg | |
| Vyacheslav Nyu | WLF | Olympics | 2000 | 1–0–0 1994 Hiroshima WLF gold: light-heavyweight -83 kg | |
| O Gwang-Sun | ARC | Olympics | 1980 | 1–1–0 1982 New Delhi ARC gold: individual, silver: team | |
| Hitomi Obara | WRE | Olympics | 2012 | 0–0–1 2010 Guangzhou WRE bronze: freestyle flyweight -48 kg (competed as Hitomi Sakamoto) | |
| Saori Obata | TEN | Olympics | 2004 | 0–1–1 2002 Busan TEN silver: team, bronze: doubles | |
| Satsuki Obata | GAR | Olympics | 1996 | 0–1–0 1994 Hiroshima GAR silver: team | |
| Motoko Obayashi | VVO | Olympics | 1988—1996 | 0–0–2 1990 Beijing VVO bronze; 1994 Hiroshima VVO bronze | |
| Yumi Obe | FBL | Olympics / Non-starter | 1996—2004 | 0–0–2 1998 Bangkok FBL bronze; 2002 Busan FBL bronze | |
| Seiko Obonai | ATH | Olympics | 1964 | 2–2–0 1958 Tokyo ATH gold: shot put, silver: discus throw; 1962 Jakarta ATH gold: shot put, silver: discus throw | |
| Félix Ocampo | BOX | Olympics | 1964 | 0–0–1 1966 Bangkok BOX bronze: light-middleweight -71 kg | |
| Félix Ocampo | BOX | Olympics | 1964 | 0–0–1 1966 Bangkok BOX bronze: light-middleweight -71 kg | |
| Ochirbatyn Burmaa | WRE | Olympics | 2004—2020 | 0–0–2 2006 Doha WRE bronze: freestyle heavyweight -72 kg; 2014 Incheon WRE bronze: freestyle heavyweight -75 kg | |
| Ochirbatyn Nasanburmaa | WRE | Olympics | 2016 | 0–1–0 2010 Guangzhou WRE silver: freestyle middleweight -63 kg | |
| Ochirdolgoryn Enkhtaivan | WRE | Olympics | 1972 | 0–0–1 1974 Tehran WRE bronze: freestyle light-flyweight -48 kg | |
| Katsumi Oda | VVO | Olympics | 1976 | 1–1–0 1974 Tehran VVO gold: 1978 Bangkok VVO silver | |
| Yukio Odagiri | BOX | Olympics | 1976 | 0–0–1 1978 Bangkok BOX bronze: lightweight -60 kg | |
| Yukio Odagiri | BOX | Olympics | 1976 | 0–0–1 1978 Bangkok BOX bronze: lightweight -60 kg | |
| Emiko Odaka | VVO | Olympics | 1984 | 0–1–0 1982 New Delhi VVO silver | |
| Edidiong Odiong | ATH | Olympics | 2016 | 3–1–0 2018 Jakarta/Palembang ATH gold: 100 m, 200 m, and 4×100 m relay, silver: 4×400 m relay | |
| Yuko Oga | BKB | Olympics | 2004 | 0–0–2 2006 Doha BKB bronze; 2010 Guangzhou BKB bronze | |
| Akari Ogata | JUD | Olympics | 2012 | 0–1–0 2010 Guangzhou JUD silver: half-heavyweight -78 kg | |
| Shigeo Ogata | SWM | Olympics | 1984—1992 | 1–4–0 1986 Seoul SWM gold: 4×200 m freestyle relay, silver: 200 m freestyle, 400 m freestyle, 1500 m freestyle, and 4×100 m freestyle relay | |
| Naoya Ogawa | JUD | Olympics | 1992—1996 | 0–0–1 1990 Beijing JUD bronze: heavyweight +95 kg | |
| Satoshi Ogawa | FEN | Olympics | 2008 | 0–0–1 2010 Guangzhou FEN bronze: sabre team | |
| Aritatsu Ogi | FBL | Olympics | 1964—1968 | 0–0–1 1966 Bangkok FBL bronze | |
| Masaji Ogino | VVO | Olympics | 1992—2008 | 0–0–1 1990 Beijing VVO bronze | |
| Chiharu Ogiwara | BOX | Olympics | 1984 | 0–1–0 1986 Seoul BOX silver: light-middleweight -71 kg | |
| Chiharu Ogiwara | BOX | Olympics | 1984 | 0–1–0 1986 Seoul BOX silver: light-middleweight -71 kg | |
| Oleg Ogorodov | TEN | Olympics | 1996 | 0–0–4 1998 Bangkok TEN bronze: team; 2002 Busan TEN bronze: singles, mixed doubles, and team | |
| Femi Ogunode | ATH | Olympics | 2016—2020 | 4–0–0 2010 Guangzhou ATH gold: 200 m and 400 m; 2014 Incheon ATH gold: 100 m and 200 m | |
| Kumiko Ogura | BDM | Olympics | 2008 | 0–1–1 2006 Doha BDM silver: team, bronze: doubles | |
| Shinji Ogura | ATH | Olympics | 1968 | 1–0–0 1970 Bangkok ATH gold: long jump | |
| Keiji Ogushi | ATH | Olympics | 1956—1964 | 2–1–1 1958 Tokyo ATH gold: 4×400 m relay, silver: 400 m hurdles; 1962 Jakarta ATH gold: 400 m hurdles, bronze: 4×400 m relay | |
| Christopher Oh | WPO | Olympics | 1956 | 1–0–0 1954 Manila WPO gold | |
| Oh Dae-Geun | HOC | Olympics | 2012 | 0–0–1 2014 Incheon HOC bronze | |
| Oh Eun-Seok | FEN | Olympics | 2004—2012 | 1–3–1 2006 Doha FEN silver: sabre and sabre team; 2010 Guangzhou FEN silver: sabre team, bronze: sabre; 2014 Incheon FEN gold: sabre team | |
| Oh Go-Un | HOC | Olympics | 2000—2004 | 0–1–0 2002 Busan HOC silver | |
| Oh Gwang-Su | BOX | Olympics | 1988 | 1–0–0 1986 Seoul BOX gold: light-flyweight -48 kg | |
| Oh Gwang-Su | BOX | Olympics | 1988 | 1–0–0 1986 Seoul BOX gold: light-flyweight -48 kg | |
| Oh Gyo-Mun | ARC | Olympics | 1996—2000 | 2–0–0 1994 Hiroshima ARC gold: team; 1998 Bangkok ARC gold: team | |
| Oh Ha-Na | FEN | Olympics | 2012 | 2–0–0 2010 Guangzhou FEN gold: foil team; 2014 Incheon FEN gold: foil team | |
| Oh Jae-Seok | FBL | Olympics | 2012 | 0–0–1 2010 Guangzhou FBL bronze | |
| Oh Jin-Hyeok | ARC | Olympics | 2012—2020 | 2–1–1 2010 Guangzhou ARC gold: team; 2014 Incheon ARC gold: individual, bronze: team; 2018 Jakarta/Palembang ARC silver: team | |
| Oh Seong-Ok | HBL | Olympics | 1992—2008 | 2–0–0 1990 Beijing HBL gold; 1994 Hiroshima HBL gold | |
| Oh Seong-Sik | BKB | Olympics | 1996 | 0–1–0 1994 Hiroshima BKB silver | |
| Oh Seung-Hwan | BBL | Olympics | 2008—2020 | 0–0–1 2006 Doha BSB bronze | |
| Oh Seung-Sin | HOC | Olympics | 1996—2000 | 2–0–0 1994 Hiroshima HOC gold; 1998 Bangkok HOC gold | |
| Oh Seung-Sun | FEN | Olympics | 1984 | 0–1–0 1986 Seoul FEN silver: foil team | |
| Oh Yeong-Ran | HBL | Olympics | 1996—2016 | 2–0–0 1994 Hiroshima HBL gold; 1998 Bangkok HBL gold | |
| Oh Yun-Seok | HBL | Olympics | 2004 | 1–1–0 2010 Guangzhou HBL gold; 2014 Incheon HBL silver | |
| Masanobu Ohata | SHO | Olympics | 1976 | 0–2–0 1974 Tehran SHO silver: 50 m free pistol and 50 m free pistol | |
| Takahiro Ohata | HBL | Olympics | 1984 | 0–1–1 1982 New Delhi HBL silver; 1986 Seoul HBL bronze | |
| Mitsuhiro Ohira | WRE | Olympics | 1956 | 0–0–1 1958 Tokyo WRE bronze: freestyle heavyweight +87 kg | |
| Asumi Ohmura | CSP | Olympics | 2012 | 0–1–2 2010 Guangzhou CSP silver: K2 500 m, bronze: K4 500 m; 2014 Incheon CSP bronze: K2 500 m | |
| Shinobu Ohno | FBL | Olympics | 2008—2012 | 1–1–0 2006 Doha FBL silver; 2010 Guangzhou FBL gold | |
| Satokazu Ohtsuka | HOC | Non-starter | 1968 | 0–0–2 1966 Bangkok HOC bronze; 1970 Bangkok HOC bronze | |
| Masashi Ohuchi | WLF | Olympics | 1964—1968 | 2–0–0 1966 Bangkok WLF gold: middleweight -75 kg; 1970 Bangkok WLF gold: light-heavyweight -82.5 kg | |
| Yoshiaki Oiwa | EVE | Olympics | 2008—2024 | 4–1–1 2006 Doha EJP gold: Three-Day Event individual, silver: Three-Day Event team; 2010 Guangzhou EJP gold: Three-Day Event team, bronze: Three-Day Event individual; 2018 Jakarta/Palembang EJP gold: Three-Day Event individual and Three-Day Event team | |
| Hossein Ojaghi | WSU | Non-Medal | 2008 | 1–1–0 1998 Bangkok WUS silver: Sanshou -70 kg; 2002 Busan WUS gold: Sanshou -70 kg | |
| Ok Gyeong-Suk | JUD | Non-Medal | 1988 | 0–0–1 1990 Beijing JUD bronze: extra-lightweight -48 kg | |
| Tomoko Oka | FEN | Olympics | 1984—1988 | 0–0–1 1986 Seoul FEN bronze: foil team | |
| Tsutomu Okabori | CTR | Olympics | 1976 | 1–0–0 1978 Bangkok CRD gold: road time trial team | |
| Hirotaka Okada | JUD | Olympics | 1988—1992 | 1–0–0 1990 Beijing JUD gold: middleweight -86 kg | |
| Kumiko Okada | ATH | Olympics | 2016—2024 | 0–0–1 2018 Jakarta/Palembang ATH bronze: 20 km walk | |
| Mariko Okamoto | VVO | Olympics | 1972—1976 | 1–0–0 1974 Tehran VVO gold | |
| Noboru Okamoto | ATH | Olympics | 1960—1964 | 1–0–0 1962 Jakarta ATH gold: hammer throw | |
| Ikuko Okamura | HOC | Olympics | 2008 | 0–1–0 2006 Doha HOC silver | |
| Teruichi Okamura | GAR | Olympics | 1972 | 0–1–1 1978 Bangkok GAR silver: team, bronze: rings | |
| Eitaro Okano | ATH | Olympics | 1952 | 2–1–0 1951 New Delhi ATH gold: 400 m and 400 m hurdles, silver: 4×400 m relay | |
| Tomoyuki Okano | ROW | Olympics | 1988 | 0–0–1 1986 Seoul ROW bronze: coxed fours | |
| Keigo Okawa | WPO | Olympics | 2016—2024 | 0–2–0 2014 Incheon WPO silver; 2018 Jakarta WPO silver | |
| Masumi Okawa | GAR | Olympics | 1996 | 0–1–0 1994 Hiroshima GAR silver: team | |
| Naoto Okazaki | FEN | Olympics | 2000 | 0–1–1 1998 Bangkok FEN silver: foil team; 2002 Busan FEN bronze: foil team | |
| Takayuki Okazaki | ATH | Olympics | 1960—1964 | 1–2–0 1962 Jakarta ATH gold: long jump, silver: 4×100 m relay; 1966 Bangkok ATH silver: long jump | |
| Akemi Okazato | BKB | Olympics | 1996 | 1–1–0 1994 Hiroshima BKB silver; 1998 Bangkok BKB gold | |
| Seiji Oko | VVO | Olympics / Coach | 1968—1992 | 1–0–0 1970 Bangkok VVO gold | |
| Hideaki Okubo | BBL | Olympics | 1996 | 1–0–0 1994 Hiroshima BSB gold | |
| Hideaki Okubo | BBL | Olympics | 1996 | 1–0–0 1994 Hiroshima BSB gold | |
| Yoshito Okubo | FBL | Olympics | 2004 | 0–1–0 2002 Busan FBL silver | |
| Shinji Okuda | HBL | Olympics | 1988 | 0–0–1 1986 Seoul HBL bronze | |
| Nozomi Okuhara | BDM | Olympics | 2016—2020 | 1–0–0 2018 Jakarta/Palembang BDM gold: team | |
| Yoshihiro Okumura | SWM | Olympics | 2004—2008 | 2–4–0 2002 Busan SWM gold: 4×200 m freestyle relay and 4×100 m medley relay, silver: 200 m freestyle and 4×100 m freestyle relay; 2010 Guangzhou SWM silver: 4×100 m freestyle relay (swam in heats only) and 4×200 m freestyle relay (swam in heats only) | |
| Fumiko Okuno | SWA | Olympics | 1992 | 2–0–0 1994 Hiroshima SWA gold: solo and duet | |
| Hiroaki Okuno | VVO | Olympics | 1984 | 1–0–0 1982 New Delhi VVO gold | |
| Keisuke Okuno | SWM | Olympics | 1984 | 1–2–0 1982 New Delhi SWM silver: 1500 m freestyle; 1986 Seoul SWM gold: 4×200 m freestyle relay, silver: 4×100 m freestyle relay | |
| Ryuzo Okuno | EJP | Olympics | 1988—1992 | 2–1–1 1986 Seoul EJP gold: jumping team, bronze: jumping individual; 1994 Hiroshima EJP gold: jumping team, silver: jumping individual | |
| Zenji Okuzawa | ATH | Olympics | 1964 | 0–0–1 1962 Jakarta ATH bronze: 3000 m steeplechase | |
| Om Jong-Guk | WLF | Olympics | 1976 | 0–1–0 1974 Tehran WLF featherweight -60 kg silver: clean & jerk | |
| Om Jong-Ran | FBL | Olympics | 2008 | 1–0–0 2006 Doha FBL gold | |
| Om Yun-Chol | WLF | Olympics | 2012—2016 | 2–0–0 2014 Incheon WLF gold: bantamweight -56 kg; 2018 Jakarta/Palembang WLF gold: bantamweight -56 kg | |
| Kano Omata | SWA | Olympics | 2016 | 0–1–0 2018 Jakarta/Palembang DIV silver: team | |
| Masashi Omiya | CRD | Olympics | 1960—1964 | 0–1–0 1962 Jakarta CRD silver: road race | |
| Shigenori Omori | ATH | Olympics | 1984 | 1–1–0 1982 New Delhi ATH gold: 4×400 m relay, silver: 400 m hurdles | |
| Naser Al-Omran | FBL | Olympics | 2000 | 0–1–0 1998 Bangkok FBL silver | |
| Somporn On-Chim | SHO | Olympics | 1976 | 0–0–2 1974 Tehran SHO bronze: 50 m standard rifle 3 positions and 50 m standard rifle 3 positions team | |
| Ally Ong | SHO | Olympics | 1976 | 0–0–1 1974 Tehran SHO bronze: skeet team | |
| Ong Ewe Hock | BDM | Olympics | 1996—2000 | 0–0–2 1994 Hiroshima BDM bronze: team; 2002 Busan BDM bronze: team | |
| Jeffrey Ong | SWM | Olympics | 1988—1992 | 0–1–0 1990 Beijing SWM silver: 1500 m freestyle | |
| Katsumasa Onishi | SHO | Olympics | 1992 | 1–0–1 1986 Seoul SHO gold: 25 m centre fire pistol team; 1990 Beijing SHO bronze: 25 m rapid-fire pistol team | |
| Hitoshi Ono | BBL | Olympics | 1996 | 1–0–0 1994 Hiroshima BSB gold | |
| Hitoshi Ono | BBL | Olympics | 1996 | 1–0–0 1994 Hiroshima BSB gold | |
| Mayumi Ono | HOC | Olympics | 2008—2016 | 1–1–2 2002 Busan HOC bronze; 2006 Doha HOC silver; 2010 Guangzhou HOC bronze; 2018 Jakarta/Palembang HOC gold | |
| Shohei Ono | JUD | Olympics | 2016—2020 | 2–0–0 2018 Jakarta/Palembang JUD gold: lightweight -73 kg and team | |
| Takashi Ono | JUD | Olympics | 2008 | 1–0–1 2006 Doha JUD bronze: half-middleweight -81 kg; 2010 Guangzhou JUD gold: middleweight -90 kg | |
| Shiho Onodera | FBL | Olympics / Non-starter | 1996—2004 | 0–0–1 1998 Bangkok FBL bronze | |
| Rogelio Onofre | ATH | Olympics | 1960—1968 | 1–0–2 1962 Jakarta ATH gold: 4×100 m relay, bronze: 100 m; 1966 Bangkok ATH bronze: 4×100 m relay | |
| Kenji Onuma | WLF | Olympics | 1956—1960 | 0–1–0 1958 Tokyo WLF silver: lightweight -67.5 kg | |
| Oo Sandi | WSU | Non-Medal | 2008 | 0–1–0 2010 Guangzhou WUS silver: Changquan | |
| Ooi Tze Liang | DIV | Olympics / YOG | 2010—2016 | 0–2–1 2010 Guangzhou DIV silver: synchronised platform; 2014 Incheon DIV silver: synchronised springboard, bronze: synchronised platform | |
| Oon Jin Gee | SWM | Olympics | 1984—1988 | 0–0–2 1986 Seoul SWM bronze: 4×100 m freestyle relay and 4×200 m freestyle relay | |
| Oon Jin Teik | SWM | Olympics / Administrator | 1984—2008 | 0–0–1 1986 Seoul SWM bronze: 4×200 m freestyle relay | |
| Askar Orazalinov | WPO | Olympics / Coach | 2000—2004 | 3–0–0 1994 Hiroshima WPO gold; 1998 Bangkok WPO gold; 2002 Busan WPO gold | |
| Orgodolyn Üitümen | WRE | Olympics | 2012—2016 | 0–0–1 2018 Jakarta/Palembang WRE bronze: freestyle light-heavyweight -86 kg | |
| Constancio Ortiz | BKB | Olympics | 1960 | 1–0–0 1958 Tokyo BKB gold | |
| Alejandro Ortuoste | BOX | Olympics | 1952 | 1–0–0 1954 Manila BOX gold: bantamweight -54 kg | |
| Jun Osakada | ATH | Olympics | 1996—2004 | 1–0–0 1998 Bangkok ATH gold: 4×400 m relay | |
| Keiko Osaki-Otsubo | DIV | Olympics | 1964—1972 | 2–0–0 1966 Bangkok DIV gold: 3 m springboard and platform (competed as Keiko Osaki) | |
| Satoshi Osaki | ATH | Non-starter | 2008 | 0–0–1 2006 Doha ATH bronze: marathon | |
| Suguru Osako | ATH | Olympics | 2016—2024 | 0–1–0 2014 Incheon ATH silver: 10000 m | |
| Seiichi Osanai | WRE | Olympics | 1984 | 1–0–0 1986 Seoul WRE gold: Greco-Roman featherweight -62 kg | |
| Tetsuo Osawa | CRD/CTR | Olympics | 1956—1960 | 1–0–0 1958 Tokyo CRD gold: 1000 m track time trial | |
| Kyoko Oshima | GAR | Olympics | 2004—2008 | 0–2–2 2002 Busan GAR bronze: team; 2006 Doha GAR silver: team, bronze: floor; 2010 Guangzhou GAR silver: team | |
| Yasukuni Oshima | BKB | Olympics | 1960 | 0–1–0 1962 Jakarta BKB silver | |
| Yukiharu Oshita | WPO | Olympics | 1972 | 1–0–0 1970 Bangkok WPO gold | |
| Stanislav Osinsky | SWM | Olympics | 2004—2008 | 0–0–1 2010 Guangzhou SWM bronze: 4×100 m medley relay | |
| Sayuri Osuga | CTR/SSK | Olympics | 2002—2006 | 0–1–0 2002 Busan CRD silver: 500 m track time trial | |
| Akira Ota | WRE | Olympics | 1984—1992 | 0–0–1 1982 New Delhi WRE bronze: freestyle light-heavyweight -90 kg | |
| Shinichi Ota | CTR | Olympics | 2000 | 1–0–0 2002 Busan CRD gold: keirin | |
| Shinobu Ota | WRE | Olympics | 2016 | 1–0–0 2018 Jakarta/Palembang WRE gold: Greco-Roman featherweight -60 kg | |
| Takuya Ota | WRE | Olympics | 1996 | 0–1–0 1994 Hiroshima WRE silver: freestyle welterweight -74 kg | |
| Tomio Ota | ATH | Olympics | 1960—1964 | 0–1–1 1958 Tokyo ATH bronze: triple jump; 1962 Jakarta ATH silver: triple jump | |
| Yoko Ota | ATH | Olympics | 2000 | 1–0–0 1998 Bangkok ATH gold: high jump | |
| Yuki Ota | FEN | Olympics / Administrator | 2004—2021 | 2–1–3 2006 Doha FEN gold: foil, bronze: foil team; 2010 Guangzhou FEN silver: foil team, bronze: foil; 2014 Incheon FEN gold: foil team, bronze: foil | |
| Hideyuki Otake | VVO | Olympics | 1992 | 1–0–1 1990 Beijing VVO bronze; 1994 Hiroshima VVO gold | |
| Nami Otake | FBL | Olympics | 1996 | 0–0–1 1998 Bangkok FBL bronze | |
| Mio Otani | FBL | Olympics | 2004 | 0–0–1 2002 Busan FBL bronze | |
| Sachiko Otani | VVO | Olympics | 1984 | 0–1–0 1986 Seoul VVO silver | |
| Otgonbaataryn Uuganbaatar | JUD | Olympics | 2016 | 0–0–1 2018 Jakarta/Palembang JUD bronze: half-middleweight -81 kg | |
| Naser Al-Othman | FBL | Olympics | 2000 | 0–1–0 1998 Bangkok FBL silver | |
| Ai Otomo-Yamamoto | VVO | Olympics | 2004—2012 | 0–0–1 2002 Busan VVO bronze (competed as Ai Otomo) | |
| Otryadyn Gündegmaa | SHO | Olympics / Closing Flagbearer | 1996—2020 | 0–1–5 1998 Bangkok SHO bronze: 25 m sporting pistol team; 2002 Busan SHO bronze: 25 m sporting pistol; 2006 Doha SHO bronze: 25 m sporting pistol team; 2010 Guangzhou SHO silver: 25 m sporting pistol team; 2014 Incheon SHO bronze: 10 m air pistol team and 25 m sporting pistol | |
| Toshio Otsubo | DIV | Olympics | 1964—1968 | 0–1–0 1970 Bangkok DIV silver: platform | |
| Miyako Otsuka | BKB | Olympics | 1976 | 1–0–0 1974 Tehran BKB gold | |
| Shiho Otsuka | HOC | Olympics | 2012 | 0–0–1 2010 Guangzhou HOC bronze | |
| Ou Ching-Chieh | SBL | Olympics | 1996 | 0–0–1 1998 Bangkok SOF bronze | |
| Ou Jingbai | SBL | Olympics | 1996 | 2–0–0 1990 Beijing SOF gold; 1994 Hiroshima SOF gold | |
| Ou Zixia | HOC | Olympics / Closing Flagbearer | 2016—2024 | 0–0–1 2018 Jakarta/Palembang HOC bronze | |
| Masafumi Oura | VVO | Olympics | 1992 | 1–0–1 1990 Beijing VVO bronze; 1994 Hiroshima VVO gold | |
| Moukheld Al-Outaibi | ATH | Olympics | 2008—2016 | 2–0–0 2002 Busan ATH gold: 5000 m and 10000 m | |
| Ouyang Kunpeng | SWM | Olympics | 2000—2004 | 0–5–1 2002 Busan SWM silver: 4×100 m medley relay, bronze: 200 m medley; 2006 Doha SWM silver: 50 m backstroke, 100 m backstroke, 200 m backstroke, and 4×100 m medley relay | |
| Ow Soon Kooi | HOC | Olympics | 1976—1984 | 0–0–1 1974 Tehran HOC bronze | |
| Kana Oyama | VVO | Olympics | 2004 | 0–0–1 2002 Busan VVO bronze | |
| Taeko Oyama | BKB | Olympics | 1996—2004 | 1–1–0 1994 Hiroshima BKB silver; 1998 Bangkok BKB gold | |
| Oyuunbilegiin Pürevbaatar | WRE | Olympics | 2000—2004 | 1–1–0 1998 Bangkok WRE silver: freestyle featherweight -58 kg; 2002 Busan WRE gold: freestyle lightweight -60 kg | |
| Michiharu Ozaki | SHO | Olympics | 1976 | 0–0–2 1974 Tehran SHO bronze: 50 m small-bore rifle prone team and 50 m small-bore rifle 3 positions team | |
| Misaki Ozawa | HOC | Olympics | 2008 | 0–1–0 2006 Doha HOC silver | |
| Eddie Pacheco | BKB | Olympics | 1960 | 1–0–0 1962 Jakarta BKB gold | |
| Damrong Pachonyut | SHO | Olympics | 1972—1984 | 0–0–1 1978 Bangkok SHO bronze: trap team | |
| Pae Gil-Su | GAR | Olympics | 1992—2000 | 2–0–1 1990 Beijing GAR gold: horizontal bar, bronze: pommelled horse; 1998 Bangkok GAR gold: pommelled horse | |
| Paek Jong-Suk | SHO | Olympics | 1992 | 0–0–2 1990 Beijing SHO bronze: 10 m air pistol team and 25 m sporting pistol team | |
| Leander Paes | TEN | Olympics / Opening Flagbearer | 1992—2016 | 5–0–3 1990 Beijing TEN bronze: team; 1994 Hiroshima TEN gold: doubles and team, bronze: singles; 2002 Busan TEN gold: doubles, bronze: mixed doubles; 2006 Doha TEN gold: doubles and mixed doubles | |
| Edgardo Pagarigan | CTR | Olympics | 1984 | 0–0–1 1982 New Delhi CRD bronze: points race | |
| Ahmed Paidayesh | WPO | Olympics | 1976 | 1–0–0 1974 Tehran WPO gold | |
| Paidjo | FBL | Non-starter | 1956 | 0–0–1 1958 Tokyo FBL bronze | |
| Pak Dong-Geun | WLF | Olympics | 1972 | 0–1–0 1974 Tehran WLF flyweight -52 kg silver: clean & jerk | |
| Pak Hyon-Suk | WLF | Olympics / Closing Flagbearer | 2004—2008 | 0–1–1 2006 Doha WLF bronze: lightweight -58 kg; 2010 Guangzhou WLF silver: lightweight -58 kg | |
| Pak Jong-Chol | JUD | Olympics | 1980 | 0–0–1 1990 Beijing JUD bronze: middleweight -86 kg | |
| Pak Jong-Hun | FBL | Olympics | 1976 | 1–0–0 1978 Bangkok FBL gold | |
| Pak Jong-Ran | SHO | Olympics | 1992—2008 | 1–2–0 1990 Beijing SHO gold: skeet, silver: skeet team; 2006 Doha SHO silver: skeet team | |
| Pak Ui-Myong | WLF | Olympics | 1992 | 0–1–0 1990 Beijing WLF silver: light-heavyweight -82.5 kg | |
| Ali Pakdaman | FEN | Olympics | 2016—2024 | 0–2–1 2014 Incheon FEN silver: sabre team; 2018 Jakarta/Palembang FEN silver: sabre team, bronze: sabre | |
| Amrit Pal | ATH | Olympics | 1964 | 0–1–1 1962 Jakarta ATH silver: 1500 m, bronze: 800 m | |
| Buoban Pamang | ATH | Olympics | 2008 | 1–0–0 2006 Doha ATH gold: javelin throw | |
| Pan Bing | TEN | Olympics | 1996 | 3–1–1 1990 Beijing TEN gold: singles and team, silver: doubles; 1994 Hiroshima TEN gold: singles, bronze: doubles | |
| C. T. Pan | GLF | Olympics | 2016—2024 | 2–1–1 2006 Doha GLF silver: individual, bronze: team; 2014 Incheon GLF gold: individual and team | |
| Pan Kou-Ang | SHO | Olympics | 1964—1968 | 0–0–1 1966 Bangkok SHO bronze: 50 m small-bore rifle prone team | |
| Pan Lina | FBL | Non-starter | 2000 | 0–1–1 2002 Busan FBL silver; 2006 Doha FBL bronze | |
| Pan Qiang | SHO | Olympics | 2016 | 1–0–0 2010 Guangzhou SHO gold: double trap team | |
| Pan Shenghua | WPO | Olympics | 1984 | 1–0–0 1982 New Delhi WPO gold | |
| Pan Song | JUD | Olympics | 2000—2008 | 0–0–1 1998 Bangkok JUD bronze: heavyweight +100 kg | |
| Pan Tzu-Hui | SBL | Olympics | 2004—2008 | 0–2–0 2002 Busan SOF silver; 2006 Doha SOF silver | |
| Pan Wei | BKB | Olympics | 2004 | 1–1–0 1998 Bangkok BKB silver; 2002 Busan BKB gold | |
| Pan Wei-Lun | BBL | Olympics | 2004—2008 | 1–2–0 2002 Busan BSB silver; 2006 Doha BSB gold; 2010 Guangzhou BSB silver | |
| Pan Yao | CSP | Olympics | 2008 | 0–1–0 2010 Guangzhou CSP silver: K1 1000 m | |
| Lakhshmi Kant Pandey | WRE | Olympics | 1956 | 0–0–1 1962 Jakarta WRE bronze: freestyle welterweight -78 kg | |
| Donald Pandiangan | ARC | Olympics | 1976—1984 | 0–1–1 1978 Bangkok ARC bronze: team; 1982 New Delhi ARC silver: team | |
| Purnama Pandiangan | ARC | Olympics | 1992 | 0–1–0 1994 Hiroshima ARC silver: team | |
| Aleksey Panfili | WPO | Olympics | 1996—2012 | 2–0–0 2010 Guangzhou WPO gold (competed for Kazakhstan); 2014 Incheon WPO gold (competed for Kazakhstan) | |
| Pang Jiaying | SWM | Olympics | 2004—2012 | 4–2–0 2006 Doha SWM gold: 200 m freestyle, 4×100 m freestyle relay, 4×200 m freestyle relay, and 4×100 m medley relay, silver: 50 m freestyle and 100 m freestyle |