Host cities:
| Athlete | Nation(s) | Sport(s) | Role(s) | Era | Notes |
|---|---|---|---|---|---|
| Ayaka Nishimura | HOC | Olympics | 2016 | 0–0–1 2013 Kazan HOK bronze | |
| Motoki Nishimura | JUD | Olympics | 1972 | 1–0–0 1967 Tokyo JUD gold: heavyweight +93 kg | |
| Shiho Nishioka | FEN | Olympics | 2012—2016 | 0–0–1 2007 Bangkok FEN bronze: foil team | |
| Yoshie Nishioka | SWM | Olympics | 1988 | 0–2–0 1993 Buffalo SWI silver: 200 m breaststroke; 1995 Fukuoka SWI silver: 4×100 m medley relay | |
| Masashi Nishiyama | JUD | Olympics | 2012 | 0–0–1 2009 Beograd JUD bronze: team | |
| Koki Niwa | TTE | Olympics / YOG | 2010—2020 | 0–2–1 2013 Kazan TTN silver: mixed doubles and team, bronze: singles | |
| Sunder Nix | ATH | Olympics | 1984 | 1–0–1 1983 Edmonton ATH gold: 4×400 m relay, bronze: 400 m | |
| Catherine Nixon | FEN | YOG | 2014 | 0–1–0 2017 Taipei FEN silver: épée team | |
| Patricia Noall | SWM | Olympics | 1988 | 2–1–3 1991 Sheffield SWI gold: 400 m freestyle, silver: 200 m freestyle, bronze: 400 m medley, 4×100 m freestyle relay, and 4×200 m freestyle relay; 1993 Buffalo SWI gold: 4×200 m freestyle relay (competed as Noall-Lauzon) | |
| Cindy Noble | BKB | Olympics | 1984 | 1–0–0 1979 Ciudad de México BAS gold | |
| Avognan Nogboum | ATH | Olympics / Opening Flagbearer | 1976—1984 | 0–1–0 1979 Ciudad de México ATH silver: 4×100 m relay | |
| Yasuhiro Noguchi | VVO | Olympics | 1972 | 1–0–0 1967 Tokyo VOL gold | |
| Sean Nolan | WPO | Olympics | 2000 | 1–0–0 1993 Buffalo WAP gold | |
| Frane Nonković | WPO | Olympics | 1964 | 1–0–0 1961 Sofia WAP gold | |
| Alessandro Nora | WPO | Olympics | 2016 | 0–1–0 2015 Gwangju WAP silver | |
| Wolfgang Nordwig | ATH | Olympics | 1968—1972 | 1–0–0 1970 Torino ATH gold: pole vault | |
| Helen Norfolk | SWM | Olympics | 2000—2008 | 0–3–0 2005 İzmir SWI silver: 200 m medley, 4×100 m freestyle relay, and 4×200 m freestyle relay | |
| Yana Noskova | TTE | Olympics / YOG | 2010—2020 | 0–0–6 2013 Kazan TTN bronze: doubles and team; 2015 Gwangju TTN bronze: mixed doubles; 2019 Napoli TTN bronze: doubles, mixed doubles, and team | |
| Gruia Novac | WPO | Olympics | 1964—1972 | 0–0–1 1965 Budapest WAP bronze | |
| Yevgeny Novikov | SWM | Olympics | 1964 | 0–1–0 1965 Budapest SWI silver: 4×200 m freestyle relay | |
| Yelena Novikova-Belova | FEN | Olympics | 1968—1980 | 1–1–1 1970 Torino FEN gold: foil team (competed as Yelena Belova); 1973 Moskva FEN silver: foil team, bronze: foil (competed as Yelena Belova) | |
| Nikolai Novosjolov | FEN | Olympics | 2000—2016 | 0–0–1 2001 Beijing FEN bronze: épée | |
| Josef Novotný | VVO | Olympics | 1980 | 0–1–0 1977 Sofia VOL silver | |
| Roman Novotný | ATH | Olympics | 2008—2012 | 0–0–1 2007 Bangkok ATH bronze: long jump | |
| Teresa Nowak | ATH | Olympics | 1972 | 0–1–0 1975 Roma ATH silver: 100 m hurdles | |
| Józef Nowara | FEN | Olympics | 1968—1976 | 0–0–1 1973 Moskva FEN bronze: sabre team | |
| Jarosław Nowicki | ROW | Olympics | 1996 | 0–0–1 1993 Buffalo ROW bronze: quadruple sculls | |
| Danek Nowosielski | FEN | Olympics | 1988—1996 | 0–1–0 1987 Zagreb FEN silver: épée team | |
| Zenon Nowosz | ATH | Olympics | 1968—1976 | 1–0–0 1970 Torino ATH gold: 4×100 m relay | |
| Mubarak Sultan Al-Nubi Faraj | ATH | Olympics | 1996—2000 | 0–0–1 1997 Catania ATH bronze: 400 m hurdles | |
| Andrea Nugent | SWM | Olympics | 1988—1992 | 0–2–3 1991 Sheffield SWI silver: 4×100 m medley relay, bronze: 100 m freestyle and 4×100 m freestyle relay; 1993 Buffalo SWI silver: 4×100 m freestyle relay, bronze: 4×100 m medley relay | |
| Mauro Numa | FEN | Olympics | 1984—1992 | 3–1–2 1981 București FEN gold: foil team; 1983 Edmonton FEN foil team, silver: foil; 1985 Kobe FEN bronze: foil team; 1989 Duisburg FEN gold: foil, bronze: foil team | |
| Liya Nurkina | TKW | Olympics | 2008 | 0–0–1 2007 Bangkok TKW bronze: welterweight -67 kg | |
| Kai Nürnberger | BKB | Olympics | 1992 | 0–0–1 1989 Duisburg BAS bronze (competed for West Germany) | |
| Ruslan Nurudinov | WLF | Olympics | 2012—2016 | 1–0–0 2013 Kazan WLT gold: heavyweight -105 kg | |
| Carlos Nuzman | VVO | Olympics / Administrator | 1964—2017 | 0–0–1 1963 Porto Alegre VOL bronze | |
| Nyantain Bayaraa | SHO | Olympics | 2012—2024 | 0–1–0 2011 Shenzhen SHO silver: 50 m rifle prone team | |
| Jarmila Nygrýnová | ATH | Olympics | 1972—1980 | 1–1–0 1975 Roma ATH gold: long jump; 1977 Sofia ATH silver: long jump | |
| Erik Nys | ATH | Olympics | 1996—2000 | 0–0–1 1999 Palma de Mallorca ATH bronze: long jump | |
| O Jong-Ae | WLF | Olympics | 2008 | 1–0–0 2011 Shenzhen WLT gold: lightweight -58 kg | |
| Brittany O'Brien | DIV | Olympics | 2016 | 0–1–0 2017 Taipei DIV silver: synchronized platform | |
| Mike O'Brien | SWM | Olympics | 1984 | 0–1–0 1985 Kobe SWI silver: 1500 m freestyle | |
| Jessica O'Connell | ATH | Olympics | 2016 | 0–1–0 2017 Taipei ATH silver: 1500 m | |
| Patrick O'Connor | ATH | Olympics | 1992 | 2–1–0 1989 Duisburg ATH gold: 4×400 m relay; 1991 Sheffield ATH gold: 400 m, silver: 4×400 m relay | |
| Diane O'Grady | ROW | Olympics | 1996 | 1–0–0 1993 Buffalo ROW gold: coxless fours | |
| Turlough O'Hare | SWM | Olympics | 1988—1992 | 2–0–3 1991 Sheffield SWI bronze: 200 m freestyle and 4×200 m freestyle relay; 1993 Buffalo SWI gold: 400 m freestyle and 800 m freestyle, bronze: 200 m freestyle | |
| Eileen O'Keeffe | ATH | Olympics | 2008 | 0–1–0 2007 Bangkok ATH silver: hammer throw | |
| Brandon O'Neill | GAR | Olympics | 2008 | 1–0–0 2005 İzmir GYM gold: floor | |
| Derval O'Rourke | ATH | Olympics | 2004—2012 | 0–0–2 2005 İzmir ATH bronze: 100 m hurdles and 4×100 m relay | |
| Sonia O'Sullivan | ATH | Olympics / Opening Flagbearer | 1992—2004 | 1–1–0 1991 Sheffield ATH gold: 1500 m, silver: 3000 m | |
| Gary O'Toole | SWM | Olympics | 1988—1992 | 1–0–0 1991 Sheffield SWI gold: 200 m breaststroke | |
| Maksim Oberemko | SAL | Olympics | 1996—2016 | 0–1–0 1999 Palma de Mallorca SAI silver: Windsurfer men | |
| Mark Oberman | WPO | Olympics | 1992—2000 | 0–0–1 1995 Fukuoka WAP bronze | |
| Paul Oberman | WPO | Olympics | 1992 | 0–0–2 1995 Fukuoka WAP bronze; 1997 Catania WAP bronze | |
| Fritz Obersiebraße | ATH | Olympics | 1964 | 1–0–0 1965 Budapest ATH gold: 4×100 m relay (competed for West Germany) | |
| Walter Oberste | ATH | Olympics | 1956 | 1–1–0 1959 Torino ATH gold: 4×400 m relay, silver: 400 m (competed for West Germany) | |
| Anton Obholzer | ROW | Olympics | 1988 | 0–0–1 1989 Duisburg ROW bronze: single sculls | |
| Aleksey Obmochayev | VVO | Olympics | 2012 | 1–0–0 2011 Shenzhen VOL gold | |
| Jahir Ocampo | DIV | Olympics | 2016 | 0–0–1 2017 Taipei DIV bronze: team | |
| Diego Occhiuzzi | FEN | Olympics | 2008—2016 | 0–1–1 2001 Beijing FEN silver: sabre team; 2005 İzmir FEN bronze: sabre team | |
| Ochirbatyn Nasanburmaa | WRE | Olympics | 2016 | 0–1–0 2013 Kazan WRE silver: freestyle light-heavyweight -67 kg | |
| Ochirdolgoryn Enkhtaivan | WRE | Olympics | 1972 | 0–0–1 1977 Sofia WRE bronze: freestyle light-flyweight -48 kg | |
| Emil Ochyra | FEN | Olympics | 1960—1968 | 0–1–1 1959 Torino FEN silver: sabre, bronze: sabre team | |
| Tevfik Odabaşı | WRE | Olympics | 2004—2008 | 0–1–0 2005 İzmir WRE silver: freestyle lightweight -60 kg | |
| Josef Odložil | ATH | Olympics | 1964—1968 | 0–1–0 1961 Sofia ATH silver: 4×400 m relay | |
| Marlies Oelsner-Göhr | ATH | Olympics | 1976—1988 | 1–0–0 1979 Ciudad de México ATH gold: 100 m (competed as Marlies Göhr) | |
| Maja Ognjenović | VVO | Olympics / Opening Flagbearer | 2008—2024 | 0–1–0 2009 Beograd VOL silver | |
| Andreea Ogrăzeanu | ATH | Olympics | 2012 | 0–0–2 2013 Kazan ATH bronze: 100 m and 200 m | |
| Falilat Ogunkoya | ATH | Olympics | 1988—2000 | 0–0–1 1987 Zagreb ATH bronze: 4×100 m relay | |
| Shinji Ogura | ATH | Olympics | 1968 | 0–1–0 1967 Tokyo ATH silver: 4×100 m relay | |
| Oh Eun-Seok | FEN | Olympics | 2004—2012 | 0–2–0 2003 Daegu FEN silver: sabre; 2007 Bangkok FEN silver: sabre team | |
| Oh Ha-Na | FEN | Olympics | 2012 | 0–3–0 2003 Daegu FEN silver: foil team; 2005 İzmir FEN silver: foil team; 2007 Bangkok FEN silver: foil team | |
| Oh Hye-Ri | TKW | Olympics | 2016 | 0–1–0 2009 Beograd TKW silver: middleweight -72 kg | |
| Oh Seung-Rip | JUD | Olympics | 1972 | 0–1–0 1967 Tokyo JUD silver: lightweight -80 kg | |
| Ayami Oishi | ROW | Olympics | 2016—2024 | 1–0–0 2015 Gwangju ROW gold: lightweight coxless pairs | |
| Kazuki Oiwa | FBL | Non-starter | 2012 | 1–0–0 2011 Shenzhen FTB gold | |
| Kumiko Okamoto | TEN | Olympics | 1988 | 0–1–0 1983 Edmonton TEN silver: doubles | |
| Teruichi Okamura | GAR | Olympics | 1972 | 2–0–0 1970 Torino GYM gold: all-around and team | |
| Masumi Okawa | GAR | Olympics | 1996 | 0–0–1 1997 Catania GYM bronze: team | |
| Takayuki Okazaki | ATH | Olympics | 1960—1964 | 0–2–0 1961 Sofia ATH silver: 4×100 m relay and long jump | |
| Makoto Okiguchi | GAR | Olympics | 2008 | 1–0–0 2009 Beograd GYM gold: team | |
| Reïna-Flor Okori | ATH | Olympics / Non-starter / Opening Flagbearer / Closing Flagbearer | 2004—2016 | 0–0–1 2001 Beijing ATH bronze: 4×100 m relay (competed for France) | |
| Marilyn Okoro | ATH | Olympics | 2008 | 0–0–1 2005 İzmir ATH bronze: 800 m | |
| Adam Okruashvili | JUD | Olympics | 2012—2016 | 0–0–1 2007 Bangkok JUD bronze: open class | |
| Artyom Okulov | WLF | YOG | 2010 | 0–1–0 2013 Kazan WLT silver: light-heavyweight -85 kg | |
| Yoshihiro Okumura | SWM | Olympics | 2004—2008 | 1–1–0 2003 Daegu SWI gold: 200 m freestyle; 2005 İzmir SWI silver: 4×200 m freestyle relay | |
| Oksana Okunieva | ATH | Olympics | 2016 | 1–0–0 2017 Taipei ATH gold: high jump | |
| Hiroaki Okuno | VVO | Olympics | 1984 | 0–0–1 1981 București VOL bronze | |
| Anna Olasz | OWS/SWM | Olympics / YOG | 2010—2020 | 1–0–0 2017 Taipei SWI gold: 10 km | |
| Janusz Olech | FEN | Olympics | 1988—1996 | 1–0–0 1989 Duisburg FEN gold: sabre team | |
| Elisabeta Oleniuc-Lipă | ROW | Olympics / Opening Flagbearer | 1984—2004 | 1–0–0 1989 Duisburg ROW gold: single sculls (competed as Elisabeta Lipa) | |
| Margrit Olfert | ATH | Olympics | 1972 | 1–0–0 1973 Moskva ATH gold: long jump | |
| Nicolas Oliveira | SWM | Olympics | 2008—2016 | 0–1–0 2011 Shenzhen SWI silver: 4×100 m freestyle relay | |
| André Olivier | ATH | Olympics | 2012 | 0–0–1 2011 Shenzhen ATH bronze: 4×400 m relay | |
| Nadezhda Olizarenko | ATH | Olympics | 1980—1988 | 1–0–0 1979 Ciudad de México ATH gold: 800 m (competed as Nadiya Mushta) | |
| Andrey Olkhovsky | TEN | Olympics | 1988—1996 | 0–2–0 1987 Zagreb TEN silver: doubles and mixed doubles | |
| Barb Olmsted | CSP | Olympics | 1984—1988 | 0–0–1 1987 Zagreb CAN bronze: K2 500 m | |
| Nancy Olmsted | CSP | Olympics | 1988 | 0–0–1 1987 Zagreb CAN bronze: K2 500 m | |
| Ben Olsen | FBL | Olympics | 2000 | 0–0–1 1997 Catania FTB bronze | |
| Ioana Olteanu | ROW | Olympics | 1992—2000 | 1–1–0 1993 Buffalo ROW gold: quadruple sculls. silver: coxless fours | |
| Adewale Olukoju | ATH | Olympics | 1988—1996 | 1–1–0 1991 Sheffield ATH gold: discus throw; 1993 Buffalo ATH silver: discus throw | |
| Om Jong-Ran | FBL | Olympics | 2008 | 1–0–0 2003 Daegu FTB gold | |
| Om Yun-Chol | WLF | Olympics | 2012—2016 | 1–0–0 2017 Taipei WLT gold: bantamweight -56 kg | |
| Magomed Omarov | BOX | Olympics | 2012 | 1–0–0 2013 Kazan BOX gold: super-heavyweight +91 kg | |
| Rafał Omelko | ATH | Olympics | 2016 | 0–0–2 2015 Gwangju ATH bronze: 4×400 m relay; 2017 Taipei ATH bronze: 400 m | |
| Philippe Omnès | FEN | Olympics | 1984—1996 | 0–1–0 1985 Kobe FEN silver: foil team | |
| Shigekazu Omori | ATH | Olympics | 1996 | 0–1–0 1993 Buffalo ATH silver: 4×400 m relay | |
| Jeffrey Ong | SWM | Olympics | 1988—1992 | 0–1–0 1991 Sheffield SWI silver: 1500 m freestyle | |
| Busanan Ongbamrungphan | BDM | Olympics / YOG | 2014—2020 | 0–0–1 2015 Gwangju BDM bronze: mixed team | |
| Junko Onishi | SWM | Olympics | 2000—2004 | 1–1–0 1997 Catania SWI gold: 4×100 m medley relay, silver: 100 m butterfly | |
| Takashi Ono | JUD | Olympics | 2008 | 0–1–0 2003 Daegu JUD silver: team | |
| Marta Onofre | ATH | Olympics | 2016 | 0–0–1 2017 Taipei ATH bronze: pole vault | |
| Mary Onyali-Omagbemi | ATH | Olympics / Opening Flagbearer / Closing Flagbearer | 1988—2004 | 0–1–1 1987 Zagreb ATH silver: 200 m, bronze: 4×100 m relay (competed as Mary Onyali) | |
| Reshmie Oogink | TKW | Olympics | 2016 | 0–0–3 2009 Beograd TKW bronze: middleweight -72 kg; 2015 Gwangju TKW bronze: middleweight -73 kg; 2017 Taipei TKW bronze: middleweight -73 kg | |
| John Robert Oosthuizen | ATH | Olympics | 2008 | 0–1–0 2013 Kazan ATH silver: javelin throw | |
| Christy Opara-Thompson | ATH | Olympics | 1992—1996 | 0–1–0 1993 Buffalo ATH silver: 4×100 m relay | |
| Craig Oppel | SWM | Olympics | 1988 | 2–0–0 1985 Kobe SWI gold: 4×100 m freestyle relay and 4×200 m freestyle relay | |
| Marian Oprea | ATH | Olympics / Closing Flagbearer | 2004—2016 | 0–1–0 2001 Beijing ATH silver: triple jump | |
| Nicolae Oprescu | GAR | Olympics | 1972—1980 | 0–0–2 1973 Moskva GYM bronze: team; 1977 Sofia GYM bronze: rings | |
| Arina Opyonysheva | SWM | Olympics | 2016 | 1–1–2 2017 Taipei SWI gold: 4×200 m freestyle relay, silver: 4×100 m freestyle relay, bronze: 100 m freestyle and 200 m freestyle | |
| Roman Oravec | ATH | Olympics | 2000 | 1–0–0 2003 Daegu ATH gold: 800 m | |
| Askar Orazalinov | WPO | Olympics / Coach | 2000—2004 | 1–0–0 1985 Kobe WAP gold (competed for the Soviet Union) | |
| Olga Orban-Szabo | FEN | Olympics | 1956—1972 | 1–2–0 1961 Sofia FEN gold: foil team, silver: foil; 1965 Budapest FEN silver: foil team | |
| Éva Orbán | ATH | Olympics | 2004—2012 | 0–1–0 2011 Shenzhen ATH silver: hammer throw | |
| Giovanni Orlando | SWM | Olympics | 1964 | 0–0–1 1963 Porto Alegre SWI bronze: 4×100 m freestyle relay | |
| Mark Ormrod | ATH | Olympics | 2004—2008 | 0–1–0 2007 Bangkok ATH silver: 4×400 m relay | |
| Daniela Oronova | ROW | Olympics | 1988—1996 | 1–0–0 1989 Duisburg ROW gold: quadruple sculls | |
| Rozalia Oros | FEN | Olympics | 1984 | 0–2–0 1983 Edmonton FEN silver: foil and foil team | |
| Bruno Orsoni | SWM | Olympics | 1996 | 0–2–0 1993 Buffalo SWI silver: 4×200 m freestyle relay; 1995 Fukuoka SWI silver: 4×200 m freestyle relay | |
| Alejandro Ortiz | BKB | Olympics | 1976—1980 | 0–0–1 1970 Torino BAS bronze | |
| Arturo Ortiz | ATH | Olympics | 1988—1996 | 0–1–1 1991 Sheffield ATH silver: high jump; 1993 Buffalo ATH bronze: high jump | |
| Idalys Ortiz | JUD | Olympics / Opening Flagbearer | 2008—2024 | 1–1–0 2013 Kazan JUD gold: open class, silver: heavyweight +78 kg | |
| Tatiana Ortiz | DIV | Olympics / Closing Flagbearer | 2008 | 3–1–0 2007 Bangkok DIV gold: synchronized springboard, synchronized platform, and team; 2011 Shenzhen DIV silver: synchronized platform | |
| Serena Ortolani | VVO | Olympics | 2008—2016 | 1–0–0 2009 Beograd VOL gold | |
| Martina Orzan | ROW | Olympics | 1996 | 0–0–1 1993 Buffalo ROW bronze: lightweight single sculls | |
| Yukiko Osada | SWM | Olympics | 2004 | 0–0–2 2003 Daegu SWI bronze: 200 m butterfly and 4×100 m medley relay | |
| Liliya Osadchaya | VVO | Olympics | 1976 | 1–0–0 1977 Sofia VOL gold | |
| Keiko Osaki-Otsubo | DIV | Olympics | 1964—1972 | 0–1–0 1967 Tokyo DIV silver: platform (competed as Keiko Osaki) | |
| Suguru Osako | ATH | Olympics | 2016—2024 | 1–0–0 2011 Shenzhen ATH gold: 10000 m | |
| Vitaliy Osharov | FEN | Olympics | 2004 | 2–0–0 2003 Daegu FEN gold: épée team; 2005 İzmir FEN gold: épée team | |
| Kyoko Oshima | GAR | Olympics | 2004—2008 | 1–0–0 2011 Shenzhen GYM gold: team | |
| Iuri Osip'ovi | FEN | Olympics | 1956 | 1–1–1 1959 Torino FEN gold: foil team; 1961 Sofia FEN silver: foil team; 1963 Porto Alegre FEN bronze: foil team | |
| Irina Osipova | BKB | Olympics | 2004—2012 | 0–0–1 1999 Palma de Mallorca BAS bronze | |
| Erick Osornio | TKW | Olympics | 2012 | 0–1–0 2005 İzmir TKW silver: featherweight -67 kg | |
| Ryszard Ostrowski | ATH | Olympics | 1988 | 2–0–0 1983 Edmonton ATH gold: 800 m; 1985 Kobe ATH gold: 800 m | |
| István Osztrics | FEN | Olympics | 1972—1980 | 1–2–1 1970 Torino FEN silver: épée team, bronze: épée; 1973 Moskva FEN gold: épée, silver: épée team | |
| Tomio Ota | ATH | Olympics | 1960—1964 | 0–0–1 1961 Sofia ATH bronze: triple jump | |
| Yuki Ota | FEN | Olympics / Administrator | 2004—2021 | 1–0–0 2005 İzmir FEN gold: foil team | |
| Ami Otaki | FBL | Non-starter | 2012 | 0–2–0 2009 Beograd FTB silver; 2011 Shenzhen FTB silver | |
| Toshio Otsubo | DIV | Olympics | 1964—1968 | 0–0–1 1967 Tokyo DIV bronze: platform | |
| Dave Ottley | ATH | Olympics | 1980—1988 | 0–1–0 1977 Sofia ATH silver: javelin throw | |
| Björn Otto | ATH | Olympics | 2012 | 1–0–1 2003 Daegu ATH bronze: pole vault; 2005 İzmir ATH gold: pole vault | |
| Eddy Ottoz | ATH | Olympics | 1964—1968 | 2–0–0 1965 Budapest ATH gold: 110 m hurdles; 1967 Tokyo ATH gold: 110 m hurdles | |
| Ou Shaoyan | ROW | Olympics | 1996—2000 | 1–0–0 1993 Buffalo ROW gold: lightweight coxless pairs | |
| Élodie Ouédraogo | ATH | Olympics | 2004—2012 | 0–0–1 2005 İzmir ATH bronze: 200 m | |
| Ouyang Kunpeng | SWM | Olympics | 2000—2004 | 2–1–0 2003 Daegu SWI gold: 100 m backstroke and 200 m backstroke, silver: 50 m backstroke | |
| Eszter Óváry | GAR | Olympics | 1988—1996 | 1–1–0 1995 Fukuoka GYM gold: horse vault, silver: floor | |
| Olena Ovcharova-Krasovska | ATH | Olympics | 1996—2004 | 0–1–0 1995 Fukuoka ATH silver: 100 m hurdles (competed as Olena Ovcharova) | |
| Vladimir Ovchinnikov | ATH | Olympics | 1988—2000 | 0–1–0 1991 Sheffield ATH silver: javelin throw (competed for the Soviet Union) | |
| Artem Ovchynnikov | ARC | YOG | 2018 | 0–0–1 2019 Napoli ARC bronze: Recurve team (mixed) | |
| Tatyana Ovechkina | BKB | Olympics | 1976—1980 | 2–0–0 1973 Moskva BAS gold; 1977 Sofia BAS gold | |
| Elli Overton | SWM | Olympics | 1992—2000 | 0–2–2 1997 Catania SWI silver: 200 m medley and 4×200 m freestyle relay, bronze: 400 m medley and 4×100 m freestyle relay | |
| Rod Owen-Jones | WPO | Olympics | 2000 | 0–0–2 1995 Fukuoka WAP bronze; 1997 Catania WAP bronze | |
| Rada Owen | SWM | Olympics | 2000 | 2–0–0 1999 Palma de Mallorca SWI gold: 4×100 m freestyle relay (swam in heats only) and 4×200 m freestyle relay | |
| Abi Oyepitan | ATH | Olympics | 2004—2012 | 1–0–0 2001 Beijing ATH gold: 100 m | |
| Edvin Ozolin | ATH | Olympics | 1960—1964 | 3–2–0 1961 Sofia ATH gold: 4×100 m relay; 1963 Porto Alegre ATH gold: 200 m, silver: 100 m; 1965 Budapest ATH gold: 200 m, silver: 4×100 m relay | |
| Elvīra Ozoliņa | ATH | Olympics | 1960—1964 | 1–1–0 1959 Torino ATH gold: javelin throw; 1963 Porto Alegre ATH silver: javelin throw | |
| Zeki Öztürk | ATH | Olympics | 1988—1992 | 0–1–0 1989 Duisburg ATH silver: 10000 m | |
| Rommel Pacheco | DIV | Olympics / Opening Flagbearer | 2004—2020 | 1–2–5 2005 İzmir DIV gold: platform, bronze: synchronized platform; 2007 Bangkok DIV bronze: 3 m springboard; 2009 Beograd DIV silver: platform; 2011 Shenzhen DIV silver: synchronized springboard, bronze: platform, synchronized platform and team | |
| Doug Padilla | ATH | Olympics | 1984—1988 | 1–0–0 1981 București ATH gold: 5000 m | |
| Nazario Padrón | SWM | Olympics | 1964 | 0–1–0 1963 Porto Alegre SWI silver: 200 m breaststroke | |
| Maria Pădurariu | ROW | Olympics | 1992 | 1–0–0 1993 Buffalo ROW gold: quadruple sculls | |
| Pae Gil-Su | GAR | Olympics | 1992—2000 | 1–0–0 1991 Sheffield GYM gold: horizontal bar | |
| Ramona Pagel | ATH | Olympics | 1984—1996 | 0–0–1 1985 Kobe ATH bronze: shot put | |
| Pak Yong-Ryong | DIV | Olympics | 2000—2004 | 0–2–1 2001 Beijing DIV silver: synchronized platform; 2003 Daegu DIV silver: synchronized platform; 2007 Bangkok DIV bronze: synchronized platform | |
| Ali Pakdaman | FEN | Olympics | 2016—2024 | 0–1–0 2017 Taipei FEN silver: sabre team | |
| Santa Pakenytė | JUD | Olympics | 2016 | 0–1–2 2015 Gwangju JUD bronze: heavyweight +78 kg; 2017 Taipei JUD silver: heavyweight +78 kg, bronze: open class | |
| Yuliya Pakhalina | DIV | Olympics | 2000—2008 | 1–0–1 1999 Palma de Mallorca DIV gold: 1 m springboard, bronze: 3 m springboard | |
| Igor Paklin | ATH | Olympics | 1988—1992 | 2–0–0 1983 Edmonton ATH gold: high jump (competed for the Soviet Union); 1985 Kobe ATH gold: high jump (competed for the Soviet Union) | |
| Rolando Palacios | ATH | Olympics / Opening Flagbearer | 2008—2016 | 1–0–0 2009 Beograd ATH gold: 100 m | |
| Vita Palamar | ATH | Olympics | 2000—2008 | 1–0–0 2001 Beijing ATH gold: high jump | |
| Kateryna Palekha | ARC | Olympics | 2004—2012 | 0–2–1 2003 Daegu ARC bronze: recurve team; 2005 İzmir ARC silver: recurve and recurve team | |
| Justine Palframan | ATH | Olympics | 2016 | 1–1–1 2013 Kazan ATH bronze: 4×400 m relay; 2015 Gwangju ATH gold: 400 m; 2017 Taipei ATH silver: 400 m | |
| Kerstin Palm | FEN | Olympics | 1964—1988 | 1–0–0 1967 Tokyo FEN gold: foil | |
| Ever Palma | ATH | Olympics | 2012—2024 | 0–1–0 2017 Taipei ATH silver: 20 km walk team | |
| Isaac Palma | ATH | Olympics | 2012—2020 | 0–1–0 2017 Taipei ATH silver: 20 km walk team | |
| Ana Belén Palomo | SWM | Olympics | 2000—2004 | 0–0–1 1999 Palma de Mallorca SWI bronze: 50 m freestyle | |
| Airinė Palšytė | ATH | Olympics | 2012—2024 | 1–1–1 2011 Shenzhen ATH silver: high jump; 2015 Gwangju ATH gold: high jump; 2017 Taipei ATH bronze: high jump | |
| Gregorio Paltrinieri | OWS/SWM | Olympics / Closing Flagbearer | 2012—2024 | 3–0–0 2017 Taipei SWI gold: 800 m freestyle, 1500 m freestyle, and 10 km | |
| Buoban Pamang | ATH | Olympics | 2008 | 1–0–0 2007 Bangkok ATH gold: javelin throw | |
| Pan Qiang | SHO | Olympics | 2016 | 1–1–0 2011 Shenzhen SHO gold: double trap team, silver: double trap | |
| Pan Wei | BKB | Olympics | 2004 | 1–1–0 2001 Beijing BAS silver; 2003 Daegu BAS gold | |
| Aleksandr Panfilov | CTR | Olympics | 1980 | 1–0–0 1983 Edmonton CYC gold: 1000 m time trial | |
| Pang Fengyue | FBL | Olympics | 2016 | 1–0–0 2011 Shenzhen FTB gold | |
| Pang Jiaying | SWM | Olympics | 2004—2012 | 2–2–2 2003 Daegu SWI gold: 4×200 m freestyle relay and 4×100 m medley relay, bronze: 200 m freestyle and 4×100 m freestyle relay; 2007 Bangkok SWI silver: 4×100 m freestyle relay and 4×200 m freestyle relay | |
| Pang Qiong | GRY | Olympics | 1988 | 0–0–1 1991 Sheffield RGY bronze: clubs | |
| Pang Wei | SHO | Olympics | 2008—2020 | 3–4–1 2011 Shenzhen SHO gold: 50 m free pistol team, silver: 10 m air pistol and 10 m air pistol team; 2013 Kazan SHO gold: 50 m free pistol and 25 m standard pistol team, silver: 10 m air pistol and 10 m air pistol team, bronze: 50 m free pistol team | |
| Nikolay Pankin | SWM | Olympics | 1968—1976 | 3–2–0 1970 Torino SWI gold: 100 m breaststroke, silver: 200 m breaststroke and 4×100 m medley relay; 1973 Moskva SWI gold: 100 m breaststroke and 200 m breaststroke | |
| Stefano Pantano | FEN | Olympics | 1988—1992 | 3–1–0 1983 Edmonton FEN gold: épée team; 1987 Zagreb FEN gold: épée team, silver: épée; 1989 Duisburg FEN gold: épée team | |
| Kseniya Panteleieva | FEN | Olympics | 2012—2016 | 1–0–2 2013 Kazan FEN bronze: épée team; 2017 Taipei FEN gold: épée team, bronze: épée |