Host cities:
| Athlete | Nation(s) | Sport(s) | Role(s) | Era | Notes |
|---|---|---|---|---|---|
| Michael Meeks | BKB | Olympics | 2000 | 0–1–0 1993 Buffalo BAS silver | |
| Folkert Meeuw | SWM | Olympics / Non-starter | 1968—1976 | 0–1–1 1973 Moskva SWI silver: 200 m Butterfly, 4×100 m medley relay | |
| Helge Meeuw | SWM | Olympics | 2004—2012 | 2–1–0 2007 Bangkok SWI gold: 50 m backstroke and 100 m backstroke; 2009 Beograd SWI silver: 100 m backstroke | |
| Gheorghe Megelea | ATH | Olympics | 1976 | 1–0–0 1975 Roma ATH gold: javelin throw | |
| Ferdinando Meglio | FEN | Olympics | 1980—1992 | 1–1–2 1981 București FEN gold: sabre team; 1983 Edmonton FEN silver: sabre team; 1987 Zagreb FEN bronze: sabre and sabre team | |
| Jemal Megrelishvili | WRE | Olympics | 1972 | 1–0–0 1973 Moskva WRE gold: Greco-Roman featherweight -62 kg | |
| Məmmədəli Mehdiyev | JUD | Olympics | 2016—2020 | 0–0–1 2013 Kazan JUD bronze: half-middleweight -81 kg | |
| Annika Mehlhorn | SWM | Olympics | 2004 | 1–0–0 2009 Beograd SWI gold: 200 m butterfly | |
| Krzysztof Mehlich | ATH | Olympics | 1996 | 0–0–1 1995 Fukuoka ATH bronze: 110 m hurdles | |
| Stefano Mei | ATH | Olympics | 1984—1988 | 2–0–0 1985 Kobe ATH gold: 5000 m; 1989 Duisburg ATH gold: 5000 m | |
| Petra Meier-Felke | ATH | Olympics | 1988—1992 | 1–0–0 1981 București ATH gold: javelin throw (competed as Petra Felke for East Germany) | |
| Kersten Meier | SWM | Olympics | 1972 | 0–0–1 1973 Moskva SWI bronze: 4×100 m medley relay | |
| Maaris Meier | CRD | Olympics | 2004 | 0–1–0 2011 Shenzhen CYC silver: mountain biking | |
| Heike Meißner | ATH | Olympics | 1992—2000 | 2–0–0 1993 Buffalo ATH gold: 400 m hurdles; 1995 Fukuoka ATH gold: 400 m hurdles | |
| Doris Meister | SWM | Olympics | 1968 | 0–0–2 1973 Moskva SWI bronze: 4×100 m freestyle relay and 4×100 m medley relay | |
| Amadou Méité | ATH | Olympics | 1972—1976 | 0–1–0 1979 Ciudad de México ATH silver: 4×100 m relay | |
| Amel Mekić | JUD | Olympics / Opening Flagbearer / Closing Flagbearer | 2004—2012 | 0–0–1 2003 Daegu JUD bronze: half-heavyweight -100 kg | |
| Viktor Melantyev | CSP | Olympics | 2008—2020 | 3–0–0 2013 Kazan CAN gold: C2 200 m, C2 500 m, and C2 1000 m | |
| Yevgeny Meleshchenko | ATH | Olympics | 2004—2008 | 0–1–0 2001 Beijing ATH silver: 400 m hurdles | |
| Lori Melien | SWM | Olympics | 1988 | 0–1–0 1993 Buffalo SWI silver: 4×100 m freestyle relay | |
| Luis Felipe Méliz | ATH | Olympics | 2000—2012 | 0–1–0 1999 Palma de Mallorca ATH silver: long jump (competed for Cuba) | |
| Faina Melnik | ATH | Olympics | 1972—1980 | 1–0–1 1973 Moskva ATH gold: discus throw, bronze: shot put | |
| Boris Melnikov | FEN | Olympics | 1964 | 0–1–1 1963 Porto Alegre FEN silver: sabre team, bronze: sabre | |
| Nikolay Melnikov | WPO | Olympics | 1972—1976 | 2–0–0 1970 Torino WAP gold; 1973 Moskva WAP gold | |
| Hanna Melnychenko-Kasianova | ATH | Olympics | 2008—2016 | 0–0–1 2007 Bangkok ATH bronze: heptathlon | |
| Tetiana Melnyk | ATH | Olympics | 2016—2024 | 1–0–0 2019 Napoli ATH gold: 4×400 m relay | |
| Refik Memišević | WRE | Olympics | 1980—1984 | 0–1–0 1981 București WRE silver: Greco-Roman super-heavyweight +100 kg | |
| Jesús Mena | DIV | Olympics / Opening Flagbearer | 1988—1992 | 0–1–0 1991 Sheffield DIV silver: platform | |
| Kata Menczinger | WPO | Olympics | 2012 | 0–2–0 2009 Beograd WAP silver; 2017 Taipei WAP silver | |
| Tamás Mendelényi | FEN | Olympics | 1960 | 2–0–0 1959 Torino FEN gold: sabre team; 1961 Sofia FEN gold: sabre team | |
| Carolina Mendoza | DIV | Olympics | 2012—2020 | 1–1–1 2019 Napoli DIV gold: synchronized springboard, silver: team, bronze: mixed synchronized springboard | |
| Nurlan Mendygaliyev | WPO | Olympics | 1988 | 1–0–0 1985 Kobe WAP gold | |
| Ana Menéndez | ATH | Olympics | 1996 | 0–0–1 1999 Palma de Mallorca ATH bronze: 1500 m | |
| Osleidys Menéndez | ATH | Olympics / Closing Flagbearer | 2000—2008 | 1–0–0 2001 Beijing ATH gold: javelin throw | |
| Ronald Menezes | SWM | Olympics | 1984 | 0–0–1 1981 București SWI bronze: 4×100 m freestyle relay | |
| Sérgio de Menezes | ATH | Olympics | 1988—1992 | 0–1–0 1989 Duisburg ATH silver: 400 m | |
| Meng Jie | FEN | Olympics | 2000—2004 | 2–1–0 2001 Beijing FEN gold: foil team, silver: foil; 2003 Daegu FEN gold: foil team | |
| Meng Kebate'er | BKB | Olympics | 1996—2004 | 0–1–0 2001 Beijing BAS silver | |
| Argentina Menis | ATH | Olympics | 1972—1976 | 0–2–0 1973 Moskva ATH silver: discus throw; 1975 Roma ATH silver: discus throw | |
| Carol Menken-Schaudt | BKB | Olympics | 1984 | 1–1–0 1981 București BAS silver (competed as Carol Menken); 1983 Edmonton BAS gold | |
| Aleksandr Menkov | ATH | Olympics | 2012 | 0–1–0 2013 Kazan ATH silver: long jump | |
| Pietro Mennea | ATH | Olympics / Opening Flagbearer | 1972—1988 | 5–0–2 1973 Moskva ATH gold: 200 m, bronze: 100 m and 4×100 m relay; 1975 Roma ATH gold: 100 m and 200 m; 1979 Ciudad de México ATH gold: 200 m and 4×100 m relay | |
| Emanuele Merisi | SWM | Olympics | 1992—2004 | 1–2–1 1993 Buffalo SWI silver: 200 m backstroke, bronze: 100 m backstroke; 1997 Catania SWI gold: 200 m backstroke, silver: 4×100 m medley relay | |
| Reinhard Merkel | SWM | Olympics | 1968 | 0–0–1 1970 Torino SWI bronze: 400 m medley | |
| Aleksandra Merkulova | GRY | YOG | 2010 | 1–2–0 2013 Kazan RGY gold: ball, silver: all-around and ribbon | |
| Iryna Merleni-Mykulchyn | WRE | Olympics | 2004—2012 | 1–0–0 2005 İzmir WRE gold: freestyle featherweight -51 kg (competed as Iryna Merleni) | |
| Ken Merten | SWM | Olympics | 1968 | 3–0–0 1967 Tokyo SWI gold: 100 m breaststroke, 200 m breaststroke, and 4×100 m medley relay | |
| Leila Meskhi | TEN | Olympics | 1988—1992 | 2–1–0 1987 Zagreb TEN gold: singles and doubles, silver: mixed doubles | |
| Romain Mesnil | ATH | Olympics | 2000—2012 | 0–0–1 1999 Palma de Mallorca ATH bronze: pole vault | |
| Mónica Messa | BKB | Olympics | 1992 | 0–1–0 1991 Sheffield BAS silver | |
| Dayaris Mestre | JUD | Olympics | 2012—2016 | 0–0–1 2013 Kazan JUD bronze: extra-lightweight -48 kg | |
| Miklós Meszéna | FEN | Olympics | 1964—1968 | 4–0–0 1961 Sofia FEN gold: sabre team; 1963 Porto Alegre FEN gold: sabre team; 1965 Budapest FEN gold: sabre and sabre team | |
| Adrian Metcalfe | ATH | Olympics | 1964 | 2–0–0 1963 Porto Alegre ATH gold: 400 m and 4×400 m relay | |
| Linda Metheny | GAR | Olympics | 1964—1972 | 0–2–0 1967 Tokyo GYM silver: all-around and team | |
| Gert Metz | ATH | Olympics | 1968 | 1–0–0 1965 Budapest ATH gold: 4×100 m relay | |
| Darren Mew | SWM | Olympics | 2000—2004 | 0–0–1 2007 Bangkok SWI bronze: 50 m breaststroke | |
| Gabrielle Meyer | ATH | Olympics | 1968 | 2–1–0 1967 Tokyo ATH gold: 200 m and 4×100 m relay, silver: 100 m | |
| Ann Meyers | BKB | Olympics | 1976 | 0–1–0 1977 Sofia BAS silver | |
| Ulrike Meyfarth | ATH | Olympics / Closing Flagbearer | 1972—1984 | 0–1–0 1979 Ciudad de México ATH silver: high jump | |
| Anne Meygret | FEN | Olympics | 1984 | 0–0–1 1983 Edmonton FEN bronze: foil team | |
| Ruslan Mezentsev | GAR | Olympics | 2000—2004 | 0–1–0 2003 Daegu GYM silver: team | |
| Miao Bo | BKB | Olympics | 1996 | 0–1–0 2001 Beijing BAS silver | |
| Miao Lijie | BKB | Olympics | 2004—2012 | 1–1–0 2001 Beijing BAS silver; 2003 Daegu BAS gold | |
| Giovanni Miccoli | ROW | Olympics | 1988 | 0–1–0 1987 Zagreb ROW silver: coxed fours | |
| Łukasz Michalski | ATH | Olympics | 2012 | 1–0–0 2011 Shenzhen ATH gold: pole vault | |
| Angelina Michshuk | SHO | Olympics | 2012 | 0–0–2 2013 Kazan SHO bronze: skeet team; 2015 Gwangju SHO bronze: skeet team | |
| Igors Miglinieks | BKB | Olympics | 1988—1992 | 0–1–0 1989 Duisburg BAS silver (competed for the Soviet Union) | |
| Ambra Migliori | SWM | Olympics | 2004 | 0–0–1 2009 Beograd SWI bronze: 4×200 m freestyle relay | |
| Aurélio Miguel | JUD | Olympics / Opening Flagbearer | 1988—1996 | 0–1–1 1985 Kobe JUD silver: half-heavyweight -95 kg, bronze: open class | |
| Yelena Migunova | ATH | Olympics | 2008 | 2–1–0 2005 İzmir ATH gold: 4×400 m relay; 2011 Shenzhen ATH gold: 4×400 m relay, silver: 400 m | |
| Bogdan Mihăilescu | WPO | Olympics | 1972 | 0–0–1 1965 Budapest WAP bronze | |
| László Mihályfi | ATH | Olympics | 1964 | 2–1–1 1961 Sofia ATH gold: 200 m, bronze: 100 m; 1963 Porto Alegre ATH gold: 4×100 m relay; 1965 Budapest ATH silver: 4×400 m relay | |
| Miloš Mijalković | JUD | Olympics | 2004 | 0–0–1 2001 Beijing JUD bronze: half-lightweight -66 kg (competed for FR Yugoslavia) | |
| Damir Mikec | SHO | Olympics / Closing Flagbearer | 2008—2024 | 0–1–0 2011 Shenzhen SHO silver: 50 m free pistol | |
| Dmytro Mikhai | ROW | Olympics | 2012—2016 | 0–2–0 2013 Kazan ROW silver: eights; 2015 Gwangju ROW silver: eights | |
| Viktor Mikhalchuk | VVO | Olympics | 1968 | 1–1–0 1965 Budapest VOL gold; 1970 Torino VOL silver | |
| Aleksandr Mikhaylin | JUD | Olympics | 2012 | 0–1–0 2001 Beijing JUD silver: heavyweight +100 kg | |
| Anatoly Mikhaylov | ATH | Olympics | 1956—1964 | 2–0–0 1961 Sofia ATH gold: 4×100 m relay; 1963 Porto Alegre ATH gold: 110 m hurdles | |
| Vladimir Mikheyev | SWM | Olympics | 1976 | 0–3–0 1977 Sofia SWI silver: 400 m freestyle and 4×200 m freestyle relay; 1979 Ciudad de México SWI silver: 400 m medley | |
| Andrei Mikhnievich | ATH | Olympics | 2000—2012 | 1–0–0 2003 Daegu ATH gold: shot put | |
| Esko Mikkola | ATH | Olympics | 2004 | 0–1–0 2003 Daegu ATH silver: javelin throw | |
| Paolo Milanoli | FEN | Olympics | 2000 | 0–1–1 1993 Buffalo FEN bronze: épée team; 1995 Fukuoka FEN silver: épée | |
| Philip Milanov | ATH | Olympics | 2016—2024 | 1–0–0 2015 Gwangju ATH gold: discus throw | |
| Igor Milanović | WPO | Olympics / Opening Flagbearer | 1984—1996 | 0–0–2 1987 Zagreb WAP bronze; 2011 Shenzhen WAP bronze | |
| Joel Milburn | ATH | Olympics | 2008 | 0–1–0 2007 Bangkok ATH silver: 4×400 m relay | |
| Jearl Miles-Clark | ATH | Olympics | 1992—2004 | 1–1–0 1989 Duisburg ATH gold: 4×400 m relay, silver: 400 m (competed as Jearl Miles) | |
| Kostiantyn Miliaiev | DIV | Olympics | 2008 | 1–1–0 2009 Beograd DIV gold: platform; 2011 Shenzhen DIV silver: team | |
| Mitar Milinković | JUD | Olympics | 1992—1996 | 0–1–0 1995 Fukuoka JUD silver: heavyweight +95 kg (competed for FR Yugoslavia) | |
| Alina Militaru | ATH | Olympics | 2004 | 0–1–0 2003 Daegu ATH silver: long jump | |
| Billy Miller | WPO | Olympics | 2012 | 1–0–0 2009 Beograd WAP gold | |
| Coby Miller | ATH | Olympics | 2000—2004 | 2–0–0 1999 Palma de Mallorca ATH gold: 200 m and 4×100 m relay | |
| Cody Miller | SWM | Olympics | 2016 | 0–0–1 2013 Kazan SWI bronze: 4×100 m medley relay (swam in heats only) | |
| Craig Miller | WPO | Olympics | 2000—2004 | 0–0–2 1995 Fukuoka WAP bronze; 1997 Catania WAP bronze | |
| Inger Miller | ATH | Olympics | 1996 | 1–0–0 1995 Fukuoka ATH gold: 4×100 m relay | |
| Shannon Miller | GAR | Olympics | 1992—1996 | 1–1–0 1997 Catania GYM gold: all-around, silver: team | |
| Alice Mills | SWM | Olympics | 2004—2008 | 1–0–4 2007 Bangkok SWI bronze: 100 m freestyle and 50 m breaststroke; 2011 Shenzhen SWI gold: 4×100 m freestyle relay, bronze: 50 m butterfly and 100 m butterfly | |
| Noam Mills | FEN | Olympics | 2008 | 0–1–0 2007 Bangkok FEN silver: épée | |
| Bojana Milošević | BKB | Olympics | 1988 | 1–0–1 1985 Kobe BAS bronze; 1987 Zagreb BAS gold | |
| DeLisha Milton-Jones | BKB | Olympics | 2000—2008 | 1–0–0 1997 Catania BAS gold | |
| Saša Mimić | ROW | Olympics | 1980 | 0–0–1 1987 Zagreb ROW bronze: eights | |
| Florin Mina | VVO | Non-starter | 1980 | 1–0–0 1981 București VOL gold | |
| Katsuyuki Minami | VVO | Olympics | 1992 | 1–0–0 1993 Buffalo VOL gold | |
| Gor Minasyan | WLF | Olympics / YOG | 2010—2024 | 1–0–0 2017 Taipei WLT gold: super-heavyweight -105 kg | |
| Ildikó Mincza-Nébald | FEN | Olympics | 1992—2008 | 3–1–1 1993 Buffalo FEN gold: foil (competed as Ildikó Mincza); 1995 Fukuoka FEN silver: foil (competed as Ildikó Mincza); 1997 Catania FEN gold: foil team and épée team, bronze: foil (competed as Ildikó Mincza) | |
| Sergey Mindirgasov | FEN | Olympics | 1988 | 3–0–0 1983 Edmonton FEN gold: sabre team; 1985 Kobe FEN gold: sabre and sabre team | |
| Gianni Minervini | SWM | Olympics | 1984—1992 | 0–1–0 1985 Kobe SWI silver: 100 m breaststroke | |
| Viktor Minibayev | DIV | Olympics | 2012—2020 | 1–4–2 2011 Shenzhen DIV silver: platform and synchronized platform, bronze: team; 2013 Kazan DIV silver: synchronized platform and team, bronze: platform; 2017 Taipei DIV gold: team | |
| Dominick Minicucci, Jr. | GAR | Olympics | 1988—1992 | 0–0–1 1991 Sheffield GYM bronze: pommelled horse | |
| Irina Minkh | BKB | Olympics | 1988—1992 | 1–0–0 1985 Kobe BAS gold | |
| Yu Minobe | GAR | Olympics | 2008—2012 | 4–2–0 2011 Shenzhen GYM gold: uneven bars, balance beam, and team; 2013 Kazan GYM silver: team; 2015 Gwangju GYM gold: balance beam, silver: team | |
| Ildar Minshin | ATH | Olympics | 2008 | 0–0–1 2011 Shenzhen ATH bronze: 3000 m steeplechase | |
| Sašo Mirjanič | ROW | Olympics | 1988—1992 | 0–0–1 1987 Zagreb ROW bronze: eights (competed for Yugoslavia) | |
| Victor Mirshawka | BKB | Olympics | 1964 | 1–0–0 1963 Porto Alegre BAS gold | |
| Alfio Misaggi | WPO | Olympics | 1980—1988 | 1–0–0 1987 Zagreb WAP gold | |
| Valentina Mishak | VVO | Olympics | 1964 | 3–0–0 1961 Sofia VOL gold (competed as Valentyna Voloshchuk); 1965 Budapest VOL gold; 1970 Torino VOL gold | |
| Hanna Mishchenko | ATH | Olympics | 2008—2012 | 1–0–0 2011 Shenzhen ATH gold: 1500 m | |
| Saša Mišić | WPO | Olympics | 2016 | 0–0–1 2011 Shenzhen WAP bronze | |
| Arsens Miskarovs | SWM | Olympics | 1980 | 2–0–1 1981 București SWI gold: 200 m breaststroke and 4×100 m medley relay, bronze: 100 m breaststroke | |
| Michele Mitchell | DIV | Olympics | 1984—1988 | 0–1–0 1985 Kobe DIV silver: platform | |
| Morgan Mitchell | ATH | Olympics | 2016—2020 | 0–0–1 2019 Napoli ATH bronze: 4×400 m relay | |
| Victoria Mitchell | ATH | Olympics | 2008—2016 | 0–1–0 2005 İzmir ATH silver: 3000 m steeplechase | |
| Silviya Miteva | GRY | Olympics | 2012 | 0–0–1 2013 Kazan RGY bronze: ribbon | |
| Branislav Mitrović | WPO | Olympics | 2016—2020 | 1–0–1 2009 Beograd WAP bronze; 2011 Shenzhen WAP gold | |
| Aki Mitsuhashi | HOC | Olympics | 2012—2020 | 0–0–1 2013 Kazan HOK bronze | |
| Eizaburo Mitsuhashi | VVO | Olympics | 1984—1988 | 0–0–2 1979 Ciudad de México VOL bronze; 1981 București VOL bronze | |
| Risako Mitsui | SWA | Olympics | 2012—2016 | 0–3–0 2013 Kazan SYN silver: duet, team, and team Free Routine Combination | |
| Takashi Mitsukuri | GAR | Olympics | 1960—1964 | 1–0–0 1961 Sofia GYM gold: all-around | |
| Yasuaki Mitsumori | VVO | Olympics | 1968 | 1–0–0 1967 Tokyo VOL gold | |
| Yuko Mitsuya | VVO | Olympics | 1984 | 0–1–0 1991 Ciudad de México VOL silver | |
| Hanako Miura | GAR | Olympics | 1992—1996 | 0–0–1 1993 Buffalo GYM bronze: team | |
| Nobuyoshi Miura | ATH | Olympics | 1968 | 0–0–1 1967 Tokyo ATH bronze: 3000 m steeplechase | |
| Rina Miura | GRY | Non-starter | 2012 | 0–3–1 2013 Kazan RGY silver: group 10 clubs and group 3 balls + 2 ribbons, bronze: group all-around; 2015 Gwangju RGY silver: group 6 clubs + 2 hoops | |
| Junichi Miyashita | SWM | Olympics | 2008 | 0–0–1 2005 İzmir SWI bronze: 100 m backstroke | |
| Takiri Miyazaki | DIV | Olympics | 2004 | 0–0–1 2001 Beijing DIV bronze: synchronized platform | |
| Koichi Mizushima | GAR | Olympics | 1988 | 0–0–1 1987 Zagreb GYM bronze: team | |
| Jun Mizutani | TTE | Olympics | 2008—2020 | 0–0–1 2009 Beograd TTN bronze: team | |
| Hisashi Mizutori | GAR | Olympics | 2004 | 3–2–0 2001 Beijing GYM silver: team; 2007 Bangkok GYM gold: all-around, horizontal bar, and team, silver: floor | |
| Gülcan Mıngır | ATH | Olympics | 2012 | 0–0–1 2013 Kazan ATH bronze: 3000 m steeplechase | |
| Mo Ke | BKB | Olympics | 2004 | 0–1–0 2001 Beijing BAS silver | |
| Sławomir Mocek | FEN | Olympics | 2000—2008 | 0–1–1 1999 Palma de Mallorca FEN silver: foil team, bronze: foil | |
| Sachi Mochida | SWM | Olympics | 2016 | 0–1–1 2019 Napoli SWI silver: 4×100 m freestyle relay, bronze: 200 m butterfly | |
| Vincenzo Modica | ATH | Olympics | 2000 | 0–0–1 1993 Buffalo ATH bronze: 10000 m | |
| John Moffet | SWM | Olympics | 1984 | 3–0–0 1985 Kobe SWI gold: 100 m breaststroke, 200 m breaststroke, and 4×100 m medley relay | |
| Ehsan Mohajer Shojaei | ATH | Olympics | 2008 | 1–0–0 2007 Bangkok ATH gold: 800 m | |
| Aida Mohamed | FEN | Olympics / Opening Flagbearer | 1996—2020 | 1–1–0 1997 Catania FEN gold: foil team; 1999 Palma de Mallorca FEN silver: foil | |
| Tino Mohaupt | SHO | Olympics | 2008—2012 | 2–0–1 2007 Bangkok SHO gold: 10 m air rifle and 50 m rifle prone team, bronze: 10 m air rifle team | |
| Ihor Mohylnyi | ROW | Olympics | 1992—1996 | 1–0–0 1993 Buffalo ROW gold: quadruple sculls (competed for Ukraine) | |
| Mok Un-Ju | GAR | Olympics | 2000 | 0–0–1 2001 Beijing GYM bronze: team | |
| Stephen Mokoka | ATH | Olympics | 2012—2024 | 2–2–1 2007 Bangkok ATH bronze: 10000 m; 2011 Shenzhen ATH silver: 10000 m; 2013 Kazan ATH gold: 10000 m and half marathon team, silver: half marathon | |
| Ilya Mokretsov | FEN | Olympics | 2016 | 1–0–0 2005 İzmir FEN gold: sabre team (competed for Russia) | |
| Markéta Mokrošová | BKB | Olympics | 2008 | 0–0–1 2001 Beijing BAS bronze | |
| Maksim Mokrousov | BOB | Olympics | 2014 | 1–0–0 2009 Beograd ATH gold: 4×100 m relay | |
| Yury Molchan | FEN | Olympics | 2004 | 0–0–3 2003 Daegu FEN bronze: foil team; 2005 İzmir FEN bronze: foil and foil team | |
| Marcela Moldovan-Zsak | FEN | Olympics | 1976—1984 | 1–2–0 1977 Sofia FEN silver: foil team (competed as Marcela Moldovan); 1981 București FEN gold: foil team (competed as Marcela Moldovan); 1983 Edmonton FEN silver: foil team (competed as Marcela Zsak) | |
| Nikolina Moldovan | CSP | Olympics | 2012—2016 | 0–1–2 2013 Kazan CAN silver: K2 200 m, bronze: K1 200 m and K2 500 m | |
| Olivera Moldovan | CSP | Olympics | 2012—2016 | 0–1–1 2013 Kazan CAN silver: K2 200 m, bronze: K2 500 m | |
| Valter Molea | ROW | Olympics | 1988—2000 | 1–0–0 1987 Zagreb ROW gold: eights | |
| Carlo Molfetta | TKW | Olympics | 2004—2012 | 1–0–0 2003 Daegu TKW gold: lightweight -72 kg | |
| Fabíola Molina | SWM | Olympics | 2000—2012 | 0–1–0 1997 Catania SWI silver: 100 m backstroke | |
| Juan Manuel Molina | ATH | Olympics | 2004—2008 | 1–1–0 2001 Beijing ATH silver: 20 km walk; 2005 İzmir ATH gold: 20 km walk | |
| Lyuba Mollova | ATH | Olympics | 1972 | 0–0–1 1973 Moskva ATH bronze: javelin throw | |
| Endre Molnár | WPO | Olympics | 1968—1980 | 0–0–1 1970 Torino WAP bronze | |
| Gyula Molnár | WRE | Olympics | 1980 | 0–1–0 1973 Moskva WRE silver: Greco-Roman bantamweight -57 kg | |
| István Molnár | VVO | Olympics | 1964 | 0–1–0 1965 Budapest VOL silver | |
| Tamás Molnár | WPO | Olympics | 2000—2008 | 0–1–0 1995 Fukuoka WAP silver | |
| José Luis Moltó | VVO | Olympics | 2000 | 0–1–0 1995 Fukuoka VOL silver | |
| Anne-Sophie Mondière | JUD | Olympics | 2008—2012 | 1–0–1 1999 Palma de Mallorca JUD gold: team; 2001 Beijing JUD bronze: open class | |
| Dan Money | BOB | Olympics | 2010 | 0–0–1 1997 Catania ATH bronze: 4×100 m relay | |
| Aurore Mongel | SWM | Olympics | 2004—2008 | 1–0–0 2003 Daegu SWI gold: 4×100 m freestyle relay | |
| Mönkhbaataryn Bundmaa | JUD | Olympics | 2008—2012 | 1–0–0 2007 Bangkok JUD gold: half-lightweight -52 kg | |
| Mönkhbatyn Urantsetseg | JUD | Olympics | 2012—2020 | 0–1–1 2009 Beograd JUD silver: extra-lightweight -48 kg; 2015 Gwangju JUD bronze: extra-lightweight -48 kg | |
| Jérémy Monnier | SHO | Olympics | 2012—2016 | 0–1–0 2011 Shenzhen SHO silver: 50 m rifle three positions team | |
| Yasunori Mononobe | SWM | Olympics | 2008 | 1–0–0 2009 Beograd SWI gold: 4×200 m freestyle relay | |
| Attila Monostori | WPO | Olympics | 1996 | 0–1–0 1997 Catania WAP silver | |
| Niurka Montalvo | ATH | Olympics | 1996—2004 | 1–0–0 1993 Buffalo ATH gold: triple jump (competed for Cuba) | |
| Carlo Montano | FEN | Olympics | 1972—1976 | 0–1–1 1977 Sofia FEN bronze: foil team; 1979 Ciudad de México FEN silver: foil team | |
| Mario Aldo Montano | FEN | Olympics | 1972—1980 | 0–0–1 1970 Torino FEN bronze: sabre team | |
| Mario Tullio Montano | FEN | Olympics / Referee | 1972—1988 | 1–0–2 1967 Tokyo FEN gold: sabre team, bronze: sabre; 1970 Torino FEN bronze: sabre team | |
| Noelle Montcalm | ATH | Olympics | 2016—2020 | 0–1–0 2013 Kazan ATH silver: 4×400 m relay | |
| Manuèla Montebrun | ATH | Olympics | 2000—2008 | 1–0–1 1999 Palma de Mallorca ATH bronze: hammer throw; 2001 Beijing ATH gold: hammer throw | |
| Pablo Montes | ATH | Olympics / Non-starter | 1968—1976 | 0–1–0 1970 Torino ATH silver: 4×100 m relay | |
| Anne Montminy | DIV | Olympics | 1992—2000 | 1–1–1 1993 Buffalo DIV gold: platform, silver: team; 1999 Palma de Mallorca DIV bronze: platform | |
| Roberto Monzón | WRE | Olympics | 2004—2008 | 0–0–1 2005 İzmir WRE bronze: Greco-Roman lightweight -60 kg | |
| Hannah Moore | SWM | YOG | 2014 | 0–0–1 2017 Taipei SWI bronze: 1500 m freestyle | |
| Kendis Moore | SWM | Olympics | 1968 | 2–0–0 1967 Tokyo SWI gold: 100 m backstroke and 4×100 m medley relay | |
| Maya Moore | BKB | Olympics | 2012—2016 | 1–0–0 2009 Beograd BAS gold | |
| Jeroen Mooren | JUD | Olympics | 2012—2016 | 1–0–0 2009 Beograd JUD gold: extra-lightweight -60 kg | |
| Sajjad Moradi | ATH | Olympics | 2004—2012 | 1–0–0 2009 Beograd ATH gold: 800 m | |
| Salvatore Morale | ATH | Olympics / Non-starter | 1960—1972 | 2–0–1 1959 Torino ATH gold: 400 m hurdles; 1961 Sofia ATH gold: 400 m hurdles; 1963 Porto Alegre ATH bronze: 400 m hurdles | |
| Juan Morales | ATH | Olympics | 1968—1972 | 0–1–0 1970 Torino ATH silver: 4×100 m relay | |
| Matteo Morandi | GAR | Olympics | 2004—2012 | 0–0–1 2005 İzmir GYM bronze: rings | |
| Martina Moravčíková | SWM | Olympics | 2012—2016 | 0–0–1 2015 Gwangju SWI bronze: 200 m breaststroke | |
| Martina Moravcová | SWM | Olympics | 1992—2008 | 5–0–1 1995 Fukuoka SWI gold: 100 m freestyle, bronze: 200 m medley (competed for Slovakia); 1997 Catania SWI gold: 100 m freestyle, 200 m freestyle, 100 m butterfly, and 200 m medley (competed for Slovakia) | |
| Roman Moravec | ATH | Olympics | 1972 | 0–0–1 1973 Moskva ATH bronze: high jump | |
| Abderrahmane Morceli | ATH | Olympics | 1980—1984 | 0–0–1 1977 Sofia ATH bronze: 1500 m | |
| Sara Moreira | ATH | Olympics | 2008—2020 | 2–1–0 2009 Beograd ATH gold: 5000 m and 3000 m steeplechase; 2011 Shenzhen ATH silver: 5000 m | |
| Yipsi Moreno | ATH | Olympics | 2000—2012 | 0–1–0 2001 Beijing ATH silver: hammer throw | |
| María Moret | BKB | Olympics | 1980 | 0–1–0 1979 Ciudad de México BAS silver | |
| Keith Morgan | JUD | Olympics | 1996—2008 | 1–0–0 1999 Palma de Mallorca JUD gold: middleweight -90 kg | |
| Nina Morgunova | ATH | Olympics | 1972 | 1–0–0 1975 Roma ATH gold: 800 m |