Host cities:
| Athlete | Nation(s) | Sport(s) | Role(s) | Era | Notes |
|---|---|---|---|---|---|
| Gianluca Maglia | ITA |
SWM | Olympics | 2012 | 0–0–1 2013 Kazan SWI bronze: 4×100 m freestyle relay |
| Margherita Magnani | ITA |
ATH | Olympics | 2016 | 0–0–1 2013 Kazan ATH bronze: 1500 m |
| Seyfula Magomedov | RUS |
TKW | Olympics | 2004 | 1–0–0 2005 İzmir TKW gold: finweight -54 kg |
| Zoltán Magyar | HUN |
GAR | Olympics | 1972—1980 | 1–0–1 1977 Sofia GYM gold: pommelled horse; 1979 Ciudad de México GYM bronze: pommelled horse |
| Emily Maher | IRL |
ATH | Olympics | 2000 | 0–0–1 2005 İzmir ATH bronze: 4×100 m relay |
| Nitya Krishinda Maheswari | INA |
BDM | Olympics | 2016 | 0–0–1 2007 Bangkok BDM bronze: team |
| Travis Mahoney | AUS |
SWM | Olympics | 2016 | 0–1–0 2015 Gwangju SWI silver: 4×200 m freestyle relay |
| Atlee Mahorn | CAN |
ATH | Olympics | 1984—1992 | 0–2–0 1985 Kobe ATH silver: 200 m and 4×100 m relay |
| Sandrine Mainville | CAN |
SWM | Olympics | 2016 | 0–0–1 2013 Kazan SWI bronze: 4×100 m freestyle relay |
| Robert Maitland | AUS |
WPO | Olympics | 2008 | 1–0–1 2003 Daegu WAP bronze; 2009 Beograd WAP gold |
| Kacper Majchrzak | POL |
SWM | Olympics | 2012—2020 | 0–2–0 2017 Taipei SWI silver: 100 m freestyle and 200 m freestyle |
| Tomasz Majewski | POL |
ATH | Olympics / Other | 2004—2016 | 1–0–0 2005 İzmir ATH gold: shot put |
| István Major | HUN |
ATH | Olympics | 1972—1976 | 0–2–0 1973 Moskva ATH silver: high jump; 1975 Roma ATH silver: high jump |
| Biljana Majstorović | SRB YUG |
BKB | Olympics | 1980—1984 | 0–0–2 1983 Edmonton BAS bronze; 1985 Kobe BAS bronze |
| Ihar Makarau | BLR |
JUD | Olympics / Other | 2004—2012 | 0–0–1 2001 Beijing JUD bronze: open class |
| Yekaterina Makarova | RUS |
TEN | Olympics | 2012—2016 | 2–0–0 2009 Beograd TEN gold: doubles and team |
| Katalin Makray-Schmitt | HUN |
GAR | Olympics | 1964—1968 | 3–0–1 1963 Porto Alegre GYM gold: all-around and team (competed as Katalin Makray); 1965 Budapest GYM gold: team, bronze: all-around |
| Anastasiya Maksimova | ROC RUS |
GRY | Olympics | 2016—2020 | 3–0–0 2013 Kazan RGY gold: group all-around, group 10 clubs, and group 3 balls + 2 ribbons |
| Ivana Maksimović-Anđušić | SRB |
SHO | Olympics / Other | 2012—2016 | 0–1–1 2015 Gwangju SHO silver: 10 m air rifle team, bronze: 10 m air rifle |
| Valeriia Maksiuta | ISR |
GAR | Olympics | 2012 | 0–1–0 2005 İzmir GYM silver: vault (competed as Valeriya Maksyuta for Ukraine) |
| Alina Maksymenko | UKR |
GRY | Olympics | 2008—2012 | 0–2–2 2011 Shenzhen RGY silver: hoop, bronze: clubs; 2013 Kazan RGY silver: clubs, bronze: hoop |
| Bohdan Makuts | URS UKR |
GAR | Olympics / Referee | 1980—2016 | 6–0–1 1979 Ciudad de México GYM gold: all-around, horse vault, parallel bars, horizontal bar, pommelled horse, and team, bronze: floor |
| Aliaksandr Malashevich | BLR |
ATH | Olympics | 2004 | 0–0–1 2001 Beijing ATH bronze: discus throw |
| Sophie Malbranque | FRA |
ATH | Olympics | 1980 | 0–0–1 1981 București ATH bronze: 400 m |
| Tom Malchow | USA |
SWM | Olympics | 1996—2004 | 1–0–0 1995 Fukuoka SWI gold: 200 m butterfly |
| Galina Malchugina | RUS URS EUN |
ATH | Olympics | 1988—1996 | 1–1–0 1989 Duisburg ATH gold: 200 m, silver: 4×100 m relay (competed for the Soviet Union) |
| Doris Maletzki | GDR |
ATH | Olympics | 1976 | 0–0–1 1973 Moskva ATH bronze: 4×100 m relay |
| Bronisław Malinowski | POL |
ATH | Olympics | 1972—1980 | 1–0–0 1975 Roma ATH gold: 3000 m steeplechase |
| Stefano Malinverni | ITA |
ATH | Olympics | 1980 | 0–0–1 1979 Ciudad de México ATH bronze: 4×400 m relay |
| Auriane Mallo | FRA |
FEN | Olympics | 2016 | 1–0–0 2013 Kazan FEN gold: épée team |
| Karl Malone | USA |
BKB | Olympics | 1992—1996 | 0–0–1 1983 Edmonton BAS bronze |
| Maicel Malone | USA |
ATH | Olympics | 1996 | 3–0–0 1991 Sheffield ATH gold: 400 m and 4×400 m relay; 1993 Buffalo ATH gold: 4×400 m relay |
| Anna Malova-Podkopayeva | ROC RUS |
VVO | Olympics | 2016—2020 | 1–0–0 2013 Kazan VOL gold |
| Hanna Malyshchyk | BLR |
ATH | Olympics | 2016—2020 | 0–1–0 2017 Taipei ATH silver: hammer throw |
| Maryia Mamashuk | BLR |
WRE | Olympics | 2016 | 0–0–1 2013 Kazan WRE bronze: freestyle middleweight -63 kg |
| Nursultan Mamayev | KAZ |
TKW | Olympics / YOG | 2010—2012 | 1–0–1 2015 Gwangju TKW gold: flyweight -58 kg; 2017 Taipei TKW bronze: Kyorugi team |
| Patrícia Mamona | POR |
ATH | Olympics | 2012—2020 | 0–1–0 2011 Shenzhen ATH silver: triple jump |
| Margarita Mamun | RUS |
GRY | Olympics | 2016 | 4–0–0 2013 Kazan RGY gold: individual, clubs, hoop, and ribbon |
| Masayoshi Manabe | JPN |
VVO | Olympics / Coach | 1988—2016 | 1–0–0 1985 Kobe VOL gold |
| Viktor Manakov | RUS URS |
CTR | Olympics | 1980 | 1–1–0 1983 Edmonton CYC gold: 4000 m team pursuit, silver: 4000 m individual pursuit |
| Camilla Mancini | ITA |
FEN | YOG | 2010 | 2–0–1 2015 Gwangju FEN gold: foil team; 2019 Napoli gold: foil team, bronze: foil |
| Lenka Maňhalová | CZE TCH |
SWM | Olympics | 1992—1996 | 0–1–2 1995 Fukuoka SWI silver: 200 m medley (competed for the Czech Republic); 1997 Catania SWI bronze: 200 m breaststroke and 200 m medley (competed for the Czech Republic) |
| Tamara Manina | RUS URS |
GAR | Olympics | 1956—1964 | 0–0–1 1961 Sofia GYM bronze: all-around |
| Itzel Manjarrez | MEX |
TKW | Olympics | 2016 | 0–0–2 2011 Shenzhen TKW bronze: finweight -46 kg; 2017 Taipei TKW bronze: flyweight -49 kg |
| Peter Mankoč | SLO |
SWM | Olympics | 1996—2012 | 0–2–1 2001 Beijing SWI bronze: 200 m medley; 2003 Daegu SWI silver: 50 m freestyle and 200 m freestyle |
| Thompson Mann | USA |
SWM | Olympics | 1964 | 1–0–1 1965 Budapest SWI gold: 4×100 m medley relay, bronze: 200 m backstroke |
| Johanna Manninen | FIN |
ATH | Olympics | 1996—2004 | 2–0–0 2007 Bangkok ATH gold: 100 m and 4×100 m relay |
| Madeline Manning-Jackson | USA |
ATH | Olympics | 1968—1976 | 1–0–0 1967 Tokyo ATH gold: 800 m (competed as Madeline Manning) |
| Yukari Mano | JPN |
HOC | Olympics | 2016—2020 | 0–0–1 2013 Kazan HOK bronze |
| Maksim Manukyan | ARM |
WRE | Olympics | 2016 | 0–1–0 2013 Kazan WRE silver: Greco-Roman light-heavyweight -84 kg |
| Roberto Manzi | ITA |
FEN | Olympics | 1984 | 1–1–1 1983 Edmonton FEN gold: épée team; 1985 Kobe FEN silver: épée, bronze: épée team |
| Leaname Maotoanong | BOT |
ATH | Olympics | 2016 | 0–1–0 2015 Gwangju ATH silver: 400 m |
| Roxana Maracineanu | FRA |
SWM | Olympics | 2000 | 0–0–1 2001 Beijing SWI bronze: 200 m backstroke |
| José Marajo | FRA |
ATH | Olympics | 1976—1980 | 0–0–1 1977 Sofia ATH bronze: 800 m |
| Kazimierz Maranda | POL |
ATH | Olympics | 1972 | 0–0–1 1975 Roma ATH bronze: 3000 m steeplechase |
| Natalia Mărășescu | ROU |
ATH | Olympics | 1976—1980 | 2–2–0 1975 Roma ATH gold: 3000 m, silver: 1500 m (competed as Natalia Andrei); 1977 Sofia ATH silver: 1500 m; 1979 Ciudad de México ATH gold: 1500 m |
| Joe Marchal | USA |
JUD | Olympics | 1988 | 0–1–0 1985 Kobe JUD silver: half-lightweight -65 kg |
| Igor Marchenko | RUS |
SWM | Olympics | 2000—2004 | 0–0–2 2001 Beijing SWI bronze: 50 m butterfly and 100 m butterfly |
| Vladimir Marchenko | RUS URS |
GAR | Olympics | 1976 | 1–0–0 1973 Moskva GYM gold: team |
| José María de Marco | ESP |
ROW | Olympics | 1992—1996 | 0–0–1 1989 Duisburg ROW bronze: lightweight single sculls |
| Massimo Marconcini | ITA |
ROW | Olympics | 1992 | 1–0–0 1989 Duisburg ROW gold: eights |
| Cornel Mărculescu | ROU |
WPO | Olympics / Referee | 1964—1976 | 0–0–1 1965 Budapest WAP bronze |
| Ida Marcussen | NOR |
ATH | Olympics | 2008—2012 | 0–1–0 2015 Gwangju ATH silver: heptathlon |
| Igor Marenić | CRO |
SAL | Olympics | 2008—2016 | 1–0–0 2005 İzmir SAI gold: 470 men |
| Cyrille Maret | FRA |
JUD | Olympics | 2016 | 1–0–0 2009 Beograd JUD gold: half-heavyweight -100 kg |
| Melanie Margalis | USA |
SWM | Olympics | 2016 | 1–0–1 2013 Kazan SWI gold: 4×200 m freestyle relay (swam in heats only), bronze: 200 m medley |
| Serghei Marghiev | MDA |
ATH | Olympics | 2012—2020 | 0–0–1 2017 Taipei ATH bronze: hammer throw |
| Zalina Marghieva-Petrivskaya | MDA |
ATH | Olympics / Other | 2008—2020 | 1–0–1 2011 Shenzhen ATH gold: hammer throw; 2013 Kazan ATH bronze: hammer throw |
| Carolina Mariani | ARG |
JUD | Olympics / Other | 1992—2000 | 0–1–0 1999 Palma de Mallorca JUD silver: half-lightweight -52 kg |
| Bruno Marie-Rose | FRA |
ATH | Olympics | 1984—1992 | 0–0–1 1987 Zagreb ATH bronze: 100 m |
| Hanna Mariën | BEL |
ATH/BOB | Olympics / Other | 2008—2014 | 0–0–1 2007 Bangkok ATH bronze: 200 m |
| Christoph Marik | AUT |
FEN | Olympics | 2000—2004 | 1–0–2 1999 Palma de Mallorca FEN bronze: épée team; 2003 Daegu FEN bronze: épée; 2005 İzmir FEN gold: épée |
| Cornel Marin | ROU |
FEN | Olympics | 1976—1984 | 2–0–1 1977 Sofia FEN gold: sabre and sabre team; 1981 București FEN bronze: sabre team |
| Marco Marin | ITA |
FEN | Olympics | 1984—1992 | 1–2–1 1983 Edmonton FEN gold: sabre, silver: sabre team; 1985 Kobe FEN bronze: sabre team; 1991 Sheffield FEN silver: sabre team |
| Nikolay Marincheshki | BUL |
FEN | Olympics / Referee | 1980—1996 | 0–1–0 1985 Kobe FEN silver: sabre team |
| Tecla Marinescu-Borcănea | ROU |
CSP | Olympics | 1984 | 1–1–0 1987 Zagreb CAN gold: K4 500 m, silver: K1 500 m (competed as Tecla Borcanea) |
| Serghei Mariniuc | MDA EUN |
SWM | Olympics | 1992—2000 | 0–1–0 1987 Zagreb SWI silver: 400 m medley (competed for the Soviet Union) |
| Vladimir Markelov | RUS URS |
GAR | Olympics | 1976—1980 | 2–3–0 1977 Sofia GYM gold: horse vault and team, silver: all-around, horizontal bar, and rings |
| Viktor Markin | RUS URS |
ATH | Olympics | 1980 | 1–2–0 1981 București ATH gold: 4×400 m relay; 1983 Edmonton ATH silver: 400 m and 4×400 m relay |
| Anninos Markoullidis | CYP |
ATH | Olympics / Other | 1996—2004 | 0–0–1 1997 Catania ATH bronze: 200 m |
| Daniil Markov | RUS |
SWM | YOG | 2018 | 0–0–1 2019 Napoli SWI bronze: 50 m freestyle |
| Ilya Markov | RUS |
ATH | Olympics | 1996—2008 | 1–0–0 1997 Catania ATH gold: 20 km |
| Aleksey Markovsky | RUS URS |
SWM | Olympics | 1980 | 3–3–1 1981 București SWI silver: 200 m medley and 4×100 m freestyle relay; 1983 Edmonton SWI gold: 100 m butterfly, 4×100 m freestyle relay, and 4×100 m medley relay; 1985 Kobe SWI silver: 4×100 m medley relay, bronze: 4×100 m freestyle relay |
| Robert Marland | CAN |
ROW | Olympics | 1988—1992 | 0–0–1 1987 Zagreb ROW bronze: coxed fours |
| József Marosi | HUN |
FEN | Olympics | 1956—1960 | 0–1–1 1959 Torino FEN silver: foil team, bronze: épée team |
| Henadziy Maroz | BLR |
ATH | Olympics | 2004 | 0–2–0 2001 Beijing ATH silver: high jump; 2005 İzmir ATH silver: high jump |
| Gail Marquis | USA |
BKB | Olympics | 1976 | 0–1–0 1977 Sofia BAS silver |
| Daniel Marsden | AUS |
WPO | Olympics | 1992—2000 | 0–0–1 1995 Fukuoka WAP bronze |
| Ann Marsh | USA |
FEN | Olympics | 1992—2000 | 0–1–0 1999 Palma de Mallorca FEN silver: foil team |
| Mike Marsh | USA |
ATH | Olympics / Non-starter | 1988—1996 | 2–0–0 1987 Zagreb gold: 4×100 m relay (ran in heats only); 1989 Duisburg ATH gold: 4×100 m relay |
| John Marshall | USA |
ATH | Olympics | 1984 | 0–0–1 1985 Kobe ATH bronze: 800 m |
| Maritza Martén | CUB |
ATH | Olympics | 1992—1996 | 1–0–1 1985 Kobe ATH gold: discus throw; 1989 Duisburg ATH bronze: discus throw |
| Leszek Martewicz | POL |
FEN | Olympics | 1976 | 0–1–0 1977 Sofia FEN silver: foil team |
| Jaime Martí | ESP |
FEN | Olympics | 2008 | 0–1–2 1999 Palma de Mallorca FEN silver: sabre team; 2001 Beijing FEN bronze: sabre team; 2003 Daegu FEN bronze: sabre team |
| Anthony Martin | AUS |
WPO | Olympics | 2008 | 1–0–0 2009 Beograd WAP gold |
| David Martín | ESP |
WPO | Olympics / Coach | 2008—2020 | 1–0–0 1999 Palma de Mallorca WAP gold |
| Robert Martin | CAN |
ATH | Non-starter | 1976 | 0–2–0 1975 Roma ATH silver: 200 m and 4×100 m relay |
| Guillermo Martínez Luis | CUB |
WPO | Olympics | 1992 | 0–1–0 1987 Zagreb WAP silver |
| Gustavo Martínez | ESP |
SAL | Olympics | 2000—2004 | 0–1–0 1999 Palma de Mallorca SAI silver: 470 men |
| José Manuel Martínez | ESP |
ATH | Olympics | 2004—2008 | 1–0–0 1999 Palma de Mallorca ATH gold: 10000 m |
| Juan Martínez | CUB |
ATH | Olympics | 1992 | 0–0–1 1985 Kobe ATH bronze: discus throw |
| Lázaro Martínez | CUB |
ATH | Olympics | 1992 | 1–0–0 1985 Kobe ATH gold: 4×400 m relay |
| Luis Martínez | ESP |
SAL | Olympics | 2000—2004 | 0–1–0 1999 Palma de Mallorca SAI silver: Laser |
| Manuel Martínez | ESP |
ATH | Olympics | 1996—2008 | 1–0–0 2001 Beijing ATH gold: shot put |
| Yamilet Martínez | CUB |
BKB | Olympics | 1992—2000 | 0–2–0 1993 Buffalo BAS silver; 1997 Catania BAS silver |
| Yarianna Martínez | CUB |
ATH | Olympics | 2008 | 1–0–1 2007 Bangkok ATH bronze: triple jump, 2009 Beograd ATH gold: triple jump |
| Jean-François Di Martino | FRA |
FEN | Olympics | 1992—2000 | 0–0–1 1991 Sheffield FEN bronze: épée team |
| Filipa Martins | POR |
GAR | Olympics | 2016—2020 | 0–0–1 2015 Gwangju GYM bronze: balance beam |
| Henrique Martins | BRA |
SWM | Olympics | 2016 | 2–2–2 2011 Shenzhen SWI silver: 4×100 m freestyle relay; 2015 Gwangju SWI gold: 100 m freestyle and 50 m butterfly, silver: 50 m freestyle; 2017 Taipei SWI bronze: 50 m butterfly and 100 m butterfly |
| Armen Martirosyan | ARM |
ATH | Olympics | 1996—2004 | 0–1–0 1995 Fukuoka ATH silver: triple jump |
| Simon Martirosyan | ARM |
WLF | Olympics / YOG | 2014—2020 | 1–0–0 2017 Taipei WLT gold: heavyweight -105 kg |
| Anna Márton | HUN |
FEN | Olympics | 2016—2020 | 1–1–0 2017 Taipei FEN gold: sabre; silver: sabre team |
| Carmen Marton | AUS |
TKW | Olympics | 2008—2016 | 0–0–1 2011 Shenzhen TKW bronze: lightweight -62 kg |
| Caroline Marton | AUS |
TKW | Olympics | 2016 | 0–0–1 2007 Bangkok TKW bronze: welterweight -67 kg |
| Sebastián Martos | ESP |
ATH | Olympics | 2016—2020 | 0–1–0 2013 Kazan ATH silver: 3000 m steeplechase |
| Yana Martynova | RUS |
SWM | Olympics | 2004—2012 | 1–0–1 2013 Kazan SWI gold: 400 m medley, bronze: 200 m butterfly |
| Kei Marumo | JPN |
SWA | Olympics | 2016 | 0–2–0 2013 Kazan SYN silver: team and team Free Routine Combination |
| Mike Marx | USA |
FEN | Olympics | 1984—1996 | 0–1–0 1985 Kobe FEN silver: foil |
| Gioia Marzocca | ITA |
FEN | Olympics | 2004—2012 | 0–0–2 2001 Beijing FEN bronze: sabre and sabre team |
| Rolandas Maščinskas | LTU |
ROW | Olympics / YOG | 2010—2012 | 2–0–0 2013 Kazan ROW gold: double sculls; 2015 Gwangju ROW gold: souble dculls |
| Ruslan Mashchenko | RUS |
ATH | Olympics | 1996—2004 | 0–1–0 1997 Catania ATH silver: 400 m hurdles |
| Ruslan Mashurenko | UKR |
JUD | Olympics | 1996—2000 | 0–0–1 1999 Palma de Mallorca JUD bronze: team |
| Valentin Maslakov | BLR URS |
ATH | Olympics | 1968 | 0–0–1 1970 Torino ATH bronze: 4×100 m relay |
| Olha Maslivets | UKR |
SAL | Olympics | 2000—2012 | 0–0–1 2005 İzmir SAI bronze: Mistral women |
| Darya Maslova | KGZ |
ATH | Olympics | 2016—2020 | 1–0–1 2015 Gwangju ATH bronze: 5000 m; 2017 Taipei ATH gold: 10000 m |
| Mike Mason | CAN |
ATH | Olympics | 2008—2020 | 0–1–0 2009 Beograd ATH silver: high jump |
| Leonardo Massa | ITA |
ROW | Olympics | 1988 | 1–0–0 1987 Zagreb ROW gold: eights |
| Ali Massaoudi | ALG |
ATH | Olympics | 2016 | 0–0–1 2017 Taipei ATH bronze: 3000 m steeplechase |
| Kylie Masse | CAN |
SWM | Olympics | 2016—2020 | 1–0–0 2015 Gwangju SWI gold: 100 m backstroke |
| Kelly Massey | GBR |
ATH | Olympics | 2016 | 0–0–2 2007 Bangkok ATH bronze: 4×400 m relay; 2011 Shenzhen ATH bronze: 4×400 m relay |
| Anna Mastyanina | RUS |
SHO | Olympics | 2012 | 1–1–0 2013 Kazan SHO gold: 25 m sporting pistol team, silver: 25 m sporting pistol |
| Marisa Masullo | ITA |
ATH | Olympics | 1980—1988 | 0–1–1 1981 București ATH silver: 200 m, bronze: 4×100 m relay |
| Kamil Masztak | POL |
ATH | Olympics / Non-starter | 2008—2012 | 0–1–0 2009 Beograd ATH silver: 4×100 m relay |
| Bernardin Matam | FRA |
WLF | Olympics | 2012—2020 | 0–1–0 2013 Kazan WLT silver: lightweight -69 kg |
| Andrea Mátay | HUN |
ATH | Olympics | 1976—1980 | 1–0–0 1979 Ciudad de México ATH gold: high jump |
| Gábor Máté | HUN |
ATH | Olympics | 2000—2008 | 0–0–1 2005 İzmir ATH bronze: discus throw |
| Ilya Mate | URS UKR |
WRE | Olympics | 1980 | 1–0–0 1981 București WRE gold: freestyle heavyweight -100 kg |
| Nikolay Mateev | BUL |
FEN | Olympics | 1988 | 0–1–0 1985 Kobe FEN silver: sabre team |
| Ilie Matei | ROU |
WRE | Olympics | 1984 | 1–0–0 1981 București WRE gold: Greco-Roman light-heavyweight -90 kg |
| Sorin Matei | ROU |
ATH | Olympics | 1980—1992 | 0–0–1 1987 Zagreb ATH bronze: high jump |
| Randy Matson | USA |
ATH | Olympics | 1964—1968 | 1–0–0 1965 Budapest ATH gold: shot put |
| Takeshi Matsuda | JPN |
SWM | Olympics | 2004—2016 | 1–2–2 2003 Daegu SWI gold: 200 m butterfly; 2005 İzmir SWI silver: 4×200 m freestyle relay and 200 m butterfly, bronze: 400 m freestyle and 800 m freestyle |
| Miyuki Matsuhisa-Hironaka | JPN |
GAR | Olympics | 1968—1976 | 2–0–0 1967 Tokyo GYM gold: all-around and team |
| Yayoi Matsumoto | JPN |
SWM | Olympics | 2012—2016 | 0–1–1 2009 Beograd SWI silver: 4×100 m freestyle relay; 2011 Shenzhen SWI bronze: 4×100 m medley relay |
| Daisuke Matsunaga | JPN |
ATH | Olympics | 2016 | 0–0–1 2015 Gwangju ATH bronze: 20 km walk |
| Masayuki Matsunaga | JPN |
GAR | Olympics | 1992 | 0–3–1 1991 Sheffield GYM silver: parallel bars, horizontal bar, and team, bronze: all-around |
| Ami Matsuo | AUS |
SWM | YOG | 2014 | 0–0–1 2015 Gwangju SWI bronze: 100 m freestyle |
| Mina Matsushima | JPN |
SWM | Olympics | 2012 | 1–1–0 2015 Gwangju SWI gold: 100 m breaststroke, silver: 4×100 m medley relay |
| Yukihiro Matsushita | JPN |
SWM | Olympics | 1996 | 0–1–2 1993 Buffalo SWI bronze: 4×100 m medley relay; 1995 Fukuoka SWI silver: 4×100 m medley relay, bronze: 4×200 m freestyle relay |
| Adrien Mattenet | FRA |
TTE | Olympics | 2012 | 0–2–2 2009 Beograd TTN silver: doubles and team, bronze: singles; 2011 Shenzhen TTN bronze: team |
| Peter Matthews | JAM |
ATH | Olympics | 2016 | 0–1–0 2011 Shenzhen ATH silver: 400 m |
| Carlo Mattioli | ITA |
ATH | Olympics | 1984—1988 | 0–1–0 1981 București ATH silver: 20 km walk |
| Marcus Mattioli | BRA |
SWM | Olympics | 1980 | 0–0–2 1981 București SWI bronze: 4×100 m freestyle relay and 4×100 m medley relay |
| Mario Mattioli | ITA |
VVO | Olympics | 1976 | 1–0–0 1970 Torino VOL gold |
| Vasilijus Matuševas | LTU URS |
VVO | Olympics | 1968 | 0–1–0 1970 Torino VOL silver |
| Marek Matuszek | SVK |
JUD | Olympics | 1996—2000 | 0–1–0 1995 Fukuoka JUD silver: extra-lightweight -60 kg |
| Nadezhda Matyukhina | RUS URS |
SWM | Olympics | 1972 | 0–1–1 1973 Moskva SWI silver: 4×100 m freestyle relay, bronze: 400 m freestyle |
| Yelena Matyushenko | RUS URS |
DIV | Olympics | 1980 | 0–0–1 1981 București DIV bronze: platform |
| Maria Maunder | CAN |
ROW | Olympics | 1996 | 1–1–0 1993 Buffalo ROW gold: eights, silver: quadruple sculls |
| Antonio Maurogiovanni | ITA |
ROW | Olympics | 1988—1992 | 0–1–0 1987 Zagreb ROW silver: coxed fours |
| Umyar Mavlikhanov | RUS URS |
FEN | Olympics | 1960—1968 | 0–1–0 1965 Budapest FEN silver: sabre team |
| Fiona May | GBR ITA |
ATH | Olympics | 1988—2004 | 0–1–0 1991 Sheffield ATH silver: long jump (competed for Great Britain) |
| Anthuan Maybank | USA |
ATH | Olympics | 1996 | 2–0–0 1995 Fukuoka ATH gold: 200 m and 4×400 m relay |
| Gerhard Mayer | AUT |
ATH | Olympics | 2008—2012 | 1–0–0 2007 Bangkok ATH gold: discus throw |
| John Mayock | GBR |
ATH | Olympics | 1996—2004 | 1–0–0 1991 Sheffield ATH gold: 5000 m |
| Viktor Mazanov | RUS URS |
SWM | Olympics | 1964—1972 | 1–5–0 1965 Budapest SWI gold: 200 m backstroke, silver: 4×100 m freestyle relay, 4×200 m freestyle relay, and 4×100 m medley relay; 1970 Torino SWI silver: 4×100 m freestyle relay and 4×100 m medley relay |
| Viktoriya Mazur | UKR |
GRY | Olympics | 2012 | 0–1–2 2013 Kazan RGY silver: group all-around, bronze: group 10 clubs and group 3 balls + 2 ribbons |
| Hilda Mazúrová | TCH SVK |
VVO | Olympics | 1968—1972 | 0–0–1 1965 Budapest VOL bronze |
| Giorgio Mazza | ITA |
ATH | Olympics | 1964 | 1–1–1 1959 Torino ATH gold: 4×100 m realy, bronze: 110 m hurdles; 1963 Porto Alegre ATH silver: 110 m hurdles |
| Angelo Mazzoni | ITA |
FEN | Olympics | 1980—2000 | 1–0–1 1985 Kobe FEN bronze: épée team; 1989 Duisburg FEN gold: épée team |
| Massimiliano Mazzucchi | ITA |
DIV | Olympics | 2000—2004 | 0–0–1 2003 Daegu DIV bronze: synchronized springboard |
| Marnie McBean | CAN |
ROW | Olympics / Other | 1992—1996 | 1–2–0 1989 Duisburg ROW silver: coxless fours; 1993 Buffalo ROW gold: coxkess fours, silver: single sculls |
| Kirsten McCann | RSA |
ROW | Olympics | 2008—2016 | 1–0–0 2013 Kazan ROW gold: lightweight single sculls |
| Eliza McCartney | NZL |
ATH | Olympics | 2016 | 0–1–0 2015 Gwangju ATH silver: pole vault |
| Katrina McClain | USA |
BKB | Olympics | 1988—1996 | 0–1–0 1985 Kobe BAS silver |
| Caitlin McClatchey | GBR |
SWM | Olympics | 2004—2012 | 0–0–2 2013 Kazan SWI bronze: 200 m freestyle and 400 m freestyle |
| Lee McConnell | GBR |
ATH | Olympics | 2004—2012 | 0–1–1 1999 Palma de Mallorca ATH bronze: 4×400 m relay; 2001 Beijing ATH silver: 4×400 m relay |
| Suzie McConnell | USA |
BKB | Olympics | 1988—1992 | 1–0–0 1991 Sheffield BAS gold |
| Simon McCormack | AUS |
DIV | Olympics | 1992 | 0–0–1 1991 Sheffield DIV bronze: 1 m springboard |
| Walter McCoy | USA |
ATH | Olympics | 1984 | 1–2–1 1979 Ciudad de México ATH gold: 4×400 m relay, bronze: 400 m; 1981 București ATH silver: 400 m and 4×400 m relay |
| Danny McFarlane | JAM |
ATH | Olympics | 2000—2008 | 0–0–1 1993 Buffalo ATH bronze: 400 m |
| Bobby McGregor | GBR |
SWM | Olympics | 1964—1968 | 0–3–1 1967 Tokyo SWI silver: 100 m freestyle, 4×100 m freestyle relay, and 4×200 m freestyle relay, bronze: 4×100 m medley relay |
| Sam McGregor | AUS |
WPO | Olympics | 2004—2012 | 0–0–1 2003 Daegu WAP bronze |
| David McKeon | AUS |
SWM | Olympics | 2012—2016 | 1–0–1 2011 Shenzhen SWI gold: 400 m freestyle, bronze: 4×200 m freestyle relay |
| Jackie McKernan | GBR |
ATH | Olympics | 1988—1996 | 0–1–0 1993 Buffalo ATH silver: discus throw |
| David McKienzie | USA |
VVO | Olympics | 2012 | 1–0–0 2001 Beijing VOL gold |
| Kaila McKnight | AUS |
ATH | Olympics | 2012 | 0–1–0 2009 Beograd ATH silver: 1500 m |
| Mark McKoy | AUT CAN |
ATH | Olympics | 1984—1996 | 0–0–1 1983 Edmonton ATH bronze: 110 m hurdles (competed for Canada) |
| Murray McLachlan | RSA |
SWM | Olympics | 1960 | 1–2–1 1961 Sofia SWI gold: 1500 m freestyle, silver: 400 m freestyle; 1963 Porto Alegre SWI silver: 400 m freestyle, bronze: 1500 m freestyle |
| Anneisha McLaughlin-Whilby | JAM |
ATH | Olympics | 2016 | 1–0–1 2011 Shenzhen ATH gold: 200 m, bronze: 4×100 m relay (competed as Anneisha McLaughlin) |
| Matt McLean | USA |
SWM | Olympics | 2012 | 2–0–0 2011 Shenzhen SWI gold: 200 m freestyle and 4×200 m freestyle relay |
| Nancy McLeón | CUB |
ATH | Olympics | 1992 | 0–2–1 1993 Buffalo ATH silver: 4×400 m relay, bronze: 400 m; 1997 Catania ATH silver: 4×400 m relay |
| Jack McLoughlin | AUS |
SWM | Olympics | 2016—2020 | 0–2–0 2015 Gwangju SWI silver: 400 m freestyle and 4×200 m freestyle relay |
| Lee McNeill | USA |
ATH | Olympics | 1988 | 0–0–2 1985 Kobe ATH bronze: 100 m and 4×100 m relay |
| Christian McNeish | GBR |
TKW | YOG | 2014 | 0–0–1 2015 Gwangju TKW bronze: featherweight -68 kg |
| Jenny Meadows | GBR |
ATH | Olympics | 2008 | 0–1–0 2001 Beijing ATH silver: 4×400 m relay |
| Danny Meagher | CAN |
BKB | Olympics | 1984 | 1–0–0 1983 Edmonton BAS gold |
| Mary T. Meagher | USA |
SWM | Olympics | 1984—1988 | 3–1–0 1985 Kobe SWI gold: 100 m butterfly, 200 m butterfly, and 4×100 m medley relay, silver: 200 m freestyle |
| Fernando Medina | ESP |
FEN | Olympics | 1996—2004 | 0–1–1 1999 Palma de Mallorca FEN silver: sabre team; 2001 Beijing FEN bronze: sabre team |
| Vitaliy Medvediev | UKR |
FEN | Olympics | 2008 | 1–0–1 2007 Bangkok FEN gold: épée team; 2009 Beograd FEN bronze: épée team |