| Name | Nation | Sport | Games | Notes |
|---|
| Jean de Mas Latrie | France | Fencing, Modern pentathlon | 1908 Summer, 1912 Summer | |
| Arturo Mas | Spain | Sailing | 1924 Summer | |
| Ayoub Al-Mas | United Arab Emirates | Swimming | 2000 Summer | |
| Fermín Más | Spain | Water polo | 1968 Summer | |
| Gloria Mas | Figure skating | 1980 Winter | |
| Meritxell Mas | Artistic swimming | 2020 Summer, 2024 Summer | |
| Natalia Más | Swimming | 1980 Summer | |
| Silvia Mas | Sailing | 2020 Summer | |
| Teresa Mas | Rowing | 2004 Summer | |
| Edith Masai | Kenya | Athletics | 2004 Summer | |
| Linet Masai | 2008 Summer | |
| Moses Ndiema Masai | 2008 Summer, 2012 Summer | |
| Liz Masakayan | United States | Volleyball | 1988 Summer | |
| Daniele Masala | Italy | Modern pentathlon | 1976 Summer, 1984 Summer, 1988 Summer | |
| Pietro Masala | West Germany | Weightlifting | 1972 Summer | |
| Tshepiso Masalela | Botswana | Athletics | 2024 Summer | |
| Hassan Masallam | Saudi Arabia | 1976 Summer | |
| Edgars Masaļskis | Latvia | Ice hockey | 2006 Winter, 2010 Winter, 2014 Winter | |
| Agustín Masaña | Spain | Field hockey | 1968 Summer, 1976 Summer | |
| Javier Masana | Alpine skiing | 1964 Winter | |
| Hernán Masanés | Chile | Road cycling, Track cycling | 1952 Summer, 1956 Summer | |
| Mario Masanés | 1948 Summer | |
| Dušan Masár | Czechoslovakia | Wrestling | 1988 Summer | |
| Felix Masár | Canoe sprint | 1980 Summer | |
| La Paene Masara | Indonesia | Boxing | 1996 Summer, 2000 Summer | |
| Ivan Masařík | Czechoslovakia, Czech Republic | Biathlon | 1992 Winter, 1994 Winter, 1998 Winter, 2002 Winter | |
| Abdelrahman Al-Masatfa | Jordan | Karate | 2020 Summer | |
| Yacoub Masboungi | Lebanon | Swimming | 1968 Summer | |
| Bruno Mascarenhas | Italy | Rowing | 2004 Summer, 2008 Summer | |
| Henrique Mascarenhas [ Wikidata ] | Angola | Swimming | 2024 Summer | |
| Jarbas Mascarenhas | Brazil | Athletics | 2004 Summer | |
| Patrick Mascarenhas | Sailing | 1972 Summer | |
| José María Mascaro | Mexico | Field hockey | 1972 Summer | |
| David Mascató | Spain | Canoe sprint | 2000 Summer, 2004 Summer | |
| Claude-Léon Mascaux | France | Art competitions | 1924 Summer | |
| Léonard Mascaux | Athletics | 1924 Summer | |
| Georg Mascetti | Saar | Swimming | 1952 Summer | |
| Javier Mascherano | Argentina | Football | 2004 Summer, 2008 Summer | |
| Marcelo Mascheroni | Field hockey | 1988 Summer | |
| Emerance Maschmeyer | Canada | Ice hockey | 2022 Winter | |
| Bruno Masciadri | Switzerland | Canoe sprint | 1948 Summer | |
| Roberto Masciarelli | Italy | Volleyball | 1992 Summer | |
| Rolandas Maščinskas | Lithuania | Rowing | 2012 Summer | |
| Aldo Masciotta | Italy | Fencing | 1936 Summer | |
| Giovanna Masciotta | 1964 Summer, 1968 Summer | |
| Cynthia Mascitto | Short track speed skating | 2018 Winter, 2022 Winter | |
| Joel Mascoll | Saint Vincent and the Grenadines | Athletics | 1996 Summer | |
| Noah Mascoll-Gomes | Antigua and Barbuda | Swimming | 2016 Summer | |
| Anna Chiara Mascolo | Italy | 2020 Summer | |
| Claudette Masdammer | Guyana | Athletics | 1956 Summer | |
| Motlatsi Maseela | Lesotho | 1996 Summer | |
| Micah Masei | American Samoa | Swimming | 2020 Summer, 2024 Summer | |
| Aleksandr Maseikov | Unified Team, Belarus | Canoe sprint | 1992 Summer, 1996 Summer, 2000 Summer | |
| Zlatko Mašek | Yugoslavia | Shooting | 1952 Summer, 1956 Summer | |
| Ragnvald Maseng | Norway | 1912 Summer | |
| Miyanda Maseti | South Africa | Cycling BMX racing | 2024 Summer | |
| Peter Masfen | New Zealand | Rowing | 1964 Summer | |
| Ahmed Mahmoud Mashall | Egypt | Weightlifting | 1976 Summer | |
| Syaqiera Mashayikh | Malaysia | Archery | 2020 Summer, 2024 Summer | |
| Jesse Mashburn | United States | Athletics | 1956 Summer | |
| Ruslan Mashchenko | Russia | 1996 Summer, 2000 Summer, 2004 Summer | |
| Lesiba Precious Mashele | South Africa | 2020 Summer | |
| Gakologelwang Masheto | Botswana | 2008 Summer | |
| Bassel Mashhour | Egypt | Water polo | 2004 Summer | |
| Jan Mashiani | South Africa | Athletics | 1904 Summer | |
| Oleg Mashkin | Ukraine | Boxing | 2004 Summer | |
| Anatoly Mashkov | Soviet Union | Speed skating | 1968 Winter | |
| Salem Mashour | Egypt | Rowing | 1964 Summer | |
| Ruslan Mashurenko | Ukraine | Judo | 1996 Summer, 2000 Summer | |
| Iosefo Masi | Fiji | Rugby sevens | 2020 Summer, 2024 Summer | |
| Franciszek Masiak | Poland | Art competitions | 1932 Summer, 1936 Summer | |
| Estuardo Masías | Peru | Rowing | 1960 Summer | |
| Beatrice Masilingi | Namibia | Athletics | 2020 Summer | |
| Olga Masilionene | Belarus | Basketball | 2008 Summer | |
| Boitumelo Masilo | Botswana | Athletics | 2016 Summer | |
| George Masin | United States | Fencing | 1972 Summer, 1976 Summer | |
| Massimiliano Masin | Italy | Baseball | 1992 Summer, 1996 Summer | |
| Celestine Masinde | Kenya | Rugby sevens | 2016 Summer | |
| Massimo Masini | Italy | Basketball | 1964 Summer, 1968 Summer, 1972 Summer | |
| Paul Masino | France | Artistic gymnastics | 1936 Summer | |
| Enric Masip | Spain | Handball | 1992 Summer, 2000 Summer | |
| Javier Masís | Costa Rica | Football | 1980 Summer | |
| Ksawery Masiuk | Poland | Swimming | 2024 Summer | |
| Tomas Masiulis | Lithuania | Basketball | 2000 Summer | |
| Vladimír Maška | Czech Republic | Athletics | 2000 Summer, 2004 Summer | |
| Edgars Maskalāns | Latvia | Bobsleigh | 2010 Winter | |
| Mohamed Said Al-Maskary | Oman | Athletics | 2000 Summer | |
| Henry Maske | East Germany | Boxing | 1988 Summer | |
| Edna Maskell | South Africa | Athletics | 1952 Summer | |
| Michael Maskell | Barbados | Shooting | 1992 Summer, 1996 Summer, 2000 Summer, 2004 Summer, 2016 Summer | |
| Ryan Maskelyne | Papua New Guinea | Swimming | 2020 Summer | |
| Kiryl Maskevich | Belarus | Wrestling | 2020 Summer | |
| Umesh Maskey | Nepal | Boxing | 1984 Summer | |
| Yevgeny Maskinskov | Soviet Union | Athletics | 1956 Summer | |
| Darius Maskoliūnas | Lithuania | Basketball | 2000 Summer | |
| Hana Mašková | Czechoslovakia | Figure skating | 1964 Winter, 1968 Winter | |
| Pavel Maslák | Czech Republic | Athletics | 2012 Summer, 2016 Summer, 2020 Summer | |
| Valentin Maslakov | Soviet Union | 1968 Summer | |
| Lyudmila Maslakova | 1968 Summer, 1972 Summer, 1976 Summer, 1980 Summer | |
| František Mašlaň | Czechoslovakia | Ice hockey | 1960 Winter | |
| Marek Maślany | Poland | Weightlifting | 1996 Summer | |
| Tanya Maslarska | Bulgaria | Artistic gymnastics | 1992 Summer | |
| Nastassia Maslava | Belarus | Athletics | 2020 Summer | |
| Bob Maslen-Jones | Great Britain | Shooting | 1948 Summer | |
| Sergey Maslennikov | Russia | Nordic combined | 2006 Winter, 2010 Winter | |
| Vladimir Maslennikov | Russia, Russian Olympic Committee | Shooting | 2016 Summer, 2020 Summer | |
| Frank Masley | United States | Luge | 1980 Winter, 1984 Winter, 1988 Winter | |
| Olha Maslivets | Ukraine | Sailing | 2000 Summer, 2004 Summer, 2008 Summer, 2012 Summer | |
| Aleksey Maslov | Unified Team | Alpine skiing | 1992 Winter | |
| Darya Maslova | Kyrgyzstan | Athletics | 2016 Summer, 2020 Summer | |
| Valentyna Bolshova | Soviet Union | 1960 Summer | |
| Vanda Maslovska | Ukraine | Weightlifting | 2004 Summer | |
| Anatoli Maslyonkin | Soviet Union | Football | 1956 Summer | |
| Marina Maslyonko | Kazakhstan | Athletics | 2012 Summer | |
| Lenka Masná | Czech Republic | 2012 Summer | |
| Florence Masnada | France | Alpine skiing | 1992 Winter, 1994 Winter, 1998 Winter | |
| Vojtech Masný | Czechoslovakia | Football | 1964 Summer | |
| Alaa Maso | Refugee Olympic Team | Swimming | 2020 Summer, 2024 Summer | |
| Mohamad Maso | Syria | Triathlon | 2020 Summer | |
| Tiyapo Maso | Botswana | Athletics | 2000 Summer | |
| Maselino Masoe | American Samoa | Boxing | 1988 Summer, 1992 Summer, 1996 Summer | |
| Mika Masoe | 1988 Summer, 1992 Summer | |
| Erik Masoero | Italy | Canoe slalom | 2004 Summer, 2008 Summer | |
| Romina Masolini | Snowboarding | 2006 Winter | |
| Bill Mason | Great Britain | Rowing | 1972 Summer, 1976 Summer | |
| Bob Mason | United States | Ice hockey | 1984 Winter | |
| Charles Mason | Rowing | 1928 Summer | |
| Diana Mason | Great Britain | Equestrian dressage | 1976 Summer, 1988 Summer | |
| Elizabeth Mason | United States | Art competitions | 1932 Summer | |
| Frank Henry Mason | Great Britain | 1932 Summer | |
| Frederick Mason | Wrestling | 1920 Summer | |
| Geoffrey Mason | United States | Bobsleigh | 1928 Winter | |
| Gerald Mason | Great Britain | Lacrosse | 1908 Summer | |
| Germaine Mason | Athletics | 2008 Summer | |
| Hugh Mason | Rowing | 1936 Summer | |
| Jacqueline Mason | Australia | Figure skating | 1960 Winter | |
| Jamele Mason | Puerto Rico | Athletics | 2012 Summer | |
| James Mason | Australia | Field hockey | 1968 Summer, 1972 Summer | |
| Janice Mason | Canada | Rowing | 1984 Summer | |
| Larry Mason | Speed skating | 1960 Winter | |
| Leslie Mason | Boxing | 1956 Summer | |
| Lisa Mason | Great Britain | Artistic gymnastics | 2000 Summer | |
| Mark Mason | Guyana | Athletics | 1992 Summer | |
| Michael Mason | Canada | Swimming | 1992 Summer | |
| Michael Mason | Athletics | 2008 Summer, 2012 Summer, 2016 Summer, 2020 Summer | |
| Norman Mason | Great Britain | Canoe sprint | 1976 Summer | |
| Simon Mason | Field hockey | 1996 Summer, 2000 Summer, 2004 Summer | |
| Agapius Masong | Tanzania | Athletics | 1984 Summer | |
| Mirza Masood | India | Field hockey | 1936 Summer | |
| Karel Masopust | Czechoslovakia | Ice hockey | 1968 Winter | |
| Karina Masotta | Argentina | Field hockey | 1996 Summer, 2000 Summer | |
| Fabio Masotti | Italy | Track cycling | 2008 Summer | |
| El-Sayed Ibrahim Masoud | Egypt | Weightlifting | 1936 Summer | |
| Mohamed Masoud | Volleyball | 2016 Summer, 2024 Summer | |
| Fardin Masoumi | Iran | Wrestling | 2008 Summer | |
| Stamatios Masouris | Greece | Athletics | 1896 Summer | |
| Antonio Maspes | Italy | Track cycling | 1952 Summer | |
| Alexandre Maspoli | France | Art competitions | 1924 Summer | |
| Yousef Masrahi | Saudi Arabia | Athletics | 2012 Summer | |
| Wohib Masresha | Ethiopia | 1968 Summer, 1972 Summer | |
| Ahmed El-Masri | Lebanon | Boxing | 1988 Summer | |
| Hisham Al-Masri | Syria | Swimming | 1992 Summer, 1996 Summer | |
| Muneir Al-Masri | Jordan | Wrestling | 1988 Summer | |
| Nader al-Masri | Palestine | Athletics | 2008 Summer | |
| Rafed El-Masri | Syria, Germany | Swimming | 2004 Summer, 2008 Summer | |
| Ibrahim El-Masry | Egypt | Football | 1992 Summer | |
| Ibrahim El-Masry | Handball | 2016 Summer, 2020 Summer, 2024 Summer | |
| Faraj Al-Mass | Qatar | Football | 1984 Summer | |
| Leo Massa | United States | Cross country skiing | 1960 Winter | |
| Leonardo Massa | Italy | Rowing | 1988 Summer | |
| Mario Massa | Swimming | 1908 Summer, 1912 Summer, 1920 Summer | |
| Sebastián Massa | Argentina | Rowing | 2000 Summer | |
| Adel Massaad | Egypt | Table tennis | 2008 Summer | |
| Jonathan Massacand | Switzerland | Swimming | 2008 Summer | |
| Abdel Rahman Massad | Sudan | Athletics | 1988 Summer | |
| Jimmy Massallay | Sierra Leone | 1980 Summer | |
| Pedro Massana | Spain | Rowing | 1952 Summer | |
| Ricardo Massana | 1924 Summer | |
| Valentí Massana | Athletics | 1992 Summer, 1996 Summer, 2000 Summer | |
| Abderrazak Ben Massaoud | Tunisia | Volleyball | 1988 Summer | |
| Hamouda Ben Massaoud | 1972 Summer | |
| Alifu Massaquoi | Liberia, Sierra Leone | Athletics | 1960 Summer, 1968 Summer | |
| Rooney Massara | Great Britain | Rowing | 1972 Summer | |
| Renzo Massarani | Italy | Art competitions | 1936 Summer | |
| Albert Massard | Luxembourg | Football | 1924 Summer | |
| Armand Massard | France | Fencing | 1920 Summer, 1924 Summer, 1928 Summer | |
| Jean Massard | Luxembourg | Football | 1920 Summer | |
| Charlotte Massardier | France | Artistic swimming | 1996 Summer, 2000 Summer | |
| Paul Massarek | Austria | Field hockey | 1928 Summer | |
| Claudia Massari | West Germany | Figure skating | 1984 Winter | |
| Ettore Massari [ Wikidata ] | Italy | Artistic gymnastics | 1908 Summer | |
| Egidio Massaria | Swimming | 1952 Summer | |
| Daniele Massaro | Football | 1984 Summer | |
| Domingo Massaro | Chile | 1952 Summer | |
| Yousif Massas | Syria | Boxing | 2000 Summer | |
| Alfredo Massazza | Italy | Archery | 1972 Summer | |
| Massé [ Wikidata ] | France | Fencing | 1900 Summer | |
| Kylie Masse | Canada | Swimming | 2016 Summer, 2020 Summer, 2024 Summer | |
| Esteban Masseilot | Uruguay | Rowing | 1968 Summer | |
| Einar Mässeli | Finland | Cross country skiing | 1928 Winter | |
| Gustave Masselin [ Wikidata ] | France | Fencing | 1900 Summer | |
| Kenneth Masser | Great Britain | Rowing | 1956 Summer | |
| Daniela Masseroni | Italy | Rhythmic gymnastics | 2004 Summer, 2008 Summer | |
| Lucien Masset | France | Artistic gymnastics | 1936 Summer, 1948 Summer | |
| Manon Masseurs | Netherlands | Swimming | 1996 Summer | |
| Billie Massey | Belgium | Basketball | 2020 Summer, 2024 Summer | |
| Billie Massey | 2024 Summer | |
| Kelly Massey | Great Britain | Athletics | 2016 Summer | |
| Kent Massey | United States | Sailing | 1996 Summer | |
| Paul Massey | Great Britain | Rowing | 1948 Summer, 1952 Summer | |
| Jean Massez | Belgium | Speed skating | 1952 Winter | |
| Alexander Massialas | United States | Fencing | 2012 Summer, 2016 Summer, 2020 Summer, 2024 Summer | |
| Greg Massialas | 1984 Summer, 1988 Summer | |
| Sabrina Massialas | 2020 Summer | |
| René Massiasse | France | Rowing | 1956 Summer | |
| Sergio Massidda | Italy | Weightlifting | 2024 Summer | |
| Giddeon Massie | United States | Track cycling | 2004 Summer, 2008 Summer | |
| Anthony Massimino | Italy | Baseball | 2004 Summer | |
| Carlo Massimino | Australia | Taekwondo | 2000 Summer, 2004 Summer | |
| Gerlinde Massing | Austria | Athletics | 1972 Summer | |
| Santiago Massini | Argentina | Fencing | 1952 Summer, 1956 Summer | |
| Emilio Massino | Italy | Sailing | 1956 Summer | |
| Susan Massitti | Canada | Speed skating | 1998 Winter | |
| Jorge Massó | Cuba | Football | 1976 Summer, 1980 Summer | |
| Luca Masso | Argentina | Field hockey | 2016 Summer | |
| Maykel Massó | Cuba | Athletics | 2016 Summer, 2020 Summer | |
| René Massol | France | Water polo | 1948 Summer | |
| Cencio Massola | Italy | Sailing | 1924 Summer | |
| Alain Masson | Canada | Road cycling, Cross country skiing | 1984 Summer, 1988 Winter, 1992 Winter | |
| Antoine Masson | Belgium | Boxing | 1920 Summer | |
| Caroline Masson | Germany | Golf | 2016 Summer, 2020 Summer | |
| Chana Masson | Brazil | Handball | 2000 Summer, 2004 Summer, 2008 Summer, 2012 Summer | |
| Charles Masson | France | Field hockey | 2024 Summer | |
| Henri Masson | Fencing | 1900 Summer | |
| Jérémy Masson | Short track speed skating | 2010 Winter | |
| Marie-Andrée Masson | Canada | Cross country skiing | 1988 Winter | |
| Paul Masson | France | Track cycling | 1896 Summer | |
| Carlo Massone | Italy | Sailing | 1968 Summer | |
| Carlos Domingos Massoni | Brazil | Basketball | 1960 Summer, 1964 Summer, 1968 Summer, 1972 Summer | |
| Charles Massonnat | France | Rowing | 1928 Summer | |
| Walter Massop | Netherlands | Wrestling | 1928 Summer | |
| Bruno Massot | Germany | Figure skating | 2018 Winter | |
| Nicolás Massú | Chile | Tennis | 2000 Summer, 2004 Summer, 2008 Summer | |
| Philippe Massu | France | Sailing | 1984 Summer | |
| Carlo Massullo | Italy | Modern pentathlon | 1984 Summer, 1988 Summer, 1992 Summer | |
| Alexandre Massura | Brazil | Swimming | 1996 Summer, 2000 Summer | |
| Jozef Massy | Belgium | Canoe sprint | 1948 Summer | |
| Pierre Massy | Netherlands | Football | 1928 Summer | |
| Varvara Massyagina | Kazakhstan | Judo | 2004 Summer | |
| Denis Mast | Switzerland | Cross country skiing | 1968 Winter | |
| Douglas Mast | Virgin Islands | Shooting | 1972 Summer | |
| Fritz Mast | Switzerland | Weightlifting | 1948 Summer | |
| Daniel Măstăcan | Romania | Rowing | 2004 Summer | |
| Vasile Măstăcan | 1992 Summer, 1996 Summer, 2000 Summer | |
| Giovanni Mastel | Italy | Ice hockey | 1964 Winter | |
| Rie Mastenbroek | Netherlands | Swimming | 1936 Summer | |
| Chauncy Master | Malawi | Athletics | 2008 Summer | |
| Edith Master | United States | Equestrian dressage | 1968 Summer, 1972 Summer, 1976 Summer | |
| Tereza Master | Malawi | Athletics | 2016 Summer | |
| Svetlana Masterkova | Russia | 1996 Summer, 2000 Summer | |
| Bree Masters | Australia | 2024 Summer | |
| George Masters | Great Britain | Artistic gymnastics | 1920 Summer | |
| Richard Masters | Bermuda | Sailing | 1960 Summer | |
| Ron Masters | Australia | Diving | 1936 Summer | |
| Stephen Masters | Denmark | Rowing | 1992 Summer | |
| Timothy Masters | Australia | 2020 Summer, 2024 Summer | |
| Edward Masterson | United States | 1956 Summer | |
| Arturas Mastianica | Lithuania | Athletics | 2016 Summer, 2020 Summer | |
| Samir Mastiev [ Wikidata ] | Russian Olympic Committee | Nordic combined | 2022 Winter | |
| Tim Mastnak | Slovenia | Snowboarding | 2018 Winter, 2022 Winter | |
| June Maston | Australia | Athletics | 1948 Summer | |
| Nikolaos Mastoridis | Greece | Boxing | 1932 Summer | |
| Natalie Mastracci | Canada | Rowing | 2012 Summer, 2016 Summer | |
| Antonio Mastrandrea | Italy | Canoe sprint | 1980 Summer | |
| Luigi Mastrangelo | Volleyball | 2000 Summer, 2004 Summer, 2008 Summer, 2012 Summer | |
| Maddie Mastro | United States | Snowboarding | 2018 Winter, 2022 Winter | |
| Michele Mastrodonato | Italy | Boxing | 1988 Summer | |
| Sofia Mastroianni [ Wikidata ] | Artistic swimming | 2024 Summer | |
| Salvatore Mastroieni | Athletics | 1936 Summer | |
| Mariano Mastromarino | Argentina | 2016 Summer | |
| Michele Mastromarino [ Wikidata ] | Italy | Artistic gymnastics | 1920 Summer | |
| Gabe Mastromatteo | Canada | Swimming | 2020 Summer | |
| Nicholas Mastromatteo | United States | Luge | 1964 Winter | |
| Artyom Mastrov | Russia | Athletics | 2000 Summer | |
| George Mastrovich [ Wikidata ] | United States | Artistic gymnastics | 1904 Summer | |
| Mike Mastrullo | Italy | Ice hockey | 1984 Winter | |
| Aleksandr Mastyanin | Soviet Union | Shooting | 1980 Summer | |
| Anna Mastyanina | Russia | 2012 Summer | |
| Leonardo Masu | Italy | Weightlifting | 1960 Summer | |
| Mariko Masubuchi | Japan | Softball | 2000 Summer | |
| Chiyori Masuchi | Judo | 1992 Summer | |
| Kamal Masud | Pakistan | Swimming | 1996 Summer, 2000 Summer | |
| Akemi Masuda | Japan | Athletics | 1984 Summer | |
| Aoi Masuda | Swimming | 2020 Summer | |
| Hiroshi Masuda | Athletics | 1920 Summer | |
| Isao Masuda | Swimming | 1960 Summer | |
| Iwao Masuda | Athletics | 1932 Summer | |
| Keita Masuda | Badminton | 2000 Summer, 2004 Summer, 2008 Summer | |
| Koji Masuda | Boxing | 1964 Summer | |
| Nariyuki Masuda | Road cycling | 2020 Summer | |
| Takashi Masuda | Basketball | 1960 Summer, 1964 Summer | |
| Toshiki Masui | Equestrian jumping | 2016 Summer | |
| Wuttichai Masuk | Thailand | Boxing | 2016 Summer | |
| Menzi Masuku | South Africa | Football | 2016 Summer | |
| Marisa Masullo | Italy | Athletics | 1980 Summer, 1984 Summer, 1988 Summer | |
| Wally Masur | Australia | Tennis | 1988 Summer, 1992 Summer | |
| Erich Masurat | West Germany | Shooting | 1968 Summer | |
| Shoichi Masutomi | Japan | Wrestling | 1936 Summer | |
| Julius Masvanise | Zimbabwe | Athletics | 1996 Summer | |
| Shaun Maswanganyi | South Africa | 2020 Summer, 2024 Summer | |
| Łukasz Maszczyk | Poland | Boxing | 2008 Summer | |
| Zygmunt Maszczyk | Football | 1972 Summer, 1976 Summer | |
| Antoni Maszewski | Athletics | 1936 Summer | |
| Lajos Maszlay | Hungary | Fencing | 1936 Summer, 1948 Summer, 1952 Summer | |
| Kamil Masztak | Poland | Athletics | 2012 Summer | |
| Stefan Masztak | Shooting | 1960 Summer | |
| Andrés Mata | Spain | Weightlifting | 2012 Summer, 2016 Summer, 2020 Summer | |
| Djana Mata | Albania | Shooting | 1996 Summer, 2000 Summer | |
| Edwin Mata | Ecuador | Weightlifting | 1988 Summer | |
| Félix Mata | Venezuela | Athletics | 1972 Summer | |
| Héctor Mata | Volleyball | 2020 Summer | |
| Jayme Mata | Aruba | Judo | 2012 Summer, 2016 Summer | |
| Juan Mata | Spain | Football | 2012 Summer | |
| Lucas Mata | Australia | Bobsleigh | 2014 Winter, 2018 Winter | |
| Marcos Mata | Argentina | Basketball | 2012 Summer | |
| Mauricio Mata | Mexico | Road cycling, Track cycling | 1960 Summer | |
| Melissa Mata | Costa Rica | Swimming | 1996 Summer | |
| Viliame Mata | Fiji | Rugby sevens | 2016 Summer | |
| Emmanuel Matadi | Liberia | Athletics | 2016 Summer, 2020 Summer, 2024 Summer | |
| Cephas Matafi | Zimbabwe | 1992 Summer | |
| Daniel Mateiko | Kenya | 2024 Summer | |
| Shiro Mataki | Japan | Rowing | 1976 Summer | |
| Dubravko Mataković | Yugoslavia | Canoe slalom | 1972 Summer | |
| Juan Vicente Matala | Equatorial Guinea | Athletics | 1992 Summer | |
| Alphonse Hercule Matam | Cameroon | Weightlifting | 1992 Summer | |
| Bernardin Matam | France | 2012 Summer, 2016 Summer, 2020 Summer, 2024 Summer | |
| David Matam | 2004 Summer | |
| Samson Matam | Cameroon, France | 1996 Summer, 2000 Summer, 2004 Summer | |
| Karen Matamoros | Costa Rica | Cycling mountain bike | 2004 Summer | |
| Jerry Matana | Fiji | Rugby sevens | 2024 Summer | |
| Failuna Abdi Matanga | Tanzania | Athletics | 2020 Summer | |
| Patrick Matangi | Zimbabwe | Judo | 1988 Summer, 1992 Summer | |
| Marcel Matanin | Slovakia | Athletics | 2004 Summer | |
| Ismail Matar | United Arab Emirates | Football | 2012 Summer | |
| Risto Mätas | Estonia | Athletics | 2012 Summer, 2016 Summer | |
| Andrea Mátay | Hungary | 1976 Summer, 1980 Summer | |
| Ihab Al-Matbouli | Jordan | Boxing | 2012 Summer | |
| Givi Matcharashvili | Georgia | Wrestling | 2024 Summer | |
| John Matchefts | United States | Ice hockey | 1956 Winter | |
| Filip Matczak | Poland | 3x3 basketball | 2024 Summer | |
| Acacia Mate | Mozambique | Athletics | 1980 Summer | |
| Gábor Máté | Hungary | 2000 Summer, 2004 Summer, 2008 Summer | |
| Hunor Mate | Austria | Swimming | 2008 Summer, 2012 Summer | |
| Ilya Mate | Soviet Union | Wrestling | 1980 Summer | |
| Lajos Máté | Hungary | Alpine skiing | 1948 Winter | |
| Tibor Máté | Handball | 1936 Summer | |
| Petra Matechová | Czechoslovakia | Luge | 1992 Winter | |
| Richard Mateelong | Kenya | Athletics | 2008 Summer | |
| Mugur Mateescu | Romania | 1996 Summer | |
| Rodica Mateescu | 1996 Summer | |
| Geno Mateev | Bulgaria | Football | 1924 Summer | |
| Nikolay Mateev | Fencing | 1988 Summer | |
| Vesela Mateeva | Artistic gymnastics | 1976 Summer | |
| Eszter Mátéfi | Hungary | Handball | 1996 Summer | |
| Lucy Matehaere [ Wikidata ] | New Zealand | Canoe sprint | 2024 Summer | |
| Alexandru Matei | Romania | Water polo | 2012 Summer | |
| Aneta Matei | Rowing | 1976 Summer, 1980 Summer | |
| Anișoara Matei | Shooting | 1988 Summer | |
| Edit Matei | Austria | Handball | 1992 Summer | |
| Ilie Matei | Romania | Wrestling | 1984 Summer | |
| Sorin Matei | Athletics | 1980 Summer, 1988 Summer, 1992 Summer | |
| Eugenia Mateianu | Fencing | 1960 Summer | |
| Julija Matej | Yugoslavia | Athletics | 1948 Summer | |
| Andrzej Mateja | Poland | Cross country skiing | 1956 Winter, 1960 Winter | |
| Robert Mateja | Ski jumping | 1998 Winter, 2002 Winter, 2006 Winter | |
| Josef Matějček | Czechoslovakia | Weightlifting | 1928 Summer | |
| Friederike Matejka | Austria | Luge | 1964 Winter | |
| Alice Matějková | Czech Republic, Spain | Athletics | 1996 Summer, 2000 Summer, 2004 Summer | |
| Michaela Matejová | Slovakia | Ice hockey | 2010 Winter | |
| Marco Matellini | Peru | Shooting | 2008 Summer | |
| Hana Matelová | Czech Republic | Table tennis | 2016 Summer, 2020 Summer, 2024 Summer | |
| Erwin Matelski | Poland | Shooting | 1980 Summer | |
| Daniel Mateo | Spain | Athletics | 2020 Summer | |
| José Mateo [ Wikidata ] | Puerto Rico | Baseball | 1992 Summer | |
| Pablo Matéo | France | Athletics | 2024 Summer | |
| Wander Mateo | Dominican Republic | Judo | 2016 Summer | |
| Francisco Mateos | Spain | Weightlifting | 1972 Summer, 1976 Summer | |
| Manuel Mateos | Mexico | 1968 Summer | |
| Matheo Mateos [ Wikidata ] | Paraguay | Swimming | 2024 Summer | |
| Ibrahim Mater | Saudi Arabia | Football | 1996 Summer | |
| Zeyad Mater | Yemen | Judo | 2016 Summer | |
| Riccardo Materazzi | Italy | Athletics | 1984 Summer | |
| Kazimierz Materski | Poland | Ice hockey | 1932 Winter | |
| Ben Mates | Australia | Snowboarding | 2006 Winter, 2010 Winter | |
| Vita Mateshuk | Ukraine | Volleyball | 1996 Summer | |
| Jean-Philippe Mateta | France | Football | 2024 Summer | |
| Samuel Matete | Zambia | Athletics | 1988 Summer, 1992 Summer, 1996 Summer, 2000 Summer | |
| Ladislav Matetić | Yugoslavia | Rowing | 1952 Summer | |
| Jaime Mateu | Spain | Skateboarding | 2020 Summer | |
| Alicia Mateus | Mozambique | Swimming | 2020 Summer | |
| Robert Mateusiak | Poland | Badminton | 2000 Summer, 2004 Summer, 2008 Summer, 2012 Summer, 2016 Summer | |
| Svitlana Matevusheva | Ukraine | Sailing | 2004 Summer | |
| Maja Matevžič | Slovenia | Tennis | 2004 Summer | |
| Walter Mathä | Austria | Boxing | 1936 Summer | |
| Ajaip Singh Matharu | Uganda | Field hockey | 1972 Summer | |
| Inderjit Singh Matharu | Kenya | 1988 Summer | |
| Santokh Singh Matharu | 1964 Summer, 1968 Summer | |
| Martin Mathathi | Athletics | 2008 Summer | |
| Paul Mathaux | France | Football | 1908 Summer | |
| Jeffrey Mathebula | South Africa | Boxing | 2000 Summer | |
| Josh Matheny | United States | Swimming | 2024 Summer | |
| Bruce Mather | Ice hockey | 1948 Winter | |
| Peter Mather | Great Britain | Fencing | 1976 Summer | |
| Tommy Mather | Diving | 1928 Summer | |
| Vincent Matheron | France | Skateboarding | 2020 Summer, 2024 Summer | |
| Diana Matheson | Canada | Football | 2008 Summer, 2012 Summer, 2016 Summer | |
| Diane Matheson | Athletics | 1956 Summer | |
| Eli Matheson | Australia | Field hockey | 2008 Summer | |
| Hugh Matheson | Great Britain | Rowing | 1972 Summer, 1976 Summer, 1980 Summer | |
| James Matheson | Australia | Freestyle skiing | 2018 Winter, 2022 Winter | |
| Pedro de Matheu | El Salvador | Art competitions | 1932 Summer | |
| Matheus Henrique | Brazil | Football | 2020 Summer | |
| Jonas Matheus | Namibia | Boxing | 2012 Summer | |
| Melany del Pilar Matheus [ Wikidata ] | Cuba | Athletics | 2024 Summer | |
| Cathérine Mathevon | France | Canoe sprint | 1984 Summer | |
| Alannah Mathews | Australia | Rhythmic gymnastics | 2020 Summer | |
| John Albert Mathews | United States | Rowing | 1976 Summer | |
| Kurtis Mathews | Australia | Diving | 2024 Summer | |
| Luke Mathews | Athletics | 2016 Summer | |
| Courtney Mathewson | United States | Water polo | 2012 Summer, 2016 Summer | |
| Pedro Mathey | Peru | Road cycling | 1948 Summer | |
| Bob Mathias | United States | Athletics | 1948 Summer, 1952 Summer | |
| Charline Mathias | Luxembourg | 2016 Summer | |
| Ernest Mathias | Virgin Islands | Bobsleigh | 1992 Winter | |
| John Mathias | United States | Sailing | 1976 Summer | |
| Jorge Mathias | Portugal | Equestrian eventing | 1960 Summer | |
| Sunday Mathias | Nigeria | Weightlifting | 2000 Summer | |
| Jan Mathiasen | Denmark | Sailing | 1984 Summer, 1988 Summer | |
| Lennart Mathiasen | Canoe sprint | 1972 Summer | |
| Edvin Mattiasson | Sweden | Wrestling | 1912 Summer | |
| Teboho Mathibeli | Lesotho | Boxing | 1988 Summer | |
| Tsepo Mathibelle | Athletics | 2012 Summer, 2016 Summer | |
| Lukas Mathies | Austria | Snowboarding | 2014 Winter, 2022 Winter | |
| Charles Mathiesen | Norway | Speed skating | 1936 Winter, 1948 Winter | |
| Grethe Mathiesen | Swimming | 1972 Summer | |
| Per Mathiesen | Artistic gymnastics | 1912 Summer | |
| Sigurd Mathiesen | Fencing | 1912 Summer | |
| Theódóra Mathiesen | Iceland | Alpine skiing | 1998 Winter | |
| Þorgils Mathiesen | Handball | 1984 Summer, 1988 Summer | |
| Murray Mathieson | New Zealand | Field hockey | 1960 Summer | |
| Mathieu [ Wikidata ] | France | Rowing | 1900 Summer | |
| Evelyn Mathieu | Puerto Rico | Athletics | 1984 Summer | |
| Félix Mathieu | France | Cross country skiing | 1964 Winter, 1968 Winter | |
| Ludovic Mathieu | Short track speed skating | 1998 Winter, 2002 Winter | |
| Marie Mathieu | Puerto Rico | Athletics | 1984 Summer | |
| Mario Mathieu | Argentina | Road cycling | 1948 Summer | |
| Michael Mathieu | Bahamas | Athletics | 2008 Summer, 2012 Summer, 2016 Summer | |
| Nando Mathieu | Switzerland | Ice hockey | 1976 Winter | |
| Paul-Henri Mathieu | France | Tennis | 2008 Summer | |
| Raphaël Mathieu | Curling | 2010 Winter | |
| Michel Mathiot | Artistic gymnastics | 1948 Summer, 1952 Summer, 1956 Summer, 1960 Summer | |
| Panagiotis Mathioudakis | Greece | Water polo | 1968 Summer | |
| Adolf Mathis | Switzerland | Alpine skiing | 1960 Winter, 1964 Winter | |
| Thomas Mathis | Austria | Shooting | 2016 Summer | |
| Ivar Mathisen | Norway | Canoe sprint | 1948 Summer, 1952 Summer | |
| Lisa Mathison | Australia | Cycling mountain bike | 2004 Summer | |
| Ahmed Mathlouthi | Tunisia | Swimming | 2012 Summer, 2016 Summer | |
| Eric Mathoho | South Africa | Football | 2016 Summer | |
| Dan Mathunjawa | Eswatini | Boxing | 1996 Summer | |
| Surat Mathur | India | Athletics | 1952 Summer | |
| Cédric Mathy | Belgium | Track cycling | 1992 Summer | |
| François Mathy | Equestrian jumping | 1972 Summer, 1976 Summer | |
| Georges Mathys | Switzerland | Field hockey | 1960 Summer | |
| Monique Mathys | Figure skating | 1964 Winter | |
| André Matias | Angola | Rowing | 2016 Summer, 2024 Summer | |
| António Matias | Portugal | Judo | 1992 Summer | |
| Jorge Matias | Equestrian jumping | 1992 Summer | |
| Luis Matias | Angola | Swimming | 2004 Summer, 2008 Summer | |
| Manuel Matias | Portugal | Athletics | 1996 Summer | |
| Marek Matiaško | Slovakia | Biathlon | 2002 Winter, 2006 Winter, 2010 Winter | |
| Miroslav Matiaško | 2006 Winter, 2010 Winter, 2014 Winter | |
| Barbara Matić | Croatia | Judo | 2016 Summer, 2020 Summer, 2024 Summer | |
| Igor Matić | Serbia and Montenegro | Football | 2004 Summer | |
| Vladan Matić | Handball | 2000 Summer | |
| Andrejs Maticins | Latvia | Ice hockey | 2002 Winter | |
| Patrícia Matieli | Brazil | Handball | 2020 Summer, 2024 Summer | |
| Albert Matignon | France | Art competitions | 1932 Summer | |
| Julia Matijass | Germany | Judo | 2004 Summer | |
| Slobodan Matijević [ Wikidata ] | Serbia | Bobsleigh | 2010 Winter | |
| Vladimir Matijević | Yugoslavia | Football | 1980 Summer | |
| Marjo Matikainen-Kallström | Finland | Cross country skiing | 1984 Winter, 1988 Winter | |
| Jukka Matilainen | Athletics | 1928 Summer | |
| Kalle Matilainen | 1928 Summer | |
| Martti Matilainen | 1932 Summer, 1936 Summer | |
| Abednego Matilu | Kenya | 1992 Summer | |
| Johanna Matintalo | Finland | Cross country skiing | 2018 Winter, 2022 Winter | |
| Clark Matis | United States | 1972 Winter | |
| Vita Matīse | Latvia | Sailing | 2000 Summer, 2004 Summer | |
| Artūrs Matisons | Cycling BMX racing | 2008 Summer | |
| Auguste Matisse | France | Art competitions | 1928 Summer | |
| Zinaida Matistovich | Soviet Union | Athletics | 1960 Summer | |
| Anna Matiyenko | Russia | Volleyball | 2012 Summer | |
| Yelena Matiyevskaya | Soviet Union | Rowing | 1980 Summer | |
| Giacomo Matiz | Italy | Freestyle skiing | 2014 Winter | |
| Radomyos Matjiur | Thailand | Swimming | 2016 Summer | |
| Dušan Matković | Montenegro | Water polo | 2020 Summer, 2024 Summer | |
| Zoran Matković | Yugoslavia | Archery | 1980 Summer | |
| Antony Matkovich | Australia | Swimming | 2004 Summer | |
| Iwona Matkowska | Poland | Wrestling | 2012 Summer, 2016 Summer | |
| Marcin Matkowski | Tennis | 2004 Summer, 2008 Summer, 2012 Summer, 2016 Summer | |
| Frédérique Matla | Netherlands | Field hockey | 2020 Summer, 2024 Summer | |
| Štefan Matlák | Czechoslovakia | Football | 1964 Summer | |
| Bigboy Matlapeng | Botswana | Athletics | 1984 Summer, 1988 Summer | |
| Marian Matłoka | Poland | Canoe sprint | 1948 Summer | |
| Noko Matlou | South Africa | Football | 2012 Summer, 2016 Summer | |
| Faisal Matloub | Iraq | Weightlifting | 1980 Summer | |
| Gulnoza Matniyazova | Uzbekistan | Judo | 2016 Summer, 2020 Summer, 2024 Summer | |
| Junkichi Matoba | Japan | Athletics | 1952 Summer | |
| Jan Matocha | Czechoslovakia | Canoe sprint | 1948 Summer, 1952 Summer | |
| Moustafa Matola [ Wikidata ] | Malawi | Athletics | 1972 Summer | |
| Nkhiphitheni Matombo | South Africa | Football | 2000 Summer | |
| Georges Maton | France | Track cycling | 1936 Summer | |
| Leonel Matonse | Mozambique | Swimming | 2004 Summer | |
| Ilenia Matonti [ Wikidata ] | Italy | Taekwondo | 2024 Summer | |
| Agberto Matos | Brazil | Handball | 1996 Summer, 2004 Summer | |
| Alberto Matos | Portugal | Athletics | 1972 Summer | |
| Alessandro de Matos | Brazil | Boxing | 2004 Summer | |
| Ángel Matos | Cuba | Taekwondo | 2000 Summer, 2004 Summer, 2008 Summer | |
| Antonia Matos | Guatemala | Art competitions | 1932 Summer | |
| César de Matos | Portugal | Football | 1928 Summer | |
| Érica Matos | Brazil | Boxing | 2012 Summer | |
| Fernando Matos | Portugal | Judo | 1964 Summer | |
| Ian Matos | Brazil | Diving | 2016 Summer | |
| José de Matos | Portugal | Shooting | 1972 Summer | |
| Milán Matos | Cuba | Athletics | 1972 Summer, 1976 Summer | |
| Matea Matošević | Croatia | 2016 Summer | |
| Valter Matošević | Handball | 1996 Summer, 2004 Summer | |
| Alena Matoshka | Belarus | Athletics | 2012 Summer | |
| Jaime Matossian | Spain | Equestrian eventing | 2000 Summer | |
| Lamya Matoub | Algeria | Karate | 2020 Summer | |
| Alphonse Matoubela | Republic of the Congo | Boxing | 1980 Summer | |
| Ilja Matouš | Czechoslovakia | Cross country skiing | 1956 Winter | |
| Jan Matouš | Biathlon | 1984 Winter, 1988 Winter | |
| Josef Matouš | Ski jumping | 1964 Winter | |
| Jan Matoušek | Rowing | 1936 Summer | |
| Jaroslav Matoušek | Athletics | 1972 Summer | |
| Jiří Matoušek | Basketball | 1952 Summer | |
| Josef Matoušek | Athletics | 1964 Summer | |
| Karel Matoušek | Wrestling | 1960 Summer | |
| Katherina Matousek | Canada | Figure skating | 1984 Winter | |
| Petr Matoušek | Czechoslovakia | Road cycling | 1972 Summer, 1976 Summer | |
| Matylda Matoušková-Šínová | Artistic gymnastics | 1952 Summer, 1956 Summer, 1960 Summer | |
| Nonka Matova | Bulgaria | Shooting | 1976 Summer, 1980 Summer, 1988 Summer, 1992 Summer, 1996 Summer, 2000 Summer | |
| István Mátrai | Hungary | 1980 Summer | |
| Eduard Matras [ Wikidata ] | Austria | Art competitions | 1948 Summer | |
| Łucja Matraszek-Chydzińska | Poland | Artistic gymnastics | 1972 Summer, 1980 Summer | |
| Salvatore Matrecano | Italy | Football | 1992 Summer | |
| Pedro Matrona | Netherlands Antilles | 1952 Summer | |
| Maysa Hussain Matrood | Iraq | Athletics | 2000 Summer | |
| Ibrahim Al-Matrooshi | United Arab Emirates | 1992 Summer | |
| Yousuf Al-Matrooshi | Swimming | 2020 Summer, 2024 Summer | |
| Maha Al-Shehhi | 2024 Summer | |
| Anastasiia Matrosova | Ukraine | Judo | 2004 Summer | |
| Marina Matrossova | Kazakhstan | Cross country skiing | 2010 Winter | |
| Martha Matsa | Greece | Swimming | 2004 Summer, 2008 Summer | |
| Daniel Matsau | South Africa | Football | 2000 Summer | |
| Martin Matsbo | Sweden | Cross country skiing | 1936 Winter | |
| Helga Matschkur | West Germany | Artistic gymnastics | 1968 Summer | |
| Sibusiso Matsenjwa | Eswatini | Athletics | 2012 Summer, 2016 Summer, 2020 Summer, 2024 Summer | |
| Aggripa Matshameko | Botswana | 1996 Summer, 2000 Summer | |
| Islam Matsiev | Russia | Judo | 1996 Summer, 2000 Summer | |
| Chrislain Matsima | France | Football | 2024 Summer | |
| Ollie Matson | United States | Athletics | 1952 Summer | |
| Randy Matson | 1964 Summer, 1968 Summer | |
| Bohdana Matsotska | Ukraine | Alpine skiing | 2010 Winter, 2014 Winter | |
| Kaoru Matsubara | Japan | Athletics | 1988 Summer | |
| Kozo Matsubara | Handball | 1976 Summer | |
| Masayuki Matsubara | Wrestling | 1960 Summer | |
| Rie Matsubara | Rhythmic gymnastics | 2012 Summer, 2016 Summer, 2020 Summer | |
| Yoshika Matsubara | Football | 1996 Summer | |
| Akihiko Matsuda | Volleyball | 1992 Summer | |
| Haruko Matsuda | Badminton | 2000 Summer | |
| Kazuo Matsuda | Ice hockey | 1968 Winter | |
| Kenjiro Matsuda | Sailing | 1964 Summer | |
| Mikio Matsuda | Ice hockey | 1980 Winter | |
| Naoki Matsuda | Football | 1996 Summer, 2000 Summer | |
| Natsuko Matsuda | Swimming | 1964 Summer | |
| Noriko Matsuda | Volleyball | 1976 Summer | |
| Rinka Matsuda | Rugby sevens | 2024 Summer | |
| Ryo Matsuda | Athletics | 2004 Summer | |
| Shino Matsuda | Surfing | 2024 Summer | |
| So Matsuda | Freestyle skiing | 2022 Winter | |
| Takafumi Matsuda | Track cycling | 1972 Summer | |
| Takeshi Matsuda | Swimming | 2004 Summer, 2008 Summer, 2012 Summer, 2016 Summer | |
| Tomoyuki Matsuda | Shooting | 2008 Summer, 2012 Summer, 2016 Summer | |
| Yasuko Matsuda | Athletics | 1960 Summer | |
| Yukio Matsuda | Rowing | 1964 Summer | |
| Masaki Matsudaira | Equestrian eventing | 1964 Summer | |
| Yoritsune Matsudaira | Equestrian dressage | 1964 Summer | |
| Shina Matsudo | Swimming | 1992 Summer | |
| Hiroki Matsueda | Athletics | 2020 Summer | |
| Satoru Matsuhashi | Ski jumping | 1984 Winter | |
| Takashi Matsuhashi | Cross country skiing | 1960 Winter | |
| Miyuki Matsuhisa | Artistic gymnastics | 1968 Summer, 1972 Summer, 1976 Summer | |
| Asanosuke Matsui | Equestrian eventing | 1936 Summer | |
| Chihito Matsui | Rugby sevens | 2020 Summer | |
| Daisuke Matsui | Football | 2004 Summer | |
| Emi Matsui | Athletics | 1984 Summer, 1988 Summer | |
| Hiroyoshi Matsui | Rowing | 1992 Summer | |
| Koji Matsui | Handball | 1984 Summer | |
| Satoshi Matsui | Basketball | 1936 Summer | |
| Tadao Matsui | Shooting | 1960 Summer | |
| Takashi Matsui | Nordic combined, Ski jumping | 1960 Winter | |
| Arnold Matsulevych | Soviet Union | Athletics | 1960 Summer | |
| Takayuki Matsumiya | Japan | 2008 Summer | |
| Cazuo Matsumoto | Brazil | Table tennis | 2016 Summer | |
| Fujiya Matsumoto | Japan | Sailing | 1964 Summer | |
| Haruna Matsumoto | Snowboarding | 2018 Winter | |
| Hisato Matsumoto | Swimming | 2008 Summer | |
| Ikuo Matsumoto | Football | 1968 Summer | |
| Junya Matsumoto | Rugby sevens | 2024 Summer | |
| Kaori Matsumoto | Judo | 2012 Summer, 2016 Summer | |
| Katsuhiro Matsumoto | Swimming | 2020 Summer, 2024 Summer | |
| Kenjiro Matsumoto | 1964 Summer | |
| Mayu Matsumoto | Badminton | 2020 Summer, 2024 Summer | |
| Namika Matsumoto | Weightlifting | 2016 Summer | |
| Naomi Matsumoto | Softball | 1996 Summer, 2000 Summer | |
| Natsuha Matsumoto | Field hockey | 2020 Summer | |
| Norihiko Matsumoto | 1968 Summer | |
| Ryūtarō Matsumoto | Wrestling | 2012 Summer | |
| Sayaka Matsumoto | United States | Judo | 2008 Summer | |
| Shiho Matsumoto [ Wikidata ] | Japan | Swimming | 2024 Summer | |
| Shingo Matsumoto | Wrestling | 2004 Summer, 2008 Summer | |
| Takashige Matsumoto | Water polo | 1932 Summer | |
| Takayuki Matsumoto | Shooting | 2020 Summer | |
| Yayoi Matsumoto | Swimming | 2012 Summer, 2016 Summer | |
| Yoshihiko Matsumoto | Volleyball | 2008 Summer | |
| Yukino Matsumoto | Table tennis | 1992 Summer | |
| Ayako Matsumura | Artistic swimming | 2008 Summer | |
| Katsumi Matsumura | Volleyball | 1964 Summer, 1972 Summer | |
| Mitsuru Matsumura | Figure skating | 1976 Winter, 1980 Winter | |
| Motoharu Matsumura | Cross country skiing | 1972 Winter | |
| Suzuko Matsumura | Swimming | 1972 Summer | |
| Yoshiko Matsumura | Volleyball | 1964 Summer | |
| Akira Matsunaga | Football | 1936 Summer | |
| Daisuke Matsunaga | Athletics | 2016 Summer | |
| Masayuki Matsunaga | Artistic gymnastics | 1992 Summer | |
| Rieko Matsunaga | Rhythmic gymnastics | 2000 Summer | |
| Seiji Matsunaga | Wrestling | 1976 Summer | |
| Tetsuya Matsunaga | Sailing | 2008 Summer | |
| Tomohiro Matsunaga | Wrestling | 2008 Summer | |
| Nobuhiko Matsunaka | Baseball | 1996 Summer, 2000 Summer | |
| Akemi Matsuno | Athletics | 1988 Summer | |
| Eiichiro Matsuno | 1936 Summer | |
| Shuji Matsuno | Badminton | 1992 Summer | |
| Hiroshi Matsunobu | Artistic gymnastics | 1936 Summer | |
| Kaoru Matsuo | Shooting | 1976 Summer, 1984 Summer, 1988 Summer | |
| Kosuke Matsuo | Rowing | 1952 Summer | |
| Luisa Matsuo | Brazil | Rhythmic gymnastics | 2008 Summer | |
| Tomomi Matsuo | Japan | Badminton | 1992 Summer, 1996 Summer | |
| Akiyoshi Matsuoka | Cross country skiing | 1968 Winter, 1972 Winter | |
| Jitsuka Matsuoka | Shooting | 1976 Summer | |
| Miho Matsuoka | Basketball | 1976 Summer | |
| Shuzo Matsuoka | Tennis | 1988 Summer, 1992 Summer, 1996 Summer | |
| Yoshiyuki Matsuoka | Judo | 1984 Summer | |
| Setsuo Matsura | Rowing | 1932 Summer | |
| Katsuyuki Matsushima | Boxing | 1988 Summer | |
| Mina Matsushima | Swimming | 2012 Summer | |
| Hitomi Matsushita | Handball | 1976 Summer | |
| Kōji Matsushita | Table tennis | 1992 Summer, 1996 Summer, 2000 Summer, 2004 Summer | |
| Momotaro Matsushita | Canoe sprint | 2012 Summer, 2020 Summer | |
| Sayami Matsushita | Archery | 2004 Summer | |
| Takayoshi Matsushita | 1984 Summer, 1988 Summer, 1996 Summer, 2000 Summer | |
| Tomoyuki Matsushita | Swimming | 2024 Summer | |
| Yuki Matsushita | Athletics | 2016 Summer | |
| Yukihiro Matsushita | Swimming | 1996 Summer | |
| Misaki Matsutomo | Badminton | 2016 Summer | |
| Hiroshi Matsuura | Ice hockey | 1998 Winter | |
| Hiroyuki Matsuura | 1964 Winter | |
| Shinji Matsuura | Badminton | 1992 Summer | |
| Hideki Matsuyama | Golf | 2020 Summer, 2024 Summer | |
| Kazuoki Matsuyama | Sailing | 1972 Summer | |
| Kyosuke Matsuyama | Fencing | 2020 Summer, 2024 Summer | |
| Nami Matsuyama | Badminton | 2024 Summer | |
| Riku Matsuyama [ Wikidata ] | Swimming | 2024 Summer | |
| Pavlo Matsuyev | Ukraine | Sailing | 2016 Summer | |
| Daisuke Matsuzaka | Japan | Baseball | 2000 Summer, 2004 Summer | |
| Hatsuho Matsuzawa | Swimming | 1932 Summer | |
| Alfred Matt | Austria | Alpine skiing | 1968 Winter, 1972 Winter | |
| Andreas Matt | Freestyle skiing | 2010 Winter, 2014 Winter | |
| Egon Matt | Liechtenstein | Cross country skiing | 1948 Winter | |
| Mario Matt | Austria | Alpine skiing | 2006 Winter, 2014 Winter | |
| Michael Matt | 2018 Winter, 2022 Winter | |
| Patrick Matt | Liechtenstein | Road cycling, Track cycling | 1988 Summer, 1992 Summer | |
| Gavino Matta | Italy | Boxing | 1936 Summer | |
| Nico Mattan | Belgium | Road cycling | 2000 Summer | |
| Mattar | Brazil | Football | 1964 Summer | |
| Luiz Mattar | Tennis | 1988 Summer, 1992 Summer | |
| Ennio Mattarelli | Italy | Shooting | 1964 Summer, 1968 Summer | |
| Pier Andrea Matteazzi | Swimming | 2020 Summer | |
| Francesco Mattei | Rowing | 1996 Summer | |
| Jean Charles Mattei | France | Short track speed skating | 2006 Winter, 2010 Winter | |
| Bethanie Mattek-Sands | United States | Tennis | 2016 Summer, 2020 Summer | |
| Coline Mattel | France | Ski jumping | 2014 Winter | |
| Hippolyte Mattelé | Belgium | Rowing | 1952 Summer | |
| Adrien Mattenet | France | Table tennis | 2012 Summer | |
| Luca Matteotti | Italy | Snowboarding | 2014 Winter | |
| Henri Matter | France | Swimming | 1920 Summer | |
| Sibylle Matter | Switzerland | Triathlon | 2000 Summer | |
| Carson Mattern | Canada | Track cycling | 2024 Summer | |
| Cody Mattern | United States | Fencing | 2004 Summer | |
| Horst Mattern | West Germany | Canoe sprint | 1968 Summer, 1972 Summer | |
| Joachim Mattern | East Germany | 1972 Summer, 1976 Summer | |
| Charles Matteson | Canada | Rowing | 1936 Summer | |
| Amos Matteucci | Italy | Athletics | 1952 Summer | |
| Domenico Matteucci | Shooting | 1932 Summer | |
| Faidon Matthaiou | Greece | Rowing, Basketball | 1948 Summer, 1952 Summer | |
| Lothar Matthes | East Germany | Diving | 1968 Summer, 1972 Summer | |
| Roland Matthes | Swimming | 1968 Summer, 1972 Summer, 1976 Summer | |
| Ruthie Matthes | United States | Cycling mountain bike | 2000 Summer | |
| Sven Matthes | East Germany | Athletics | 1988 Summer | |
| Jan Mattheus | Belgium | Road cycling | 1988 Summer | |
| Catriona Matthew | Great Britain | Golf | 2016 Summer | |
| William Matthew | Australia | Equestrian dressage | 2024 Summer | |
| Thomas Matthewman | Great Britain | Athletics | 1924 Summer | |
| Alex Matthews | Rugby sevens | 2020 Summer | |
| Andrew Matthews | Bobsleigh | 2014 Winter, 2018 Winter | |
| Brenda Matthews | New Zealand | Athletics | 1972 Summer | |
| Cecil Matthews | 1936 Summer | |
| David Matthews | Ireland | 1996 Summer, 2000 Summer | |
| Gwenda Matthews | Great Britain | 1964 Summer | |
| Hannah Matthews | Ireland | Field hockey | 2020 Summer | |
| John Matthews | United States | Wrestling | 1976 Summer | |
| Julian Matthews | New Zealand | Athletics | 2016 Summer | |
| Ken Matthews | Great Britain | 1960 Summer, 1964 Summer | |
| Marcelle Matthews | South Africa | Figure skating | 1960 Winter | |
| Margaret Matthews | United States | Athletics | 1956 Summer | |
| Marlene Mathews | Australia | 1956 Summer, 1960 Summer | |
| Maurice Matthews | Great Britain | Shooting | 1908 Summer | |
| Melanie Matthews | Canada | Softball | 2008 Summer | |
| Michael Matthews | Australia | Road cycling | 2024 Summer | |
| Myfanwy Matthews | Archery | 1996 Summer | |
| Pam Matthews | Athletics | 1980 Summer | |
| Peter Matthews | Jamaica | 2016 Summer | |
| Roy Matthews | Great Britain | Archery | 1972 Summer | |
| Rudolph Matthews | United States | Handball | 1972 Summer | |
| Teran Matthews | Saint Vincent and the Grenadines | Swimming | 2000 Summer | |
| Thomas Matthews | Great Britain | Track cycling | 1908 Summer | |
| Vic Matthews | Athletics | 1960 Summer | |
| Vincent Matthews | United States | 1968 Summer, 1972 Summer | |
| Vera Matthews-Irving | Canada | Art competitions | 1948 Summer | |
| Todd Matthews-Jouda | Sudan | Athletics | 2004 Summer | |
| Maurice Matthey | Switzerland | Rowing | 1948 Summer | |
| Hans Matthiae | Germany | 1912 Summer | |
| Brendan Matthias | Canada | Athletics | 1992 Summer | |
| Eric Matthias | British Virgin Islands | 2008 Summer | |
| Willi Matthias | Germany | 1960 Summer | |
| Halldór Matthíasson | Iceland | Cross country skiing | 1976 Winter | |
| Frederikke Matthiesen [ Wikidata ] | Denmark | Canoe sprint | 2024 Summer | |
| Margriet Matthijsse | Netherlands | Sailing | 1996 Summer, 2000 Summer, 2004 Summer | |
| Elise Matthysen | Belgium | Swimming | 2008 Summer | |
| Peter Matti | Switzerland | Canoe slalom | 1992 Summer, 1996 Summer | |
| Ueli Matti | 1992 Summer, 1996 Summer | |
| Paul Mattick | Great Britain | Rowing | 2008 Summer | |
| Gino Mattiello | Italy | Weightlifting | 1920 Summer | |
| Erkka Mattila | Finland | Rowing | 1976 Summer | |
| Mikko Mattila | Shooting | 1984 Summer | |
| Pertti Mattila | Nordic combined | 1936 Winter | |
| Risto Mattila | Athletics | 1928 Summer | |
| Risto Mattila | Snowboarding | 2002 Winter, 2006 Winter | |
| Topi Mattila | Ski jumping | 1968 Winter | |
| Ville Mattila | Military ski patrol, Cross country skiing | 1924 Winter, 1928 Winter | |
| Carlo Mattioli | Italy | Athletics | 1984 Summer, 1988 Summer | |
| Denise Mattioli | Brazil | Volleyball | 1980 Summer | |
| Marcus Mattioli | Swimming | 1980 Summer | |
| Mario Mattioli | Italy | Volleyball | 1976 Summer | |
| Patrick Mattioni | France | Artistic gymnastics | 1988 Summer | |
| Firmin Mattis | Alpine skiing | 1952 Winter | |
| Sam Mattis | United States | Athletics | 2020 Summer, 2024 Summer | |
| Bruno Mattiussi | Luxembourg | Boxing | 1952 Summer | |
| Werner Mattle | Switzerland | Alpine skiing | 1972 Winter | |
| Georg Mattli | Ice hockey | 1976 Winter | |
| Sergio Matto | Uruguay | Basketball | 1952 Summer, 1956 Summer, 1960 Summer | |
| Lars Matton | Sweden | Sailing | 1948 Summer | |
| George Mattos | United States | Athletics | 1952 Summer, 1956 Summer | |
| Katrin Mattscherodt | Germany | Speed skating | 2010 Winter | |
| Curt Mattson | Finland | Sailing | 1936 Summer | |
| George Mattson | United States | Rowing | 1932 Summer | |
| Per Mattson | Sweden | 1912 Summer | |
| Ragnar Mattson | Athletics | 1912 Summer | |
| Sivert Mattsson | Cross country skiing | 1932 Winter | |
| Gustaf Mattsson | Athletics | 1920 Summer | |
| Håkan Mattson | Canoe sprint | 1976 Summer | |
| Hans-Jacob Mattsson | Ice hockey | 1920 Summer | |
| Johanna Mattsson | Wrestling | 2016 Summer | |
| John Mattsson | Athletics | 1920 Summer | |
| Kristian Mattsson | Sailing | 2004 Summer | |
| Kurt Mattsson | Finland | Boxing | 1964 Summer | |
| Lars Mattsson | Sweden | Alpine skiing | 1956 Winter | |
| Matti Mattsson | Finland | Swimming | 2012 Summer, 2016 Summer, 2020 Summer, 2024 Summer | |
| Niklas Mattsson | Sweden | Snowboarding | 2014 Winter, 2018 Winter, 2022 Winter | |
| Sofia Mattsson | Wrestling | 2008 Summer, 2012 Summer, 2016 Summer, 2020 Summer | |
| Sven Mattsson | Finland | 1920 Summer | |
| Taimi Mattsson | Fencing | 1952 Summer | |
| Nick Matuhin | Germany | Wrestling | 2012 Summer | |
| Drago Matulaj | Yugoslavia | Rowing | 1936 Summer | |
| Gintautas Matulis | Lithuania | 3x3 basketball | 2024 Summer | |
| Rashid Matumla | Tanzania | Boxing | 1988 Summer, 1992 Summer, 1996 Summer | |
| Martin Matupi | Malawi | Athletics | 1972 Summer | |
| Jan Matura | Czech Republic | Nordic combined, Ski jumping | 1998 Winter, 2002 Winter, 2006 Winter, 2014 Winter | |
| Mihály Matura | Hungary | Wrestling | 1924 Summer | |
| Héctor Maturano | Argentina | Boxing | 1952 Summer | |
| Željko Matuš | Yugoslavia | Football | 1960 Summer | |
| Hubert Matuschek | Austria | Art competitions | 1936 Summer | |
| Manfred Matuschewski | Germany | Athletics | 1960 Summer, 1964 Summer | |
| Iosif Matusec | Romania | Artistic gymnastics | 1936 Summer | |
| Vasilijus Matuševas | Soviet Union | Volleyball | 1968 Summer | |
| Eduard Matusevich | Speed skating | 1964 Winter, 1968 Winter | |
| Konstantin Matusevich | Israel | Athletics | 1996 Summer, 2000 Summer | |
| Dalia Matusevičienė | Soviet Union | 1988 Summer | |
| Edis Matusevičius | Lithuania | 2020 Summer, 2024 Summer | |
| Igor Matushkin | Belarus | Ice hockey | 1998 Winter, 2002 Winter | |
| Bogumiła Matusiak | Poland | Road cycling | 2004 Summer | |
| Wojciech Matusiak | Track cycling | 1968 Summer | |
| Ilidio Matusse | Mozambique | Swimming | 2000 Summer | |
| Marek Matuszek | Slovakia | Judo | 1996 Summer, 2000 Summer | |
| Lucyna Matuszna | Poland | Field hockey | 1980 Summer | |
| Włodzimierz Matuszyński | 1972 Summer | |
| Juan Matute | Spain | Equestrian dressage | 1988 Summer, 1992 Summer, 1996 Summer | |
| Vicente Matute | Venezuela | Boxing | 1952 Summer | |
| Grigoriy Matuzkov | Kazakhstan | Swimming | 2000 Summer | |
| Nicholas Matveev | Canada | Canoe sprint | 2020 Summer, 2024 Summer | |
| Polina Matveeva [ Wikidata ] | Russian Olympic Committee | Volleyball | 2020 Summer | |
| Gregory Matveieff | Great Britain | Diving | 1924 Summer | |
| Nikolai Matvejev | Soviet Union | Track cycling | 1952 Summer | |
| Aleksey Matveyev | Swimming | 1988 Summer | |
| Boris Matveyev | Athletics | 1952 Summer, 1956 Summer | |
| Dmitry Matveyev | Canoe sprint | 1968 Summer | |
| Dmitry Matveyev | Russia | Nordic combined | 2006 Winter | |
| Ivan Matveyev | Soviet Union | Sailing | 1952 Summer, 1956 Summer | |
| Nikolay Matveyev | 1952 Summer | |
| Sergey Matveyev | Russia | Rowing | 1996 Summer, 2000 Summer, 2004 Summer | |
| Viktor Matveyev | Soviet Union | Equestrian jumping | 1968 Summer, 1972 Summer | |
| Inna Matveyeva | Kazakhstan | Volleyball | 2008 Summer | |
| Lyudmila Matveyeva | Soviet Union, Unified Team | Athletics | 1988 Summer, 1992 Summer | |
| Natalya Matveyeva | Russia | Cross country skiing | 2006 Winter, 2014 Winter | |
| Yelizaveta Matveyeva | Kazakhstan | Athletics | 2024 Summer | |
| Volodymyr Matviichuk | Ukraine | Boxing | 2016 Summer | |
| Vasyl Matviychuk | Athletics | 2008 Summer | |
| Ihor Matviienko | Sailing | 1996 Summer, 2000 Summer, 2004 Summer | |
| Sergey Matviyenko | Kazakhstan | Wrestling | 1996 Summer, 2000 Summer | |
| Viktor Matviyenko | Soviet Union | Football | 1976 Summer | |
| Serhiy Matvyeyev | Ukraine | Track cycling, Road cycling | 1996 Summer, 2000 Summer, 2004 Summer | |
| Zbigniew Matwiejew | Poland | Fencing | 1976 Summer | |
| Auguszta Mátyás | Hungary | Handball | 1996 Summer | |
| Jordan Matyas | United States | Rugby sevens | 2020 Summer | |
| Michał Matyas | Poland | Football | 1936 Summer | |
| Phumzile Matyhila | South Africa | Boxing | 2000 Summer | |
| Przemysław Matyjaszek | Poland | Judo | 2004 Summer, 2008 Summer | |
| Tomáš Matykiewicz | Czech Republic | Weightlifting | 2004 Summer | |
| Andrzej Matysiak | Poland | Canoe sprint | 1972 Summer | |
| Kay Matysik | Germany | Beach volleyball | 2012 Summer | |
| Nikolay Matyukhin | Russia | Athletics | 1996 Summer, 2000 Summer | |
| Nadezhda Matyukhina | Soviet Union | Swimming | 1972 Summer | |
| Yelena Matyushenko | Diving | 1980 Summer | |
| Barbara Matz | Austria | Sailing | 2020 Summer | |
| Evelyn Matz | East Germany | Handball | 1976 Summer, 1980 Summer | |
| Josef Matz | Austria | Field hockey | 1952 Summer | |
| Michael R. Matz | United States | Equestrian jumping | 1976 Summer, 1992 Summer, 1996 Summer | |
| Heli Matzdorf | West Germany | Swimming | 1968 Summer | |
| Lucas Matzerath | Germany | 2020 Summer, 2024 Summer | |
| Liesbeth Mau Asam | Netherlands | Short track speed skating | 2006 Winter, 2010 Winter | |
| Klara Maučec | Slovenia | Sailing | 2000 Summer, 2004 Summer, 2008 Summer | |
| Bernard Mauchien | Belgium | Field hockey | 1976 Summer | |
| Jacques Mauchien | France | 1960 Summer | |
| Ado Maude | Nigeria | Athletics | 1988 Summer | |
| Jindřich Maudr | Czechoslovakia | Wrestling | 1928 Summer, 1932 Summer | |
| Algernon Maudslay | Great Britain | Sailing | 1900 Summer | |
| Tessa Maud | United States | Snowboarding | 2022 Winter | |
| Georges Mauduit | France | Alpine skiing | 1968 Winter | |
| Michael Maue | West Germany | Road cycling | 1984 Summer | |
| Paul Maue | Germany | 1952 Summer | |
| Albert Mauer | Poland | Ice hockey | 1932 Winter | |
| Frank Mauer | Germany | 2018 Winter | |
| Renata Mauer | Poland | Shooting | 1992 Summer, 1996 Summer, 2000 Summer, 2004 Summer | |
| Gisela Mauermayer | Germany | Athletics | 1936 Summer | |
| Erich Mauff | South Africa | Rowing | 1992 Summer | |
| George Maughan | Canada | Boxing | 1932 Summer | |
| Jules Maujean | France | Shooting | 1920 Summer | |
| Alexander Maunder | Great Britain | 1908 Summer, 1912 Summer | |
| Maria Maunder | Canada | Rowing | 1996 Summer | |
| Jürgen Maune | East Germany | Volleyball | 1972 Summer | |
| Maung Maung Tin | Myanmar | Football | 1972 Summer | |
| Bawa Maung | Boxing | 1964 Summer | |
| Maung Win Maung | Weightlifting | 1948 Summer | |
| Nil Tun Maung | 1952 Summer, 1956 Summer, 1960 Summer | |
| Richard Maunier | France | Athletics | 2008 Summer | |
| Brian Maunsell | New Zealand | Boxing | 1964 Summer | |
| Brian Maunsell | Field hockey | 1964 Summer | |
| Pierre de Maupeou d'Ableiges | France | Equestrian jumping | 1948 Summer | |
| Alessia Maurelli | Italy | Rhythmic gymnastics | 2016 Summer, 2020 Summer, 2024 Summer | |
| Angela Maurer | Germany | Marathon swimming | 2008 Summer, 2012 Summer | |
| Antonio Maurer | Mexico | Equestrian jumping | 2000 Summer | |
| Claude Maurer | Switzerland | Sailing | 2000 Summer | |
| Friedrich Maurer | Austria | Handball | 1936 Summer | |
| Hans Maurer | Germany | Bobsleigh | 1964 Winter | |
| Heinz Maurer | Switzerland | Sailing | 1980 Summer | |
| José Maurer | Mexico | Equestrian jumping | 1992 Summer | |
| Lea Maurer | United States | Swimming | 1992 Summer | |
| Michel Maurer | Luxembourg | Boxing | 1924 Summer | |
| René Maurer | Switzerland | Athletics | 1960 Summer | |
| Saskia Maurer | Ice hockey | 2022 Winter | |
| Stefan Maurer | Road cycling | 1984 Summer | |
| Walter Maurer | United States | Wrestling | 1920 Summer | |
| Amélie Mauresmo | France | Tennis | 2000 Summer, 2004 Summer | |
| Carolina Mauri | Costa Rica | Swimming | 1988 Summer | |
| Melcior Mauri | Spain | Road cycling | 1996 Summer | |
| Florian Maurice | France | Football | 1996 Summer | |
| Luanne Maurice | Mauritius | Swimming | 1992 Summer | |
| Pauline Maurice | Canada | Softball | 1996 Summer | |
| Mauricio Álvarez de las Asturias Bohorques, 4th Duke of Gor | Spain | Fencing | 1900 Summer | |
| Nacissela Maurício | Angola | Basketball | 2012 Summer | |
| Marissa Maurin | Chile | Sailing | 1992 Summer | |
| Maurine | Brazil | Football | 2008 Summer, 2012 Summer | |
| Kristaps Mauriņš | Latvia | Luge | 2014 Winter | |
| Édouard Mauris | Switzerland | Field hockey | 1928 Summer | |
| Mário Maurity | Brazil | Shooting | 1920 Summer | |
| Liall Mauritz [ Wikidata ] | South Africa | Baseball | 2000 Summer | |
| Matthias Mauritz | Germany | Football | 1952 Summer, 1956 Summer | |
| Merten Mauritz | Austria | Fencing | 1992 Summer | |
| Mauro | Brazil | Football | 1952 Summer | |
| Massimo Mauro | Italy | 1988 Summer | |
| Antonio Maurogiovanni | Rowing | 1988 Summer, 1992 Summer | |
| Harrison Maurus | United States | Weightlifting | 2020 Summer | |
| Margaret Maury | France | Athletics | 2004 Summer | |
| Serge Maury | Sailing | 1972 Summer, 1976 Summer | |
| Jacques Maus | Belgium | Bobsleigh | 1932 Winter | |
| Jannis Maus [ Wikidata ] | Germany | Sailing | 2024 Summer | |
| Julius Maus | Road cycling | 1932 Summer | |
| François Mautin | France | Ice hockey | 1928 Winter | |
| Georges Mauvezain | Artistic gymnastics | 1900 Summer | |
| Dikubenga Mavatiku | Democratic Republic of the Congo | Judo | 1992 Summer | |
| Robert Maveau | Belgium | Track cycling | 1972 Summer | |
| Dušan Mavec | Yugoslavia | Equestrian dressage | 1984 Summer | |
| Marie Mävers | Germany | Field hockey | 2012 Summer, 2016 Summer | |
| Andrew Mavis | Canada | Basketball | 2000 Summer | |
| Umyar Mavlikhanov | Soviet Union | Fencing | 1960 Summer, 1964 Summer, 1968 Summer | |
| Vasilios Mavrapostolos | Greece | Athletics | 1948 Summer | |
| Mojca Mavrič | Slovenia | Artistic gymnastics | 2000 Summer | |
| Savvas Mavridis | Greece | Water polo | 1920 Summer | |
| Victoria Mavridou | Weightlifting | 2008 Summer | |
| Fotis Mavriplis | Alpine skiing | 1948 Winter | |
| Radoslava Mavrodieva | Bulgaria | Athletics | 2012 Summer, 2016 Summer | |
| Eleftheria Mavrogeni | Greece | Handball | 2004 Summer | |
| Spyridon Mavrogiorgos | Swimming | 1936 Summer | |
| Theodore Mavrogordato | Great Britain | Tennis | 1912 Summer | |
| Vasilios Mavroidis | Greece | Athletics | 1948 Summer, 1952 Summer | |
| Frangiskos Mavrommatis | Shooting | 1908 Summer, 1912 Summer | |
| Nikolaos Mavrommatis | 2012 Summer, 2020 Summer | |
| George Mavrotas | Water polo | 1984 Summer, 1988 Summer, 1992 Summer, 1996 Summer, 2000 Summer | |
| Željko Mavrović | Yugoslavia, Croatia | Boxing | 1988 Summer, 1992 Summer | |
| Tamara Mavsar | Slovenia | Handball | 2024 Summer | |
| Edward Maw | Great Britain | Swimming | 1924 Summer | |
| Yuki Mawatari | Japan | 1928 Summer | |
| Sarah Mawby | Great Britain | Fencing | 1992 Summer | |
| Sharlene Mawdsley | Ireland | Athletics | 2024 Summer | |
| Bassa Mawem | France | Sport climbing | 2020 Summer, 2024 Summer | |
| Mickaël Mawem | 2020 Summer | |
| Kouty Mawenh | Liberia | Athletics | 1996 Summer, 2000 Summer | |
| Sunday Maweni | Botswana | 1988 Summer | |
| Gary Mawer | Ireland | Canoe sprint | 1996 Summer, 2000 Summer | |
| Safruddin Mawi | Indonesia | Archery | 1988 Summer | |
| Evelyn Mawuli | Japan | Basketball | 2020 Summer, 2024 Summer | |
| Stephanie Mawuli | 3x3 basketball, Basketball | 2020 Summer, 2024 Summer | |
| Philipp Max | Germany | Football | 2016 Summer | |
| František Maxa | Czechoslovakia | Shooting | 1952 Summer, 1956 Summer | |
| Marcel Maxa | Czech Republic | Alpine skiing | 1998 Winter | |
| John Maxey | Great Britain | Rowing | 1988 Summer | |
| Leslie Maxie | United States | Athletics | 1988 Summer | |
| Marinela Maxim | Romania | Rowing | 1976 Summer | |
| Lucian Maxinianu | Weightlifting | 1996 Summer | |
| Édouard Max-Robert | France | Athletics | 1928 Summer | |
| Andreas Maxsø | Denmark | Football | 2016 Summer | |
| Louis Maxson | United States | Archery | 1904 Summer | |
| Victoria Max-Theurer | Austria | Equestrian dressage | 2004 Summer, 2008 Summer, 2012 Summer, 2016 Summer, 2024 Summer | |
| David Maxwell | Great Britain | Rowing | 1972 Summer, 1976 Summer | |
| Fleur Maxwell | Luxembourg | Figure skating | 2006 Winter | |
| Gavin Maxwell | Canada | Canoe sprint | 1996 Summer | |
| John Maxwell | United States | Golf | 1904 Summer | |
| John Maxwell | Australia | Shooting | 1988 Summer, 1996 Summer | |
| Kevin Maxwell | Canada | Ice hockey | 1980 Winter | |
| Kyle Maxwell | Barbados | Judo | 2012 Summer | |
| Neville Maxwell | Ireland | Rowing | 1996 Summer, 2000 Summer | |
| Robert Maxwell | United States | Athletics | 1928 Summer | |
| Sammie Maxwell | New Zealand | Cycling mountain bike | 2024 Summer | |
| Tanith Maxwell | South Africa | Athletics | 2012 Summer | |
| Warren Maxwell | Great Britain | Figure skating | 1976 Winter | |
| Stephanie Maxwell-Pierson | United States | Rowing | 1988 Summer, 1992 Summer | |
| Adam May | Great Britain | Sailing | 2000 Summer | |
| Attila May | Hungary | Fencing | 1968 Summer | |
| Axel May | West Germany | Sailing | 1968 Summer, 1976 Summer, 1984 Summer | |
| Butch May | United States | Volleyball | 1968 Summer | |
| Carey May | Ireland | Athletics | 1984 Summer | |
| Elizabeth May | Luxembourg | Triathlon | 2004 Summer, 2008 Summer | |
| Ernest May | Great Britain | Athletics | 1908 Summer | |
| Fiona May | Great Britain, Italy | 1988 Summer, 1992 Summer, 1996 Summer, 2000 Summer, 2004 Summer | |
| Friedrich May | West Germany | Sailing | 1972 Summer | |
| Gareth May | South Africa | Water polo | 2020 Summer | |
| Gerd May | East Germany | Fencing | 1980 Summer | |
| Hellmut May | Austria | Figure skating | 1936 Winter, 1948 Winter | |
| James May | Great Britain | Artistic gymnastics | 1992 Summer | |
| Jürgen May | Germany, West Germany | Athletics | 1964 Summer, 1972 Summer | |
| Karl-Maria May | Austria | Art competitions | 1936 Summer, 1948 Summer | |
| Kristina May | Canada | Beach volleyball | 2016 Summer | |
| Márcio May | Brazil | Road cycling | 1992 Summer, 1996 Summer, 2004 Summer | |
| Nicolas May | Luxembourg | Football | 1948 Summer | |
| Norman May | Canada | Wrestling | 1948 Summer | |
| Percy May | Great Britain | Artistic gymnastics | 1948 Summer | |
| Peter May | Weightlifting | 1988 Summer, 1992 Summer | |
| Phil May | Australia | Athletics | 1968 Summer | |
| Scott May | United States | Basketball | 1976 Summer | |
| Torsten May | Germany | Boxing | 1992 Summer | |
| William W. May | United States | Athletics | 1908 Summer | |
| Willie May | 1960 Summer | |
| Cándido Maya | Cuba | Fencing | 2000 Summer, 2004 Summer | |
| Carlos Maya | Venezuela | Road cycling | 1992 Summer, 1996 Summer, 2000 Summer | |
| Jorge Maya | Uruguay | Basketball | 1964 Summer | |
| Vicente Mayagoitia | Mexico | Artistic gymnastics | 1932 Summer | |
| Janete Mayal | Brazil | Athletics | 1992 Summer | |
| Freddy Mayala | Republic of the Congo | Swimming | 2024 Summer | |
| Sonallis Mayan | Cuba | Taekwondo | 2000 Summer | |
| Brian Mayanja | Uganda | Boxing | 2004 Summer | |
| Jimmy Mayanja | Sweden | 1988 Summer | |
| Marjorie Mayans | France | Rugby sevens | 2016 Summer | |
| John Mayasich | United States | Ice hockey | 1956 Winter, 1960 Winter | |
| Albert Mayaud | France | Swimming, Water polo | 1920 Summer, 1924 Summer | |
| Aanantha Sambu Mayavo | Malaysia | Field hockey | 1992 Summer | |
| Anthuan Maybank | United States | Athletics | 1996 Summer | |
| George Mayberry | Great Britain | 1908 Summer | |
| Myra Mayberry-Wilkinson | Puerto Rico | 1992 Summer, 1996 Summer | |
| Des Maybery | South Africa | Rowing | 1948 Summer | |
| Betty-Jean Maycock | United States | Artistic gymnastics | 1960 Summer | |
| Renae Maycock | Australia | Volleyball | 2000 Summer | |
| Maycon | Brazil | Football | 2000 Summer, 2004 Summer, 2008 Summer | |
| Adrian Maycsell | Mexico | Field hockey | 1968 Summer | |
| Maryna Maydanova | Ukraine | Athletics | 2004 Summer | |
| Albert Mayer | France | Canoe sprint | 1968 Summer | |
| Alexander Mayer | West Germany | Swimming | 1988 Summer | |
| Alf Mayer | Canada | Shooting | 1968 Summer, 1972 Summer | |
| Bärbel Mayer | Germany | Athletics | 1956 Summer | |
| Bronwyn Mayer | Australia | Water polo | 2000 Summer, 2004 Summer | |
| Charles Mayer | United States | Boxing | 1904 Summer | |
| Chris Mayer | Great Britain | Field hockey | 1996 Summer | |
| Christian Mayer | Austria | Alpine skiing | 1992 Winter, 1994 Winter, 1998 Winter | |
| Derek Mayer | Canada | Ice hockey | 1994 Winter | |
| Domenika Mayer [ Wikidata ] | Germany | Athletics | 2024 Summer | |
| Eugenio Mayer | Italy | Cross country skiing | 1964 Winter | |
| Florian Mayer | Germany | Tennis | 2004 Summer | |
| Gábor Mayer | Hungary | Biathlon, Cross country skiing | 1984 Winter, 1988 Winter, 1992 Winter | |
| George Mayer | United States | Artistic gymnastics | 1904 Summer | |
| Gerhard Mayer | Austria | Athletics | 2008 Summer, 2012 Summer | |
| Helene Mayer | Germany | Fencing | 1928 Summer, 1932 Summer, 1936 Summer | |
| Helmut Mayer | Austria | Alpine skiing | 1988 Winter | |
| Horst Mayer | East Germany | Wrestling | 1968 Summer, 1972 Summer | |
| Jean Mayer | France | Athletics | 1976 Summer | |
| Joanne Mayer | Canoe sprint | 2012 Summer | |
| Juergen Mayer | Austria | Bobsleigh | 2010 Winter | |
| Julia Mayer [ Wikidata ] | Athletics | 2024 Summer | |
| Kevin Mayer | France | 2012 Summer, 2016 Summer, 2020 Summer | |
| Lisa Mayer | Germany | 2016 Summer, 2024 Summer | |
| Marc Mayer | Austria | Cross country skiing | 2002 Winter | |
| Matthias Mayer | Alpine skiing | 2014 Winter, 2018 Winter, 2022 Winter | |
| Mihály Mayer | Hungary | Water polo | 1956 Summer, 1960 Summer, 1964 Summer, 1968 Summer | |
| Mikaela Mayer | United States | Boxing | 2016 Summer | |
| Mona Mayer [ Wikidata ] | Germany | Athletics | 2024 Summer | |
| Olaf Mayer | Austria | Boxing | 1984 Summer | |
| Rachel Mayer | United States | Figure skating | 1992 Winter | |
| Richard Mayer [ Wikidata ] | Austria | Rowing | 1912 Summer | |
| Ruimondo Mayer | Portugal | Fencing | 1920 Summer, 1924 Summer | |
| Sebastian Mayer | Germany | Rowing | 1996 Summer, 2000 Summer | |
| Sébastien Mayer | France | Canoe sprint | 1992 Summer | |
| Tanja Mayer | Switzerland | Bobsleigh | 2014 Winter | |
| Theodor Mayer | Austria | Art competitions | 1928 Summer, 1936 Summer | |
| Travis Mayer | United States | Freestyle skiing | 2002 Winter, 2006 Winter | |
| Victoria Mayer | Argentina | Volleyball | 2020 Summer | |
| Christian Mayerhöfer | Germany | Field hockey | 1992 Summer, 1996 Summer, 2000 Summer | |
| Veronika Mayerhofer | Austria | Cross country skiing | 2014 Winter | |
| George Mayer-Marton | Art competitions | 1928 Summer | |
| John Mayers | Barbados | Athletics | 1984 Summer | |
| Natasha Mayers | Saint Vincent and the Grenadines | 2000 Summer, 2004 Summer | |
| Raymond Mayers | Australia | Water polo | 1984 Summer, 1988 Summer, 1992 Summer | |
| Gayle Mayes | Canoe sprint | 1992 Summer | |
| Jane Mayes | Great Britain | Handball | 2012 Summer | |
| Stuart Mayes | Field hockey | 1960 Summer | |
| Alexander Mayeta | Cuba | Baseball | 2008 Summer | |
| Margarita Mayeta | Volleyball | 1972 Summer | |
| Bernard Mayeur | France | Basketball | 1960 Summer | |
| Rosemary Mayglothling | Great Britain | Rowing | 1980 Summer | |
| Donna Mayhew | United States | Athletics | 1988 Summer, 1992 Summer | |
| Rick Mayhew | South Africa | Sailing | 1992 Summer, 1996 Summer | |
| Erhard Mayke | Germany | Speed skating | 1928 Winter | |
| Farouk Mayman | South Africa | Water polo | 2020 Summer | |
| Andrew Maynard | United States | Boxing | 1988 Summer | |
| Michael Maynard | Great Britain | Sailing | 1968 Summer | |
| Mujaahid Maynard | United States | Wrestling | 1996 Summer | |
| Edith Mayne | Great Britain | Swimming | 1928 Summer | |
| William Maynes | Canada | Athletics | 1924 Summer | |
| Carlos Mayo | Spain | 2020 Summer | |
| François Mayo | Cameroon | Boxing | 1988 Summer | |
| Gilmar Mayo | Colombia | Athletics | 1996 Summer, 2000 Summer | |
| Job Mayo | Philippines | Wrestling | 1964 Summer | |
| Richard W. Mayo | United States | Modern pentathlon | 1928 Summer, 1932 Summer | |
| John Mayock | Great Britain | Athletics | 1996 Summer, 2000 Summer, 2004 Summer | |
| Miguel Mayol | Argentina | Rowing | 2012 Summer | |
| Freddy Mayola | Cuba | Athletics | 2000 Summer | |
| Carlos Mayor | Argentina | Football | 1988 Summer | |
| Dave Mayor | United States | Weightlifting | 1936 Summer | |
| Gaston Mayor | France | Boxing | 1932 Summer | |
| Lesyani Mayor | Cuba | Athletics | 2012 Summer | |
| Enriqueta Mayora | Mexico | Fencing | 1948 Summer | |
| Julio Mayora | Venezuela | Weightlifting | 2020 Summer, 2024 Summer | |
| Jordi Mayoral | Spain | Athletics | 1996 Summer | |
| Gaston Mayordomo | France | 1948 Summer | |
| Pedro Mayorga | Argentina | Equestrian jumping | 1956 Summer | |
| Alexander Mayorov | Soviet Union | Nordic combined | 1980 Winter, 1984 Winter | |
| Boris Mayorov | Ice hockey | 1964 Winter, 1968 Winter | |
| Yevgeni Mayorov | 1964 Winter | |
| Albina Mayorova | Russia | Athletics | 2004 Summer, 2012 Summer | |
| Tim Mayotte | United States | Tennis | 1988 Summer | |
| Abdullah Mayouf [ Wikidata ] | Kuwait | Diving | 1980 Summer | |
| André Mayounga | Central African Republic | Judo | 1992 Summer | |
| Andrea Mayr | Austria | Athletics | 2012 Summer, 2016 Summer | |
| Antonia Mayr | Luge | 1972 Winter, 1976 Winter | |
| Benedikt Mayr | Germany | Freestyle skiing | 2014 Winter | |
| Camilo Mayr | Archery | 2012 Summer | |
| Hans Mayr | Austria | Canoe sprint | 1976 Summer, 1980 Summer | |
| Heinz Mayr | West Germany | Athletics | 1972 Summer | |
| Hermann Mayr | Austria | Cross country skiing | 1956 Winter, 1964 Winter | |
| Jörg Mayr | Germany | Ice hockey | 1992 Winter, 1994 Winter, 2002 Winter | |
| Marco Mayr | Switzerland | Athletics | 1984 Summer | |
| Nicola Mayr | Italy | Speed skating | 2002 Winter | |
| Rudolf Mayr | Austria | Sailing | 1976 Summer | |
| Verena Mayr | Athletics | 2020 Summer | |
| Otto Mayregger | Luge | 1988 Winter | |
| Wolfgang Mayrhofer | Sailing | 1980 Summer | |
| Ida Mayrin | Israel | Rhythmic gymnastics | 2016 Summer | |
| Karin Mayr-Krifka | Austria | Athletics | 2000 Summer, 2004 Summer | |
| Charles Mays | United States | 1968 Summer | |
| Steven Mays | Wrestling | 2000 Summer | |
| Robert Maysack | Artistic gymnastics | 1904 Summer | |
| Jorge Maysonet | Puerto Rico | Boxing | 1984 Summer | |
| Ihar Maystrenka | Soviet Union | Rowing | 1980 Summer | |
| Iryna Maystruk | Ukraine | Swimming | 2004 Summer | |
| Misty May-Treanor | United States | Beach volleyball | 2000 Summer, 2004 Summer, 2008 Summer, 2012 Summer | |
| Floyd Mayweather Jr. | Boxing | 1996 Summer | |
| Diana Maza | Ecuador | Judo | 2004 Summer | |
| Rubén Maza | Venezuela | Athletics | 1996 Summer | |
| Milan Mazáč | Slovakia | Wrestling | 1996 Summer | |
| Ali Mazaheri | Iran | Boxing | 2008 Summer, 2012 Summer | |
| Antoine Mazairac | Netherlands | Track cycling | 1928 Summer | |
| Andrés Mazali | Uruguay | Football | 1924 Summer, 1928 Summer | |
| Viktor Mazanov | Soviet Union | Swimming | 1964 Summer, 1968 Summer, 1972 Summer | |
| Sándor Mazány | Hungary | Alpine skiing | 1948 Winter | |
| Vasilis Mazarakis | Greece | Tennis | 2004 Summer | |
| Rocael Mazariegos | Guatemala | Football | 1988 Summer | |
| Chris Mazdzer | United States | Luge | 2010 Winter, 2014 Winter, 2018 Winter, 2022 Winter | |
| Michael Maze | Denmark | Table tennis | 2000 Summer, 2004 Summer, 2008 Summer, 2012 Summer | |
| Paul Maze | Great Britain | Art competitions | 1948 Summer | |
| Tina Maze | Slovenia | Alpine skiing | 2002 Winter, 2006 Winter, 2010 Winter, 2014 Winter | |
| Jacqueline Mazéas | France | Athletics | 1948 Summer | |
| Rasa Mažeikytė | Lithuania | Track cycling | 1996 Summer, 2000 Summer | |
| Olivier, Comte de la Mazeliere [ Wikidata ] | France | Equestrian driving | 1900 Summer | |
| Axel Mazella [ Wikidata ] | Sailing | 2024 Summer | |
| Raúl Mazerati | Argentina | Rowing | 1972 Summer | |
| Wijda Mazereeuw | Netherlands | Swimming | 1972 Summer, 1976 Summer | |
| Gabi Mazetto [ Wikidata ] | Brazil | Skateboarding | 2024 Summer | |
| Hanna Mazgunova | Belarus | Athletics | 2008 Summer | |
| Božena Mažgutová | Czechoslovakia | Handball | 1988 Summer | |
| Ayman Mazhar | Egypt | Shooting | 2000 Summer | |
| Bilal Mazhar | Football | 2024 Summer | |
| Mirna Mazić | Croatia | Basketball | 2012 Summer | |
| Ivan Bruno Maziero | Brazil | Handball | 1992 Summer, 1996 Summer, 2004 Summer | |
| Oleksiy Mazikin | Ukraine | Boxing | 2000 Summer, 2004 Summer | |
| Pierre Mazille | France | Athletics | 1948 Summer | |
| Maria Marinela Mazilu | Romania | Skeleton | 2010 Winter, 2014 Winter, 2018 Winter | |
| Viktor Mazin | Soviet Union | Weightlifting | 1980 Summer | |
| Maria Mazina | Russia | Fencing | 1996 Summer, 2000 Summer | |
| Pierre Mazior [ Wikidata ] | France | Boxing | 1908 Summer | |
| Dimitrios Mazis | Greece | Water polo | 2000 Summer, 2004 Summer, 2008 Summer | |
| Svitlana Maziy | Soviet Union, Ukraine | Rowing | 1988 Summer, 1996 Summer, 2000 Summer, 2004 Summer | |
| Frank Maziya | Eswatini | Athletics | 1988 Summer | |
| Gholamhossein Mazloumi | Iran | Football | 1976 Summer | |
| Konstantin Maznikov | Bulgaria | 1924 Summer | |
| Carlos Mazo | Colombia | Shooting | 1984 Summer | |
| Jorge del Mazo | Argentina | 1924 Summer | |
| Jan Mazoch | Czech Republic | Ski jumping | 2002 Winter, 2006 Winter | |
| Christina Sergejewna Mazokina [ Wikidata ] | Russian Olympic Committee | Cross country skiing | 2022 Winter | |
| Raúl Mazorra | Cuba | Athletics | 1948 Summer, 1952 Summer | |
| Hakim Mazou | Republic of the Congo | 1996 Summer | |
| Alena Mazouka | Belarus | 1996 Summer | |
| Sarah Myriam Mazouz | Gabon | Judo | 2016 Summer, 2020 Summer | |
| Andrey Mazovka | Soviet Union | Sailing | 1952 Summer, 1956 Summer | |
| Jacques Mazoyer | France | Shooting | 1936 Summer, 1948 Summer, 1952 Summer, 1956 Summer | |
| Hodei Mazquiarán Uría | Spain | Track cycling | 2012 Summer | |
| Takahiro Mazuka | Japan | Athletics | 1996 Summer | |
| Sakti Mazumdar | India | Boxing | 1952 Summer | |
| Andrei Mazunov | Soviet Union, Unified Team, Russia | Table tennis | 1988 Summer, 1992 Summer, 1996 Summer | |
| Dmitry Mazunov | Unified Team, Russia | 1992 Summer, 1996 Summer, 2004 Summer, 2008 Summer | |
| Raimundas Mažuolis | Soviet Union, Lithuania | Swimming | 1988 Summer, 1992 Summer, 1996 Summer | |
| Gyula Mazur | Hungary | Road cycling | 1912 Summer | |
| Henryk Mazur | Poland | Wrestling | 1976 Summer, 1980 Summer | |
| Kazimierz Mazur | Modern pentathlon | 1960 Summer | |
| Nikola Mazur [ Wikidata ] | Short track speed skating | 2022 Winter | |
| Viktoria Mazur | Ukraine | Rhythmic gymnastics | 2012 Summer | |
| Vladyslav Mazur | Athletics | 2020 Summer | |
| Josef Mazura | Czechoslovakia | Football | 1980 Summer | |
| Ivan Vladimir Mažuranić | Yugoslavia | Fencing | 1936 Summer | |
| Dmytro Mazurchuk | Ukraine | Nordic combined | 2022 Winter | |
| Leon Mazurek | Poland | Wrestling | 1928 Summer | |
| Zuzanna Mazurek | Swimming | 2008 Summer | |
| Tatsiana Mazurkevich | Belarus | Modern pentathlon | 2004 Summer | |
| Hermann Mazurkiewitsch | Austria | Boxing | 1948 Summer | |
| Volha Mazuronak | Belarus | Athletics | 2016 Summer, 2020 Summer | |
| Hilda Mazúrová | Czechoslovakia | Volleyball | 1968 Summer, 1972 Summer | |
| Mārtiņš Mazūrs | Latvia | Road cycling | 1936 Summer | |
| Rūdolfs Mazūrs [ Wikidata ] | Art competitions | 1936 Summer | |
| Maksym Mazuryk | Ukraine | Athletics | 2008 Summer, 2012 Summer | |
| Alain Mazza | France | Ice hockey | 1968 Winter | |
| Giorgio Mazza | Italy | Athletics | 1964 Summer | |
| Marino Mazzacurati | Art competitions | 1948 Summer | |
| Giovanni Mazzalupi | Field hockey | 1960 Summer | |
| Giuseppe Mazzanti | Baseball | 2004 Summer | |
| Alessandro Mazzara | Skateboarding | 2020 Summer, 2024 Summer | |
| Mirko Mazzari | Swimming | 1996 Summer, 2000 Summer | |
| Serafino Mazzarocchi | Artistic gymnastics | 1912 Summer | |
| Marcos Mazzaron | Brazil | Road cycling | 1984 Summer, 1988 Summer | |
| Annamaria Mazzetti | Italy | Triathlon | 2012 Summer, 2016 Summer | |
| Riccardo Mazzetti | Shooting | 2016 Summer, 2020 Summer, 2024 Summer | |
| Agustín Mazzilli | Argentina | Field hockey | 2012 Summer, 2016 Summer, 2020 Summer, 2024 Summer | |
| Guido Mazzinghi | Italy | Boxing | 1952 Summer | |
| Adolfo Mazzini | Basketball | 1936 Summer | |
| José Mazzini | Peru | Road cycling, Track cycling | 1936 Summer | |
| Mary Mazzio | United States | Rowing | 1992 Summer | |
| Mary Mazzio-Manson | 2024 Summer | |
| Lucas Mazzo | Brazil | Athletics | 2020 Summer | |
| Fausto Mazzoleni | Switzerland | Ice hockey | 1988 Winter | |
| Evaristo Mazzón | Uruguay | Boxing | 1984 Summer | |
| Hervé Mazzon | France | Volleyball | 1988 Summer | |
| Angelo Mazzoni | Italy | Fencing | 1980 Summer, 1984 Summer, 1988 Summer, 1992 Summer, 1996 Summer, 2000 Summer | |
| Roberto Mazzoni | Shooting | 1960 Summer | |
| Massimiliano Mazzucchi | Diving | 2000 Summer, 2004 Summer | |
| Stéphane N'Zue Mba | Gabon | Boxing | 2000 Summer | |
| Brigitte Mbabi [ Wikidata ] | Democratic Republic of the Congo | 2024 Summer | |
| Stella Mbachu | Nigeria | Football | 2000 Summer, 2004 Summer, 2008 Summer | |
| Hortence Mballa Atangana | Cameroon | Judo | 2016 Summer, 2020 Summer | |
| Sylvie Mballa Éloundou | Athletics | 1996 Summer | |
| Kaninga Mbambi | Democratic Republic of the Congo | Basketball | 1996 Summer | |
| Modeste M'bami | Cameroon | Football | 2000 Summer | |
| Phumelela Mbande | South Africa | Field hockey | 2020 Summer | |
| Martial Mbandjock | France | Athletics | 2008 Summer | |
| Johnson Mbangiwa | Botswana | 1984 Summer | |
| Françoise Mbango Etone | Cameroon | 2000 Summer, 2004 Summer, 2008 Summer | |
| Ifeoma Mbanugo | Nigeria | 1984 Summer | |
| Lameck Mbao | Zambia | Boxing | 1988 Summer | |
| Chebbi Mbarek | Tunisia | Volleyball | 1984 Summer | |
| Selim Mbareki | 2020 Summer | |
| Ydrissa M'Barke | France | Athletics | 2008 Summer | |
| Chahnez M'barki | Tunisia | Judo | 2008 Summer | |
| Luc Mbassi | Cameroon | Football | 1984 Summer | |
| Amadou M'Baye | Senegal | Athletics | 1988 Summer, 1992 Summer | |
| Hamidou M'Baye | 1988 Summer, 1996 Summer | |
| Malik M'Baye | France | 1952 Summer | |
| Charles Mbazira | Uganda | 1984 Summer | |
| Richelle Soppi Mbella | Cameroon | Judo | 2024 Summer | |
| Mame Maty Mbengue | Senegal | Basketball | 2000 Summer | |
| Moussa M'Bengue | 1980 Summer | |
| Papa M'Bengue | Judo | 1976 Summer | |
| Pasi Mbenza | Democratic Republic of the Congo | Road cycling | 1988 Summer | |
| Jean-Pierre Mbereke-Baban | Cameroon | Boxing | 1980 Summer, 1984 Summer | |
| Stéphane Mbia | Football | 2008 Summer | |
| Bienvenu Mbida | Republic of the Congo | Judo | 1984 Summer | |
| Christian M'billi | France | Boxing | 2016 Summer | |
| Samson Mbingui | Gabon | Football | 2012 Summer | |
| Ejnar Møbius [ Wikidata ] | Denmark | Artistic gymnastics | 1912 Summer | |
| Alba Mbo Nchama | Equatorial Guinea | Athletics | 2020 Summer | |
| Ernest Atangana Mboa | Cameroon | Boxing | 1996 Summer | |
| Gabriel M'Boa | Central African Republic | Athletics | 1968 Summer | |
| Griedge Mbock Bathy | France | Football | 2016 Summer, 2024 Summer | |
| M'Bagnick M'Bodj | Senegal | Judo | 1972 Summer | |
| Kara Mbodji | Football | 2012 Summer | |
| Rachael Mbogo | Kenya | Rugby sevens | 2016 Summer | |
| André Kimbu Mboma | Democratic Republic of the Congo | Boxing | 1984 Summer | |
| Christine Mboma | Namibia | Athletics | 2020 Summer | |
| Patrick Mboma | Cameroon | Football | 2000 Summer | |
| Ponciano Mbomio | Equatorial Guinea | Athletics | 1996 Summer | |
| Mamute Mbonga | Democratic Republic of the Congo | Judo | 1992 Summer | |
| Guy M'Bongo | Central African Republic | Basketball | 1988 Summer | |
| Paul Mbongo | Cameroon | Boxing | 1996 Summer | |
| Francky Mbotto | Central African Republic | Athletics | 2016 Summer, 2020 Summer | |
| Marc Mboua | Cameroon | Football | 2008 Summer | |
| Judith Mbougnade | Central African Republic | Boxing | 2016 Summer | |
| Paul Gnamia M'Boule | Ivory Coast | Canoe sprint | 1968 Summer, 1972 Summer | |
| Julio Mboumba | Gabon | Boxing | 1996 Summer | |
| Joseph M'Bouroukounda | 1972 Summer | |
| Antony Mboya [ Wikidata ] | Kenya | Rugby sevens | 2024 Summer | |
| Samuel Mbugua | Boxing | 1968 Summer, 1972 Summer | |
| Nathanaël Mbuku | France | Football | 2020 Summer | |
| John M'Bumba | Boxing | 2008 Summer | |
| Jennifer Mbuta | Kenya | Archery | 1996 Summer | |
| Mukendi Mbuyi | Democratic Republic of the Congo | Basketball | 1996 Summer | |
| Ian McAdam | Australia | Swimming | 1988 Summer | |
| Joshua McAdams | United States | Athletics | 2008 Summer | |
| John McAdorey | Ireland | 2000 Summer | |
| Max McAlary | Australia | Wrestling | 1964 Summer | |
| Arthur McAleenan | United States | Diving | 1912 Summer | |
| Shea McAleese | New Zealand | Field hockey | 2008 Summer, 2012 Summer, 2016 Summer, 2020 Summer | |
| Kevin McAlinden | Great Britain | Football | 1948 Summer | |
| Barbara McAlister | United States | Diving | 1964 Summer, 1968 Summer | |
| Kayla McAlister | New Zealand | Rugby sevens | 2016 Summer | |
| Bob McAllister | United States | Athletics | 1928 Summer | |
| Jean McAllister | Canada | Cross country skiing | 1988 Winter | |
| Jim McAndrew | Athletics | 1976 Summer | |
| Tracie McAra | Basketball | 1984 Summer | |
| Matthew McArdle | Australia | Rowing | 1992 Summer | |
| Pete McArdle | United States | Athletics | 1964 Summer | |
| Catherine McArthur | Australia | Canoe sprint | 2020 Summer | |
| Hamish McArthur | Great Britain | Sport climbing | 2024 Summer | |
| Ken McArthur | South Africa | Athletics | 1912 Summer | |
| Malcolm McArthur | Australasia | Rugby | 1908 Summer | |
| Thad McArthur | United States | Modern pentathlon | 1952 Summer | |
| Winston McArthur | Guyana | Weightlifting | 1956 Summer | |
| Cheryl McArton | Canada | Swimming | 1984 Summer | |
| Terry McAskell | Australia | Field hockey | 1972 Summer | |
| Bill McAtee | Water polo | 1964 Summer | |
| Barbara McAulay | Diving | 1956 Summer | |
| Grant McAuley | New Zealand | Rowing | 1976 Summer | |
| Sarah McAuley | Ireland | Field hockey | 2020 Summer | |
| Robert McAuliffe | Virgin Islands | Shooting | 1972 Summer | |
| Douglas McBain | Great Britain | Football | 1948 Summer | |
| Jack McBain | Canada | Ice hockey | 2022 Winter | |
| Marnie McBean | Rowing | 1992 Summer, 1996 Summer | |
| Darin McBeath | Alpine skiing | 2002 Winter | |
| Michael McBeath | Zimbabwe | Road cycling | 1980 Summer | |
| Tom McBreen | United States | Swimming | 1972 Summer | |
| Brandon McBride | Canada | Athletics | 2016 Summer, 2020 Summer | |
| Brian McBride | United States | Football | 2008 Summer | |
| Kevin McBride | Ireland | Boxing | 1992 Summer | |
| Violet McBride | Great Britain | Field hockey | 1988 Summer | |
| John McBryde | Australia | 1960 Summer, 1964 Summer | |
| Andrew McCabe | Athletics | 2012 Summer | |
| Arthur McCabe | Australasia | Rugby | 1908 Summer | |
| Bill McCabe | Australia | Water polo | 1956 Summer | |
| Bryan McCabe | Canada | Ice hockey | 2006 Winter | |
| Ceili McCabe | Athletics | 2024 Summer | |
| Conlin McCabe | Rowing | 2012 Summer, 2016 Summer, 2020 Summer | |
| Frank McCabe | United States | Basketball | 1952 Summer | |
| Jill McCabe | Sweden | Athletics | 1984 Summer | |
| Laura McCabe | United States | Cross country skiing | 1994 Winter, 1998 Winter | |
| Martha McCabe | Canada | Swimming | 2012 Summer, 2016 Summer | |
| Novie McCabe | United States | Cross country skiing | 2022 Winter | |
| Bill McCadney | Puerto Rico | Basketball | 1964 Summer, 1968 Summer | |
| Ian McCafferty | Great Britain | Athletics | 1972 Summer | |
| Lynn McCafferty | Handball | 2012 Summer | |
| Sean McCafferty | Ireland | Boxing | 1964 Summer | |
| Anne Marie McCaffrey | Canada | Swimming | 1972 Summer | |
| Bert McCaffrey | Ice hockey | 1924 Winter | |
| Janice McCaffrey | Athletics | 1992 Summer, 1996 Summer, 2000 Summer | |
| Pete McCaffrey | United States | Basketball | 1964 Summer | |
| Elizabeth McCagg | Rowing | 1992 Summer, 1996 Summer, 2000 Summer | |
| Mary McCagg | 1992 Summer, 1996 Summer | |
| Mike McCahey | Fencing | 1984 Summer | |
| Stephen McCain | Artistic gymnastics | 2000 Summer | |
| Graeme McCall | Australia | Rowing | 1964 Summer | |
| Robert McCall | Canada | Figure skating | 1984 Winter, 1988 Winter | |
| Robin McCall | South Africa | Rowing | 1992 Summer | |
| Dave McCalla | Great Britain | Bobsleigh | 2002 Winter | |
| Eric McCalla | Athletics | 1984 Summer | |
| Shona McCallin | Field hockey | 2016 Summer, 2020 Summer | |
| Charles McCallister | United States | Water polo | 1932 Summer, 1936 Summer | |
| Grace McCallum | Artistic gymnastics | 2020 Summer | |
| Mike McCallum | Jamaica | Boxing | 1976 Summer | |
| Sally McCallum | Canada | Athletics | 1960 Summer | |
| Maria McCambridge | Ireland | 2004 Summer | |
| Katy McCandless | 1996 Summer | |
| Pablo McCandless | Chile | Canoe slalom | 2008 Summer | |
| Morelle McCane | United States | Boxing | 2024 Summer | |
| Cormac McCann | Ireland | Road cycling | 1988 Summer | |
| David McCann | 1996 Summer, 2000 Summer, 2012 Summer | |
| Fiona McCann | Great Britain | Water polo | 2012 Summer | |
| Jodie McCann | Ireland | Athletics | 2024 Summer | |
| John Paul McCann | Great Britain | Polo | 1908 Summer | |
| Joseph McCann | Australia | Diving | 1956 Summer | |
| Kerryn McCann | Athletics | 1996 Summer, 2000 Summer, 2004 Summer | |
| Kirsten McCann | South Africa | Rowing | 2008 Summer, 2016 Summer | |
| Luke McCann | Ireland | Athletics | 2024 Summer | |
| Melanie McCann | Canada | Modern pentathlon | 2012 Summer, 2016 Summer | |
| Michael McCann | Australia | Field hockey | 2004 Summer | |
| Ross McCann | Great Britain | Rugby sevens | 2020 Summer | |
| Stephanie McCann | Canada | Athletics | 2004 Summer | |
| Terrence McCann | United States | Wrestling | 1960 Summer | |
| Donna McCannell | Canada | Speed skating | 1972 Winter | |
| Doreen McCannell-Botterill | 1964 Winter, 1968 Winter | |
| Keaton McCargo | United States | Freestyle skiing | 2018 Winter | |
| Wayne McCarney | Australia | Track cycling | 1988 Summer | |
| Edward McCartan | United States | Art competitions | 1932 Summer | |
| Jack McCartan | Ice hockey | 1960 Winter | |
| Steffin McCarter | Athletics | 2020 Summer | |
| Benni McCarthy | South Africa | Football | 2000 Summer | |
| Brendan McCarthy | Ireland | Boxing | 1968 Summer | |
| Chris McCarthy | United States | Athletics | 1964 Summer | |
| Earl McCarthy | Ireland | Swimming | 1996 Summer | |
| Fabian McCarthy | South Africa | Football | 2000 Summer | |
| Fintan McCarthy | Ireland | Rowing | 2020 Summer, 2024 Summer | |
| Frederick McCarthy | Canada | Track cycling | 1908 Summer | |
| Fynn McCarthy | Volleyball | 2024 Summer | |
| Jack McCarthy | Ireland | Football | 1924 Summer | |
| Jeremiah McCarthy | Great Britain | Rowing | 1972 Summer | |
| John McCarthy | United States | Ice hockey | 2018 Winter | |
| Justin McCarthy | 1924 Winter | |
| Kris McCarthy | Australia | Athletics | 2000 Summer | |
| Marion McCarthy | Canada | Speed skating | 1932 Winter | |
| Martina McCarthy | Ireland | Athletics | 2000 Summer | |
| Michael McCarthy | United States | Track cycling | 1988 Summer, 1996 Summer | |
| Padraig McCarthy | Ireland | Equestrian eventing | 2016 Summer | |
| Pål McCarthy | Norway | Sailing | 1992 Summer | |
| Peggy McCarthy | United States | Rowing | 1976 Summer | |
| Eliza McCartney | New Zealand | Athletics | 2016 Summer, 2024 Summer | |
| Jason McCartney | United States | Road cycling | 2004 Summer, 2008 Summer | |
| Chad McCarty | Football | 2000 Summer | |
| Dax McCarty | 2008 Summer | |
| Arthur McCashin | Equestrian jumping | 1952 Summer | |
| Sonja McCaskie | Great Britain | Alpine skiing | 1960 Winter | |
| George McCauley | Canada | Rowing | 1952 Summer | |
| Jenny McCauley | Ireland | Cycling mountain bike | 2004 Summer | |
| Chip McCaw | United States | Volleyball | 2000 Summer | |
| Shirley McCay | Ireland | Field hockey | 2020 Summer | |
| Katrina McClain | United States | Basketball | 1988 Summer, 1992 Summer, 1996 Summer | |
| Thaddeus McClain | Athletics | 1900 Summer | |
| Valerie McClain-Ward | Rowing | 1984 Summer | |
| Rob McClanahan | Ice hockey | 1980 Winter | |
| Alan McClatchey | Great Britain | Swimming | 1976 Summer | |
| Caitlin McClatchey | 2004 Summer, 2008 Summer, 2012 Summer | |
| Derek McCleane | Ireland | Athletics | 1964 Summer | |
| Winslow McCleary [ Wikidata ] | Canada | Rowing | 1912 Summer | |
| Dave McCleave | Great Britain | Boxing | 1932 Summer | |
| Alan McCleery | Canada | Canoe sprint | 1960 Summer | |
| Dorothy McClements | United States | Artistic gymnastics | 1964 Summer | |
| Lyn McClements | Australia | Swimming | 1968 Summer | |
| Rhys McClenaghan | Ireland | Artistic gymnastics | 2020 Summer, 2024 Summer | |
| Trent McClenahan | Australia | Football | 2008 Summer | |
| Haylie McCleney | United States | Softball | 2020 Summer | |
| Karen McCloskey | Rowing | 1976 Summer | |
| Paul McCloy | Canada | Athletics | 1988 Summer | |
| Allen McClure | United States | Sailing | 1960 Summer | |
| Brett McClure | Artistic gymnastics | 2004 Summer | |
| Patrick McClure | Ireland | Water polo | 1928 Summer | |
| Richard McClure | Canada | Rowing | 1956 Summer | |
| Walter McClure | United States | Athletics | 1912 Summer | |
| Wilbert McClure | Boxing | 1960 Summer | |
| William McClure [ Wikidata ] | Great Britain | Shooting | 1912 Summer | |
| Joe McCluskey | United States | Athletics | 1932 Summer, 1936 Summer | |
| John McCluskey | Great Britain | Boxing | 1964 Summer | |
| Eilish McColgan | Athletics | 2012 Summer, 2016 Summer, 2020 Summer, 2024 Summer | |
| Liz McColgan | 1988 Summer, 1992 Summer, 1996 Summer | |
| Emily McColl | New Zealand | Football | 2008 Summer | |
| Jimmy McColl | Great Britain | 1948 Summer | |
| Sean McColl | Canada | Sport climbing | 2020 Summer | |
| Dennis McComak | United States | Archery | 1972 Summer | |
| David McComb | Canada | Luge | 1972 Winter, 1976 Winter | |
| Ian McCombie | Great Britain | Athletics | 1984 Summer, 1988 Summer | |
| Stephen McConaghy | Australia | Sailing | 1996 Summer | |
| Mary McConkey | Canada | Swimming | 1936 Summer | |
| Bill McConnell | Rowing | 1948 Summer | |
| Billy McConnell | Great Britain | Field hockey | 1984 Summer | |
| Chad McConnell | United States | Baseball | 1992 Summer | |
| Daniel McConnell | Australia | Cycling mountain bike | 2008 Summer, 2012 Summer, 2016 Summer, 2020 Summer | |
| Frank McConnell | Canada | Athletics | 1912 Summer | |
| Lee McConnell | Great Britain | 2004 Summer, 2008 Summer, 2012 Summer | |
| Suzie McConnell-Serio | United States | Basketball | 1988 Summer, 1992 Summer | |
| Mary McConneloug | Cycling mountain bike | 2004 Summer, 2008 Summer | |
| John McConnochie | New Zealand | Swimming | 1972 Summer, 1976 Summer | |
| Ruaridh McConnochie | Great Britain | Rugby sevens | 2016 Summer | |
| Steve McCooke | Athletics | 1948 Summer | |
| Courtney McCool | United States | Artistic gymnastics | 2004 Summer | |
| Jason McCoombs | Canada | Canoe sprint | 2012 Summer | |
| Jenna McCorkell | Great Britain | Figure skating | 2010 Winter, 2014 Winter | |
| Don McCorkindale | South Africa | Boxing | 1928 Summer | |
| Alan McCormack | Ireland | Road cycling | 1976 Summer | |
| Alicia McCormack | Australia | Water polo | 2008 Summer, 2012 Summer | |
| Darryl McCormack [ Wikidata ] | Handball | 2000 Summer | |
| Fionnuala McCormack | Ireland | Athletics | 2008 Summer, 2012 Summer, 2016 Summer, 2020 Summer, 2024 Summer | |
| Jessica McCormack | New Zealand | Basketball | 2008 Summer | |
| John McCormack | United States | Diving | 1952 Summer | |
| John McCormack | Great Britain | Boxing | 1956 Summer | |
| Kathy McCormack | Canada | Ice hockey | 1998 Winter | |
| Luke McCormack | Great Britain | Boxing | 2020 Summer | |
| Pat McCormack | 2016 Summer, 2020 Summer | |
| Paul McCormack | Ireland | Road cycling | 1988 Summer | |
| Simon McCormack | Australia | Diving | 1992 Summer | |
| Daniel McCormick | United States | Judo | 2008 Summer | |
| Debbie McCormick | Curling | 1998 Winter, 2002 Winter, 2010 Winter, 2014 Winter | |
| Joseph McCormick | Ice hockey | 1920 Summer | |
| Kelly McCormick | Diving | 1984 Summer, 1988 Summer | |
| Lawrence McCormick | Ice hockey | 1920 Summer | |
| Martin McCormick | Canoe slalom | 1992 Summer | |
| Nick McCormick | Great Britain | Athletics | 2012 Summer | |
| Pat McCormick | United States | Diving | 1952 Summer, 1956 Summer | |
| Riley McCormick | Canada | 2008 Summer, 2012 Summer | |
| Francena McCorory | United States | Athletics | 2012 Summer, 2016 Summer | |
| Alastair McCorquodale | Great Britain | 1948 Summer | |
| Eric McCosh | Hong Kong | Field hockey | 1964 Summer | |
| John McCosker | United States | Rowing | 1932 Summer | |
| Angel McCoughtry | Basketball | 2012 Summer, 2016 Summer | |
| Jim McCourt | Ireland | Boxing | 1964 Summer, 1968 Summer | |
| John McCourtney | Great Britain | Wrestling | 1968 Summer | |
| Brian McCowage | Australia | Fencing | 1956 Summer, 1960 Summer, 1964 Summer | |
| Callum McCowatt | New Zealand | Football | 2020 Summer | |
| Bill McCowen | Great Britain | Bobsleigh | 1964 Winter | |
| Donald McCowen | Rowing | 1932 Summer | |
| Charlie McCoy | Track cycling | 1960 Summer | |
| Colm McCoy | Ireland | Boxing | 1960 Summer | |
| Dennis McCoy | United States | Alpine skiing | 1968 Winter | |
| Jake McCoy | Ice hockey | 1964 Winter | |
| Kerry McCoy | Wrestling | 2000 Summer, 2004 Summer | |
| Rachel McCoy | Athletics | 2020 Summer | |
| Walter McCoy | 1984 Summer | |
| Wanya McCoy | Bahamas | 2024 Summer | |
| Josiah McCracken | United States | 1900 Summer | |
| Nikki McCray-Penson | Basketball | 1996 Summer, 2000 Summer | |
| D'Arcy McCrea | Ireland | Tennis | 1924 Summer | |
| J. Nash McCrea | United States | Track cycling | 1904 Summer | |
| Earl McCready | Canada | Wrestling | 1928 Summer | |
| Michael McCready | Great Britain | Fencing | 1948 Summer | |
| Sue McCready | Australia | Shooting | 2000 Summer, 2004 Summer, 2008 Summer | |
| Sade McCreath | Canada | Athletics | 2024 Summer | |
| Malcolm McCredie | Australia | Road cycling | 1964 Summer | |
| Nancy McCredie | Canada | Athletics | 1964 Summer | |
| Walter McCreery | Great Britain | Polo | 1900 Summer | |
| Nick McCrory | United States | Diving | 2012 Summer | |
| Steve McCrory | Boxing | 1984 Summer | |
| Bradley McCuaig | Canada | Athletics | 2000 Summer | |
| James McCubbin | Uruguay | Rugby sevens | 2024 Summer | |
| Chris McCubbins | Canada | Athletics | 1976 Summer | |
| Patrick McCue | Australasia | Rugby | 1908 Summer | |
| Conor McCullough | Ireland | Athletics | 1984 Summer, 1988 Summer | |
| Maxie McCullagh | Boxing | 1948 Summer | |
| Alexander McCulloch | Great Britain | Rowing | 1908 Summer | |
| Kaarle McCulloch | Australia | Track cycling | 2012 Summer, 2020 Summer | |
| Conor McCullough | United States | Athletics | 2016 Summer | |
| Dylan McCullough | New Zealand | Triathlon | 2024 Summer | |
| Ernie McCullough | Canada | Athletics | 1948 Summer | |
| Jack McCullough | Road cycling | 1972 Summer | |
| Wayne McCullough | Ireland | Boxing | 1988 Summer, 1992 Summer | |
| Wallace McCurdy [ Wikidata ] | United States | Athletics | 1912 Summer | |
| Shannon McCurley | Ireland | Track cycling | 2016 Summer, 2020 Summer | |
| Eamonn McCusker | Boxing | 1968 Summer | |
| Joan McCusker | Canada | Curling | 1998 Winter | |
| Max McCusker [ Wikidata ] | Ireland | Swimming | 2024 Summer | |
| Anahira McCutcheon [ Wikidata ] | Fiji | 2024 Summer | |
| Pat McCutcheon | Australia | Rugby sevens | 2016 Summer | |
| Thornton McDade | South Africa | Field hockey | 2008 Summer, 2012 Summer | |
| Danny McDaid | Ireland | Athletics | 1972 Summer, 1976 Summer | |
| Mildred McDaniel | United States | 1956 Summer | |
| Heather McDermid | Canada | Rowing | 1996 Summer, 2000 Summer | |
| Sally McDermid | Australia | Softball | 1996 Summer, 2000 Summer | |
| Christopher McDermott | Great Britain | Handball | 2012 Summer | |
| Don McDermott | United States | Speed skating | 1952 Winter, 1956 Winter | |
| Gregory McDermott | Australia | Equestrian jumping | 1988 Summer | |
| Lee McDermott | Great Britain | Artistic gymnastics | 1996 Summer | |
| Mike McDermott | United States | Swimming, Water polo | 1912 Summer, 1920 Summer | |
| Peter McDermott | Australia | Road cycling | 1968 Summer | |
| Terry McDermott | United States | Speed skating | 1960 Winter, 1964 Winter, 1968 Winter | |
| Archie McDiarmid | Canada | Athletics | 1920 Summer | |
| Myles McDonagh | Ireland | Boxing | 1924 Summer, 1928 Summer | |
| Pat McDonagh | Rowing, Bobsleigh | 1980 Summer, 1988 Summer, 1992 Winter | |
| Ryan McDonagh | United States | Ice hockey | 2014 Winter | |
| Andrew McDonald | Water polo | 1984 Summer | |
| Arthur McDonald | Great Britain | Sailing | 1948 Summer | |
| Barry McDonald | Ireland | Artistic gymnastics | 1996 Summer | |
| Beverly McDonald | Jamaica | Athletics | 1996 Summer, 2000 Summer, 2004 Summer | |
| Charlie McDonald | United States | Bobsleigh | 1964 Winter | |
| Christina McDonald | Canada | Artistic gymnastics | 1988 Summer | |
| Cole McDonald | United States | Freestyle skiing | 2022 Winter | |
| Damian McDonald | Australia | Road cycling | 1996 Summer | |
| Debbie McDonald | United States | Equestrian dressage | 2004 Summer, 2008 Summer | |
| Douglas McDonald | Canada | Rowing | 1956 Summer | |
| Felix McDonald | Guatemala | Football | 1976 Summer | |
| Gordon McDonald | Canada | 1904 Summer | |
| Grant McDonald | Australia | Baseball | 1996 Summer, 2000 Summer | |
| Herbert McDonald | Canada | Road cycling, Track cycling | 1920 Summer | |
| Jenny McDonald | New Zealand | Field hockey | 1984 Summer | |
| Jimmy McDonald | Ireland | Athletics | 1988 Summer, 1992 Summer, 1996 Summer | |
| John McDonald | Canada | Archery | 1988 Summer | |
| Julie McDonald | Australia | Swimming | 1968 Summer | |
| Julie McDonald | 1988 Summer, 1992 Summer | |
| Justin McDonald | Bobsleigh | 1994 Winter | |
| Kate McDonald | Artistic gymnastics | 2024 Summer | |
| Ken McDonald | Weightlifting | 1952 Summer | |
| Michael McDonald | Jamaica | Athletics | 1996 Summer, 2000 Summer | |
| Morgan McDonald | Australia | 2020 Summer, 2024 Summer | |
| Natassha McDonald | Canada | 2020 Summer | |
| Neal McDonald | Great Britain | Sailing | 1988 Summer | |
| Pat McDonald | United States | Athletics | 1912 Summer, 1920 Summer | |
| Peter McDonald | Ireland | Football | 1948 Summer | |
| Rich McDonald | Canada | Athletics | 1972 Summer | |
| Rusheen McDonald | Jamaica | 2012 Summer, 2016 Summer | |
| Sally-Anne McDonald [ Wikidata ] | Zimbabwe | Tennis | 1992 Summer | |
| Tyla Mcdonald [ Wikidata ] | Australia | Boxing | 2024 Summer | |
| Nick McDonald-Crowley | Rowing | 1992 Summer | |
| Barry McDonnell | Ireland | 1948 Summer | |
| Donald McDonnell | Australia | Boxing | 1952 Summer | |
| Nancy McDonnell | Canada | Artistic gymnastics | 1972 Summer, 1976 Summer | |
| Teresa McDonnell | 1968 Summer, 1972 Summer, 1976 Summer | |
| William McDonnell | United States | Shooting | 1912 Summer | |
| Andy McDonough | Ireland | Rowing | 1976 Summer | |
| Brian McDonough | United States | Track cycling | 1996 Summer | |
| Patrick McDonough | 1984 Summer | |
| Brooklyn McDougall | Canada | Speed skating | 2022 Winter | |
| Christine McDougall | Australia | Fencing | 1972 Summer | |
| Duncan McDougall | Great Britain | Rowing | 1980 Summer, 1984 Summer | |
| Grant McDougall | United States | Athletics | 1932 Summer | |
| Purvis McDougall | Canada | Bobsleigh | 1968 Winter | |
| Curtis McDowald | United States | Fencing | 2020 Summer | |
| John McDowall | Great Britain | Swimming | 1924 Summer | |
| Margaret McDowall | 1952 Summer | |
| Blaire McDowell [ Wikidata ] | Canada | Water polo | 2024 Summer | |
| Jean McDowell | Great Britain | Swimming | 1928 Summer | |
| Katie McDowell | United States | Sailing | 2004 Summer | |
| Kevin McDowell | Triathlon | 2020 Summer | |
| Marty McDowell | New Zealand | Canoe sprint | 2016 Summer | |
| Paul McDowell | United States | Rowing | 1928 Summer | |
| Antonio McDyess | Basketball | 2000 Summer | |
| James McEachern | Athletics | 1920 Summer, 1924 Summer | |
| John McEachern [ Wikidata ] | Canada | 1920 Summer | |
| Norman McEachern | Ireland | 1924 Summer, 1928 Summer | |
| Shawn McEachern | United States | Ice hockey | 1992 Winter | |
| Evan McEachran | Canada | Freestyle skiing | 2018 Winter, 2022 Winter | |
| Linda McEachrane | Trinidad and Tobago | Swimming | 2004 Summer | |
| Marcus McElhenney | United States | Rowing | 2008 Summer | |
| Morgan McElligott | Ireland | 1948 Summer | |
| Jim McElmury | United States | Ice hockey | 1972 Winter | |
| Philip McElwaine | Australia | Boxing | 1976 Summer | |
| Sam McEntee | Athletics | 2016 Summer | |
| Cameron McEntyre | 2024 Summer | |
| Cameron McEvoy | Swimming | 2012 Summer, 2016 Summer, 2020 Summer, 2024 Summer | |
| Frederick McEvoy | Great Britain | Bobsleigh | 1936 Winter | |
| Alex McEwan | Australia | Short track speed skating | 2002 Winter, 2006 Winter | |
| Devin McEwan | United States | Canoe slalom | 2016 Summer | |
| Jamie McEwan | 1972 Summer, 1992 Summer | |
| Dawn McEwen | Canada | Curling | 2014 Winter, 2022 Winter | |
| Robbie McEwen | Australia | Road cycling | 1996 Summer, 2000 Summer, 2004 Summer | |
| Shelby McEwen | United States | Athletics | 2020 Summer, 2024 Summer | |
| Tom McEwen | Great Britain | Equestrian eventing | 2020 Summer, 2024 Summer | |
| Greg McFadden | Australia | Water polo | 1992 Summer | |
| Michael McFadden | Zimbabwe | Sailing | 1964 Summer | |
| Miki McFadden | United States | Volleyball | 1968 Summer | |
| Cameron McFadzean | Australia | Canoe sprint | 1996 Summer, 2000 Summer | |
| Lauren McFall | United States | Artistic swimming | 2004 Summer | |
| Jennifer McFalls | Softball | 2000 Summer | |
| Max McFarland | Great Britain | Rugby sevens | 2020 Summer | |
| Bob McFarlane | Canada | Athletics | 1948 Summer | |
| Danny McFarlane | Jamaica | 2000 Summer, 2004 Summer, 2008 Summer | |
| Don McFarlane | Canada | 1948 Summer | |
| Don McFarlane | 1952 Summer | |
| Mike McFarlane | Great Britain | 1980 Summer, 1984 Summer, 1988 Summer | |
| Tracey McFarlane | United States | Swimming | 1988 Summer | |
| David McFaull | Sailing | 1976 Summer | |
| Ayeisha McFerran | Ireland | Field hockey | 2020 Summer | |
| Kathleen McGahey | United States | 1984 Summer | |
| Desmond McGann | Ireland | Athletics | 1972 Summer | |
| Kirsten McGarry | Alpine skiing | 2006 Winter, 2010 Winter | |
| Tamsen McGarry | 2002 Winter | |
| Ngarohi McGarvey-Black | New Zealand | Rugby sevens | 2020 Summer, 2024 Summer | |
| Ethel McGary | United States | Swimming | 1928 Summer | |
| Kara McGaw | Canada | Softball | 1996 Summer | |
| Robert McGaw | Great Britain | Artistic gymnastics | 1908 Summer | |
| Richard McGeagh | United States | Swimming | 1964 Summer | |
| Bradley McGee | Australia | Track cycling | 1996 Summer, 2000 Summer, 2004 Summer, 2008 Summer | |
| Cory McGee | United States | Athletics | 2020 Summer | |
| JaVale McGee | Basketball | 2020 Summer | |
| Jimmy McGee | Ireland | 1948 Summer | |
| Pamela McGee | United States | 1984 Summer | |
| Portia McGee | Rowing | 2008 Summer | |
| Pat McGeer | Canada | Basketball | 1948 Summer | |
| Finn McGeever | Ireland | Swimming | 2020 Summer | |
| Adam McGeorge | New Zealand | Football | 2012 Summer | |
| Sonia McGeorge | Great Britain | Athletics | 1996 Summer | |
| Roisin McGettigan | Ireland | 2008 Summer | |
| Carla McGhee | United States | Basketball | 1996 Summer | |
| Natalie McGiffert | Rhythmic gymnastics | 2016 Summer | |
| David McGill | Canada | Athletics | 1924 Summer | |
| Knowles McGill | Biathlon | 1968 Winter | |
| Linda McGill | Australia | Swimming | 1964 Summer | |
| Tyler McGill | United States | 2012 Summer | |
| David McGillivray | Canada | Figure skating | 1968 Winter | |
| Matthew McGillivray | South Africa | Surfing | 2024 Summer | |
| Perry McGillivray | United States | Swimming, Water polo | 1912 Summer, 1920 Summer | |
| Ciara McGing | Ireland | Diving | 2024 Summer | |
| Sonya McGinn | Badminton | 2000 Summer | |
| Charles McGinnis | United States | Athletics | 1928 Summer | |
| Donna McGinnis | Canada | Swimming | 1984 Summer, 1988 Summer | |
| Mark McGivern | Great Britain | Volleyball | 2012 Summer | |
| Nicola McGivern | Equestrian dressage | 2004 Summer | |
| Hamish McGlashan | Australia | Rowing | 1988 Summer, 1992 Summer | |
| Stephen McGlede | Track cycling | 1988 Summer, 1992 Summer | |
| Michael McGlinchey | New Zealand | Football | 2012 Summer | |
| Samantha McGlone | Canada | Triathlon | 2004 Summer | |
| Dick McGlynn | United States | Ice hockey | 1972 Winter | |
| Edward McGlynn | Australia | Athletics | 1956 Summer | |
| Jack McGlynn | United States | Football | 2024 Summer | |
| Michael McGlynn | South Africa | Marathon swimming | 2020 Summer | |
| Leilani McGonagle | Costa Rica | Surfing | 2020 Summer | |
| Johnny McGonigle | Great Britain | Boxing | 1968 Summer | |
| John McGough | Athletics | 1908 Summer | |
| Scott McGough | United States | Baseball | 2020 Summer | |
| Matt McGovern | Ireland | Sailing | 2012 Summer, 2016 Summer | |
| David McGowan [ Wikidata ] | United States | Archery | 1904 Summer | |
| David McGowan | Australia | Rowing | 2004 Summer | |
| Ian McGowan | United States | 2000 Summer | |
| Malcolm McGowan | Great Britain | 1980 Summer, 1984 Summer | |
| Rebecca McGowan | Taekwondo | 2024 Summer | |
| Rhoderick McGown | Zimbabwe | Swimming | 1992 Summer | |
| Peter McGrail | Great Britain | Boxing | 2020 Summer | |
| Dennis McGrane | United States | Ski jumping | 1984 Winter, 1988 Winter | |
| John McGrane | Canada | Football | 1976 Summer | |
| Paul McGrath | Spain | Athletics | 2024 Summer | |
| Atle Lie McGrath | Norway | Alpine skiing | 2022 Winter | |
| Danielle McGrath | Australia | Figure skating | 1992 Winter, 1994 Winter, 1998 Winter | |
| Felix McGrath | United States | Alpine skiing | 1988 Winter | |
| Kevin McGrath | Australia | Wrestling | 1964 Summer | |
| Matt McGrath | United States | Athletics, Tug of war | 1908 Summer, 1912 Summer, 1920 Summer, 1924 Summer | |
| Mick McGrath | Australia | Athletics | 1972 Summer | |
| Paddy McGrath [ Wikidata ] | Ireland | 2000 Summer | |
| Seamus McGrath | Canada | Cycling mountain bike | 2004 Summer, 2008 Summer | |
| Virginia McGrath | Ireland | Equestrian eventing | 1996 Summer, 2000 Summer | |
| Riley McGree | Australia | Football | 2020 Summer | |
| Alistair McGregor | Great Britain | Field hockey | 2008 Summer | |
| Bob McGregor | Swimming | 1964 Summer, 1968 Summer | |
| Courtney McGregor | New Zealand | Artistic gymnastics | 2016 Summer | |
| David McGregor | Great Britain | Water polo | 1936 Summer | |
| Guy McGregor | New Zealand | Field hockey | 1956 Summer, 1960 Summer | |
| Haley McGregor | Australia | Athletics | 2004 Summer | |
| Herbert McGregor | Jamaica | 2008 Summer | |
| Robert McGregor | Australia | Modern pentathlon | 2000 Summer | |
| Roneisha McGregor | Jamaica | Athletics | 2020 Summer | |
| Sam McGregor | Australia | Water polo | 2004 Summer, 2008 Summer, 2012 Summer | |
| William McGregor | Canada | Judo | 1972 Summer | |
| Yvonne McGregor | Great Britain | Road cycling, Track cycling | 1996 Summer, 2000 Summer | |
| Susan McGreivy | United States | Swimming | 1956 Summer | |
| Vern McGrew | Athletics | 1948 Summer | |
| Brenda McGrory | Ireland | Swimming | 1972 Summer | |
| Kelly McGrory | Athletics | 2024 Summer | |
| Scott McGrory | Australia | Track cycling, Road cycling | 1988 Summer, 2000 Summer | |
| Sam McGuffie | United States | Bobsleigh | 2018 Winter | |
| Walter McGuffie | Great Britain | Wrestling | 1948 Summer | |
| Barry McGuigan | Ireland | Boxing | 1980 Summer | |
| Larry McGuinness | Canada | Equestrian eventing | 1952 Summer | |
| Dennis McGuire | Australia | Canoe sprint | 1964 Summer | |
| Duncan McGuire | United States | Football | 2024 Summer | |
| Edith McGuire | Athletics | 1964 Summer | |
| Josh McGuire | Canada | Fencing | 2004 Summer, 2008 Summer | |
| Phil McGuire | Great Britain | Field hockey | 1996 Summer | |
| Tom McGuirk | Ireland | Athletics | 1996 Summer, 2000 Summer | |
| Frank McGurk | Great Britain | Boxing | 1908 Summer | |
| Kobie McGurk | Australia | Field hockey | 2008 Summer, 2012 Summer | |
| Christina McHale | United States | Tennis | 2012 Summer | |
| Judith McHale | Canada | Swimming | 1960 Summer | |
| Isaac McHardie | New Zealand | Sailing | 2024 Summer | |
| Guram Mchedlidze | Georgia | Wrestling | 2000 Summer | |
| Murazi Mchedlidze | Ukraine | 2024 Summer | |
| Chris McHugh | Australia | Beach volleyball | 2020 Summer | |
| Ed McHugh | United States | Football | 1952 Summer | |
| Jayne McHugh | Volleyball | 1988 Summer | |
| Jennifer McHugh | Canada | Swimming | 1972 Summer | |
| Terry McHugh | Ireland | Athletics, Bobsleigh | 1988 Summer, 1992 Summer, 1992 Winter, 1996 Summer, 1998 Winter, 2000 Summer | |
| Gord McIlquham | Canada | Sailing | 1988 Summer | |
| Lincoln McIlravy | United States | Wrestling | 2000 Summer | |
| Charles McIlroy | Water polo | 1960 Summer, 1964 Summer | |
| James McIlroy | Great Britain | Athletics | 2000 Summer | |
| Kate McIlroy | New Zealand | Triathlon | 2012 Summer | |
| Ned McIlroy | United States | Water polo | 1964 Summer | |
| Rory McIlroy | Ireland | Golf | 2020 Summer, 2024 Summer | |
| Charles McIlvaine | United States | Rowing | 1928 Summer | |
| Harry McIlvenny | Great Britain | Football | 1948 Summer | |
| Wayne McIndoe | New Zealand | Field hockey | 2004 Summer | |
| Dugald McInnes | Canada | Shooting | 1908 Summer | |
| John McInnes | Ski jumping | 1964 Winter, 1968 Winter | |
| Marty McInnis | United States | Ice hockey | 1992 Winter | |
| Aaron McIntosh | New Zealand | Sailing | 1996 Summer, 2000 Summer | |
| Avis McIntosh | Athletics | 1964 Summer | |
| Cameron McIntosh | South Africa | Canoe slalom | 2008 Summer | |
| Cecilia McIntosh | Australia | Bobsleigh | 2010 Winter | |
| Colin McIntosh | New Zealand | Equestrian jumping | 1988 Summer | |
| Fiona McIntosh | Great Britain | Fencing | 1984 Summer, 1988 Summer, 1992 Summer, 1996 Summer | |
| Hayley McIntosh | New Zealand | Swimming | 2020 Summer | |
| James McIntosh | United States | Rowing | 1956 Summer | |
| Jennifer McIntosh | Great Britain | Shooting | 2012 Summer, 2016 Summer | |
| Karen McIntosh | United States | Equestrian dressage | 1964 Summer | |
| Raasin McIntosh | Liberia | Athletics | 2012 Summer | |
| Ricky McIntosh | Jamaica | Bobsleigh | 1992 Winter | |
| Samantha McIntosh | Bulgaria | Equestrian jumping | 2000 Summer | |
| Seonaid McIntosh | Great Britain | Shooting | 2020 Summer, 2024 Summer | |
| Stuart McIntosh | Canoe slalom | 2000 Summer, 2004 Summer | |
| Summer McIntosh | Canada | Swimming | 2020 Summer, 2024 Summer | |
| Troy McIntosh | Bahamas | Athletics | 1996 Summer, 2000 Summer | |
| Trudy McIntosh | Australia | Artistic gymnastics | 2000 Summer | |
| Alan McIntyre | New Zealand | Field hockey | 1968 Summer, 1976 Summer | |
| Annabelle McIntyre | Australia | Rowing | 2020 Summer, 2024 Summer | |
| Eilidh McIntyre | Great Britain | Sailing | 2020 Summer | |
| Elizabeth McIntyre | United States | Freestyle skiing | 1992 Winter, 1994 Winter, 1998 Winter | |
| Gerry McIntyre | Ireland | Athletics | 1960 Summer | |
| Graeme McIntyre | New Zealand | Shooting | 1972 Summer, 1976 Summer | |
| John McIntyre | United States | Rowing | 1948 Summer | |
| John McIntyre | Canada | 1968 Summer | |
| Michael McIntyre | Great Britain | Sailing | 1984 Summer, 1988 Summer | |
| Rob McIntyre | Australia | Alpine skiing | 1976 Winter, 1980 Winter | |
| Margaret McIver | Equestrian dressage | 1984 Summer | |
| Ashleigh McIvor | Canada | Freestyle skiing | 2010 Winter | |
| Megan McJames | United States | Alpine skiing | 2010 Winter, 2014 Winter, 2018 Winter | |