| M. Jaishankar | 2008 - 2011 | India | 19 |
| Ma Jiajue | 2004 | China | 4 |
| Macario Alcalá Canchola | 1960 - 1962 | Mexico | 2+ |
| Mack Ray Edwards | 1953 - 1970 | USA | 6+ |
| Madani Bouhouche | 1982 - 1989 | Belgium | 2+ |
| Maddison Hall | 1987 | Australia | 1 |
| Madeleine Hamilton Smith | 1857 | United Kingdom | 1 |
| Madeleine Mouton | 1943 - 1944 | Algeria | 4+ |
| Madumetsa Jack Mogale | 2008 - 2009 | South Africa | 16 |
| Magdalena Łuczak | 2011 - 2012 | Poland | 1 |
| Magdalena Solís | 1963 | Mexico | 2+ |
| Mahin Qadiri | 2006 | Iran | 6 |
| Mahmut Yıldırım | 1980 - 1998 | Turkey | 12+ |
| Maina Ramulu | 2003 - 2018 | India | 16+ |
| Majid Salek Mahmoudi | 1981 - 1985 | Iran | 24 |
| Maksa bin Tohaiee | 1990 | Singapore | 1 |
| Maksim Gelman | 2011 | USA | 4 |
| Malachi Martin | 1856 - 1862 | Australia | 2-5 |
| Malaika Tamu Griffin | 1999 | USA | 1 |
| Malcolm George Baker | 1992 | Australia | 6 |
| Malcolm Robbins | 1979 - 1980 | USA | 4+ |
| Malik Samartaney | 1991 - 2019 | USA | 3+ |
| Mamoru Takuma | 2001 | Japan | 8 |
| Manuel Blanco Romasanta | 1844 - 1852 | Spain | 9 |
| Manuel Delgado Villegas | 1964 - 1971 | Spain | 7 |
| Manuel Machado Alvarez | 1981 - 1987 | Cuba | 2 |
| Manuel Moore | 1972 - 1974 | USA | 15+ |
| Manuel Octavio Bermúdez Estrada | 1999 - 2003 | Colombia | 21+ |
| Manuel Pardo Jr. | 1986 | USA | 9 |
| Manuel Pina Babbitt | 1980 | USA | 1 |
| Maoupa Cedric Maake | 1996 - 1997 | South Africa | 27+ |
| Marc Paul Alain Dutroux | 1985 - 1996 | Belgium | 4+ |
| Marc Vincent Sappington | 2001 | USA | 4 |
| Marcel André Henri Félix Petiot | 1942 - 1944 | France | 27+ |
| Marcel Henri Barbeault | 1969 - 1976 | France | 8 |
| Marcel Wayne Williams | 1994 | USA | 1 |
| Marcelo Costa de Andrade | 1991 | Brazil | 14 |
| Marcin Kasprzak | 1885 - 1904 | Poland | 4 |
| Marco Allen Chapman | 2002 | USA | 2 |
| Marco Bergamo | 1985 - 1992 | Italy | 5 |
| Marco Furlan | 1977 - 1984 | Italy | 10+ |
| Marcus Delon Wesson | 2004 | USA | 9 |
| Margaret DeFrancisco | 2000 | USA | 1 |
| Margaret Higgins | 1880 - 1883 | United Kingdom | 1+ |
| Margaret Rudin | 1994 | USA | 1 |
| Margaret Waters | 1864 - 1870 | United Kingdom | 1+ |
| Margit Julianna Elek | 1958 - 1968 | Hungary | 6 |
| Marguerite Jeanne Steinheil | 1908 | France | 2 |
| Marguerite Marie Alibert | 1923 | France | 1 |
| Marguerite Pitre | 1949 | Canada | 19+ |
| Maria Barbella | 1895 | USA | 1 |
| Maria Catherina van der Linden-Swanenburg | 1880 - 1883 | Netherlands | 27 |
| María de Jesús González Valenzuela | 1950 - 1964 | Mexico | 91+ |
| María de las Mercedes Bernardina Bolla Aponte de Murano | 1979 | Argentina | 3 |
| María del Carmen González Valenzuela | 1950 - 1964 | Mexico | 91+ |
| María del Pilar Pérez López | 2008 | Chile | 3 |
| Maria del Rosio Alfaro | 1990 | USA | 1 |
| María Delfina González Valenzuela | 1950 - 1964 | Mexico | 91+ |
| Mária Gerzsány | 1905 - 1911 | Hungary | 50+ |
| Maria Gruber | 1983 - 1989 | Austria | 49+ |
| María Luisa González Valenzuela | 1950 - 1964 | Mexico | 91+ |
| Maria Matias Isa | 1989 | USA / Brazil | 1 |
| Maria Pearson | 1987 | United Kingdom | 1 |
| Maria Romberg | 1722 - 1724 | Sweden | 1 |
| Maria Velten | 1963 - 1982 | Germany | 5 |
| Mariam Soulakiotis | 1939 - 1950 | Greece | 27+ |
| Marianne Bachmeier | 1981 | Germany | 1 |
| Marianne Nölle | 1984 - 1992 | Germany | 7 |
| Marie Alexandrine Becker | 1933 - 1936 | Belgium | 11 |
| Marie Clement | 1880 - 1885 | USA | 4 |
| Marie Dean Arrington | 1964 - 1968 | USA | 2 |
| Marie Delphine Macarty | 1831 - 1834 | USA | 12+ |
| Marie Fikáčková | 1957 - 1960 | Czechoslovakia | 2+ |
| Marie Jeanneret | 1867 - 1868 | Switerland | 6 |
| Marie Joséphine Philippine Besnard | 1927 - 1949 | France | 13 |
| Marie Manning | 1849 | Switzerland | 1 |
| Marie Noe | 1949 - 1968 | USA | 8 |
| Marie-Fortunée Lafarge | 1840 | France | 1 |
| Marie-Thérèse Joniaux | 1892 - 1894 | Belgium | 3 |
| Marie‑Thérèse Kouao | 1999 - 2000 | Côte d'Ivoire | 1 |
| Mariëtte Sonjaleen Bosch | 1996 | South Africa | 1 |
| Mario Alberto Sulú Canché | 2007 - 2008 | Mexico | 3 |
| Mario James Jerrell Normore | 2017 | USA | 4 |
| Mario Prestifilippo | 1980 - 1987 | Italy | 1+ |
| Marion Albert Pruett | 1981 | USA | 5+ |
| Marion Bowman Jr. | 2001 | USA | 1 |
| Marion Butler Dudley | 1992 | USA | 4 |
| Marion Columbus Hedgepeth | 1880 - 1909 | USA | 2+ |
| Marissa Suzanne DeVault | 2009 | USA | 1 |
| Mariusz Krężołek | 2011 - 2012 | Poland | 1 |
| Marjorie Ann Orbin | 2004 | USA | 1 |
| Mark Alan Smith | 1969 - 1970 | USA | 4+ |
| Mark Allen Hopkinson | 1977 - 1979 | USA | 4 |
| Mark David Chapman | 1980 | USA | 1 |
| Mark Douglas Hacking | 2004 | USA | 1 |
| Mark Edward Gardner | 1985 | USA | 3 |
| Mark Fellows | 2015 - 2018 | United Kingdom | 2 |
| Mark Goudeau | 2005 - 2006 | USA | 9 |
| Mark James Asay | 1987 | USA | 2 |
| Mark James Robert Essex | 1972 - 1973 | USA | 9 |
| Mark Jensen | 1998 | USA | 1 |
| Mark Leonard Bridger | 2012 | United Kingdom | 1 |
| Mark Martin | 2004 - 2005 | United Kingdom | 3 |
| Mark Orrin Barton | 1999 | United States | 12 |
| Mark Peter Hutt | 2009 | Canada | 1 |
| Mark Philip Dixie | 1986 - 2005 | United Kingdom | 1 |
| Mark Richard Hobson | 2004 | United Kingdom | 4 |
| Mark Vijay Chahal | 1996 | Canada | 9 |
| Mark William Cunningham | 1983 | USA | 3 |
| Mark William Hofmann | 1985 | USA | 2 |
| Markeith Demangzlo Loyd | 2016 - 2017 | USA | 2 |
| Marlon Legere | 2004 | USA | 2 |
| Marquise de Brinvilliers | 1664 - 1673 | France | 3+ |
| Marshall Lee Gore | 1988 | USA | 2 |
| Martha Ann Johnson | 1977 - 1982 | USA | 1+ |
| Martha Jule Seabrook | 1947 - 1949 | USA | 3+ |
| Martha M. Place | 1899 - 1898 | USA | 1 |
| Martha Marek | 1932 - 1937 | Austria | 4 |
| Martha Needle | 1885 | Australia | 5 |
| Martha Rendell | 1907 - 1908 | Australia | 3 |
| Martha Wise | 1924 - 1925 | USA | 17 |
| Martin Dumollard | 1855 - 1861 | France | 3 |
| Martin Edward Grossman | 1984 | USA | 1 |
| Martin Goldstein | 1930 - 1940 | USA | 1+ |
| Martin John Bryant | 1996 | Australia | 35 |
| Martin Joseph Puccio Jr. | 1993 | USA | 1 |
| Martin Leach | 1983 | Australia | 2 |
| Martin Lecián | 1927 | Czechoslovakia | 4 |
| Martin Lee Sanders | 1980 - 1983 | USA | 4 |
| Martin Ney | 1992 - 2004 | Germany | 3+ |
| Martin Peyerl | 1999 | Germany | 4 |
| Martin Roháč | 1568 - 1571 | Bohemia | 59 |
| Martin Stickles | 1899 - 1900 | USA | 3 |
| Marvallous Matthew Keene | 1992 | USA | 6 |
| Marvin Charles Gabrion | 1997 | USA | 1+ |
| Marvin Francois | 1977 | USA | 6 |
| Marvin Gayle Gray | 1971 - 1992 | USA | 3+ |
| Marvin Lee Irvin | 1979 - 1990 | USA | 3 |
| Marvin Pentz Gay Sr. | 1984 | USA | 1 |
| Mary A. Cowan | 1884 - 1894 | USA | 6 |
| Mary Ann Ansell | 1899 | United Kingdom | 1 |
| Mary Ann Britland | 1886 | United Kingdom | 3 |
| Mary Ann Cotton | 1865 | United Kingdom | 19+ |
| Mary Ann Holder | 2011 | USA | 5 |
| Mary Bateman | 1780 - 1806 | United Kingdom | 1 |
| Mary Beth Harshbarger | 2006 | USA | 1 |
| Mary Blandy | 1751 | United Kingdom | 1 |
| Mary Carol Winkler | 2006 | USA | 1 |
| Mary Elizabeth Surratt | 1864 - 1865 | USA | 1 |
| Mary Elizabeth Wilson | 1955 - 1957 | United Kingdom | 2+ |
| Mary Flora Bell | 1968 | United Kingdom | 2 |
| Mary Frances Creighton | 1923 - 1935 | USA | 1+ |
| Mary Hamilton | 1715 - 1717 | Russia | 1 |
| Mary Jane Fonder | 2008 | USA | 1+ |
| Mary Jane Jackson | 1856 - 1861 | USA | 4 |
| Mary Laurine Tackett | 1992 | USA | 1 |
| Mary Mabel Bennett Rogers | 1902 | USA | 1 |
| Mary Pearcey | 1890 | United Kingdom | 1 |
| Marybeth Davis | 1981 - 1982 | USA | 2 |
| Marybeth Roe Tinning | 1974 - 1985 | USA | 9 |
| Masahiro Kanagawa | 2008 | Japan | 2 |
| Masakatsu Nishikawa | 1974 - 1991 | Japan | 5 |
| Masami Tsuchiya | 1994 - 1995 | Japan | 19 |
| Masamichi Ida | 1979 - 1983 | Japan | 3 |
| Masanori Sumida | 1987 - 2011 | Japan | 3 |
| Masten Milimu Wanjala | 2019 - 2021 | Kenya | 10 |
| Masumi Hayashi | 1998 | Japan | 4+ |
| Matej Čurko | 2009 - 2011 | Slovakia | 2 |
| Mathew Charles Lamb | 1966 | Canada | 2 |
| Matthew de Grood | 2014 | Canada | 5 |
| Matthew Eric Wrinkles | 1994 | USA | 3 |
| Matthew J. Hoffman | 2010 | USA | 3 |
| Matthew James Harris | 1998 | Australia | 3 |
| Matthew Reeves | 1996 | USA | 1 |
| Matthew Steven Johnson | 2000 - 2001 | USA | 3+ |
| Matti Haapoja | 1867 - 1894 | Finland | 3 |
| Mattias Flink | 1994 | Sweden | 7 |
| Maurice Boucher | 1973 - 2002 | Canada | 2 |
| Maurice Clemmons | 2009 | USA | 4 |
| Maurice Richard Lerner | 1962 - 1970 | USA | 2 |
| Mauricio Silva | 1978 - 1984 | USA | 4 |
| Maurizio Giugliano | 1983 - 1984 | Italy | 3+ |
| Maurizio Minghella | 1978 - 2001 | Italy | 15 |
| Maury Troy Travis | 2000 - 2002 | USA | 12+ |
| Max Gufler | 1946 - 1958 | Austria | 4 |
| Maxim Pavlov | 2014 - 2015 | Russia | 2 |
| Maxim Vladimirovich Petrov | 1999 - 2000 | Russia | 11+ |
| Maxim Yuryevich Lazovsky | 1992 - 2000 | Russia | 1+ |
| May Ruth Snyder | 1925 - 1927 | USA | 1 |
| Mechele Linehan | 1996 | USA | 1 |
| Megan Huntsman | 1996 - 2006 | USA | 6 |
| Melanie Lyn McGuire | 2004 | USA | 1 |
| Melbert Ray Ford Jr. | 1986 | USA | 2 |
| Melinda Loveless | 1992 | USA | 1 |
| Melissa Ann Shepard | 1991 | Canada | 1 |
| Melissa Drexler | 1997 | USA | 1 |
| Melissa Elizabeth Lucio | 2007 | USA | 1 |
| Melissa Huckaby | 2009 | USA | 1 |
| Melissa Margarita Calderón Ojeda | 2005 - 2015 | Mexico | 0-150 |
| Melvin Collins | 1948 | USA | 8 |
| Melvin Henry Ignatow | 1988 | USA | 1 |
| Melvin L. Knight | 2010 | USA | 1 |
| Melvin Wayne White | 1997 | USA | 1 |
| Mervin Ray Hughes | 1986 - 1999 | USA | 3+ |
| Mesac Damas | 2009 | USA | 6 |
| Micajah Harpe | 1797 - 1799 | USA | 39+ |
| Michael A. Johnson Jr. | 2008 - 2010 | USA | 4+ |
| Michael Adam Carneal | 1997 | USA | 3 |
| Michael Alig | 1996 | USA | 1 |
| Michael Angelo Morales | 1981 | USA | 1 |
| Michael Anthony Cox | 1984 | USA | 3 |
| Michael Anthony Guider | 1984 - 1986 | Australia | 1 |
| Michael Anthony Jackson | 1983 | USA | 1 |
| Michael Barrett | 1867 | Ireland | 12 |
| Michael Bruce Ross | 1981 - 1984 | USA | 8+ |
| Michael Carl George | 1979 - 1990 | USA | 2+ |
| Michael Charles Hayes | 1988 | USA | 4 |
| Michael Craig Maxwell | 1997 | USA | 2 |
| Michael Darnell Harris | 1981 - 1982 | USA | 4+ |
| Michael Dean Gonzales | 1994 | USA | 1 |
| Michael del Marco Lupo | 1986 | England | 4 |
| Michael Dewayne Smith | 2001 - 2002 | USA | 3 |
| Michael Duane Zack III | 1996 | USA | 2 |
| Michael E. Hance | 2011 | USA | 7 |
| Michael Eugene Sharp | 1982 | USA | 3 |
| Michael Eugene Sumpter | 1969 - 1973 | USA | 3 |
| Michael Frederick Griffin | 1993 | USA | 1 |
| Michael George Hart | 1976 | United Kingdom | 1 |
| Michael Hubert Hughes | 1986 - 1993 | USA | 7 |
| Michael Kent Poland | 1977 | USA | 2 |
| Michael Kiser Addison | 2006 | USA | 1 |
| Michael Lee King | 2008 | USA | 1 |
| Michael Lee Lockhart | 1987 - 1988 | USA | 3 |
| Michael Madison | 2012 - 2013 | USA | 3+ |
| Michael Manning | 1953 | Ireland | 1 |
| Michael McGay Reeves | 1989 | USA | 1+ |
| Michael Mullins | 1999 - 2012 | USA | 3 |
| Michael Ray Orndorff | 1981 | USA | 1 |
| Michael Rian Torrence | 1987 | USA | 3 |
| Michael Riley | 2006 | USA | 1 |
| Michael Robert Ryan | 1987 | United Kingdom | 16 |
| Michael Singh | 1975 - 1982 | USA | 3 |
| Michael Swango | 1981 - 1997 | USA | 60 |
| Michael Thomas Christopher Stephen Rafferty | 2009 | Canada | 1 |
| Michael Thomas Gargiulo | 1993 - 2008 | USA | 3+ |
| Michael Wayne Hunter | 1981 | USA | 2 |
| Michael Wayne McGray | 1985 - 1998 | Canada | 7+ |
| Micheal Anak Garing | 2010 | Malaysia | 1 |
| Michel Paul Fourniret | 1987 - 2003 | France | 8+ |
| Michel Peiry | 1981 - 1987 | Switzerland | 5 |
| Michele Kristen Anderson | 2007 | USA | 6 |
| Michele Profeta | 2001 | Italy | 2 |
| Michelle Knotek | 1995 - 2003 | USA | 2+ |
| Miguel Cortés Miranda | 2012 - 2024 | Mexico | 3+ |
| Mikal Deen Mahdi | 2004 | USA | 2 |
| Mikhail Novosyolov | 1977 - 1995 | Russia | 22 |
| Mikhail Viktorovich Popkov | 1992 - 2010 | Russia | 83 |
| Milena Quaglini | 1995 - 1999 | Italy | 3 |
| Miles William Giffard | 1952 | United Kingdom | 2 |
| Min Chen | 2003 | China | 1 |
| Mingdong Chen | 2013 | China | 5 |
| Miranda Kamille Dean Barbour | 2013 | USA | 1 |
| Misao Katagiri | 1965 | Japan | 1 |
| Mischa Ebner | 2001 - 2002 | Switzerland | 1 |
| Mitchell Scott Johnson | 1998 | USA | 5 |
| Miyoko Sumida | 1987 - 2011 | Japan | 8 |
| Miyuki Ishikawa | 1946 - 1948 | Japan | 5 |
| Modise Mokwadi Fly | 2006 | Botswana | 1 |
| Mohamed Salmene Lahouaiej-Bouhlel | 2016 | France | 86 |
| Mohammad Shafia | 2009 | Afghanistan | 4 |
| Mohammed Afroz | 2012 | India | 1 |
| Mohammed Beck Hadjetlaché | 1918 - 1919 | Sweden | 3 |
| Mohammed Bijeh | 2002 - 2004 | Iran | 54 |
| Mohammed Bouyeri | 2004 | Netherlands | 1 |
| Mohammed Souf | 2022 | Palestine | 3 |
| Mohan Kumar Vivekanand | 2005 - 2009 | India | 20 |
| Monroe Hickson | 1946 | USA | 4 |
| Montie Ralph Rissell | 1976 - 1977 | USA | 5+ |
| Moon Sang-rok | 1993 - 1994 | South Korea | 5 |
| Morris Bolber | 1932 - 1938 | Russia | 7 |
| Morris Odell Mason | 1978 | USA | 2 |
| Morris Solomon Jr. | 1986 - 1987 | USA | 6 |
| Moses Sithole | 1994 - 1995 | South Africa | 76 |
| Muhammad Ajmal Amir Kasab | 2007 - 2008 | Pakistan | 72 |
| Muhammad Nasir bin Abdul Aziz | 2007 | Singapore | 1 |
| Mukesh Singh | 2012 | India | 1 |
| Mukosi Freddy Mulaudzi | 1990 - 2006 | South Africa | 13 |
| Mumia Abu-Jamal | 1981 | USA | 1 |
| Munir Hussain | 1989 | Bangladesh | 1 |
| Murray Hooper | 1980 | USA | 2 |
| Muthukutty Chandran | 1985 - 1986 | India | 14 |
| Mutsuo Toi | 1938 | Japan | 30 |
| Muzzammil Syed Hassan | 2009 | Pakistan | 1 |
| Mwanza Atiba Kamau | 1995 | USA | 7 |
| Myles Brandon Sanderson | 2022 | Canada | 11 |
| Myra Hindley | 1963 - 1965 | United Kingdom | 5 |
