| MG- | Martin Garrix - The Only Way ls Up | |
| MG- | Martin Garrix - Wizard | |
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Martin Heinrich | American politician and businessman (born 1971) |
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Martin O'Malley | 61st Governor of Maryland |
| MP | Martin Prince | fictional character from The Simpsons |
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Martin Rees | British cosmologist and astrophysicist (1942-) |
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Martin Schulz | German politician |
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Martin Sorrell | British businessman |
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Martti Ahtisaari | President of Finland from 1994 to 2000 |
| MH | Marvin Heemeyer | American news figure (1951–2004) |
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Marvin the Paranoid Android | fictional character from The Hitchhiker's Guide to the Galaxy pentalogy |
| MA | Mary Amberley | fictional character from Eyeless in Gaza |
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Mary Beard | English classicist (born 1955) |
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Mary Elizabeth Winstead | American actress (born 1984) |
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Mary J. Blige | American singer (born 1971) |
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Mary-Kate Olsen | American businesswoman and actress (born 1986) |
| MM | Mary Morgan | commentator |
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Mary of Teck | Queen consort of the United Kingdom from 1910 to 1936 |
| MO | Mary Oliver | American poet (1935–2019) |
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Mary, Queen of Scots | Queen of Scotland from 1542 to 1567 (1542–1587) |
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Mary Wollstonecraft | English writer and intellectual (1759–1797) |
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Marzia Kjellberg | Italian YouTuber |
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Masahiro Sakurai | Japanese video game designer (born 1970) |
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Masami Akita | Japanese noise musician and writer (1956-) |
| MH | Mason Hartman | tweeter |
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Massachusetts | state of the United States of America |
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Massachusetts Institute of Technology | private university in Cambridge, Massachusetts, USA, founded 1861 |
| M | Master | fictional character from Mad Max Beyond Thunderdome |
| MOM | Master of Masters | fictional character from Kingdom Hearts |
| MO | Master Oogway | fictional character from Kung Fu Panda |
| MS | Master Shifu | fictional character from Kung Fu Panda |
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Matamela Cyril Ramaphosa | President of South Africa since 2018 |
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Mate Rimac | Croatian inventor and entrepreneur |
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Mathieu van der Poel | Dutch cyclist, cyclo-cross and road racing |
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Matilda Wormwood | fictional character from Matilda |
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Matsuo Bashō | Japanese poet (1644–1694) |
| MT | Matsuri Tendou | fictional character from 7 Seeds |
| MC | Matt Cutshall | Musical artist |
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Matt Dillon | American actor |
| MC | Matteo Capucci | mathematician |
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Matt Fradd | American author and podcaster (born 1983) |
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Matt Gaetz | United States Representative from Florida from 2017 to 2024 (born 1982) |
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Matt Hancock | British politician (born 1978) |
| MC | Matthew Capodicasa | Playwright, professional entertainer and RPG player |
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Matthew Cox | American convicted felon for bank fraud and now a YouTuber |
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Matthew Fox | American actor (born 1966) |
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Matthew Goode | English actor (born 1978) |
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Matthew Lesko | American television personality |
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Matthew Macfadyen | English actor |
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Matthew Perryman Jones | American singer-songwriter |