| Constantinos C. Markides | Cypriot business theorist | 1960 |
| Markiplier | American YouTuber and Interne… | 1989 |
| Merrill Markoe | American writer | 1948 |
| Mirjana Markovic | Serbian politician | 1942–2019 |
| Harry Markowitz | American economist | 1927 |
| David Markson | American writer | 1927–2010 |
| Karl Marlantes | Businessman, novelist | 1944 |
| John Churchill, 1st Duke of Marlborough | English soldier and statesman | 1650–1722 |
| Bob Marley | Jamaican singer, songwriter, … | 1945–1981 |
| Ziggy Marley | Jamaican musician | 1968 |
| Randal Marlin | Canadian academic | 1938 |
| Alexander Marlow | american journalist | 1986 |
| Christopher Marlowe | English dramatist, poet and t… | 1564–1593 |
| Ari Marmell | D&D game writer | 1974 |
| Michael Marmot | Professor of Epidemiology and… | 1945 |
| Tonko Maroević | | 1941 |
| Marc Maron | Comedian | 1963 |
| Margaret Maron | American crime fiction writer | |
| Martin Marprelate | | 1588–1589 |
| Friedrich-Wilhelm Marquardt | German theologian | 1928–2002 |
| Albert Marquet | French artist | 1875–1947 |
| Rocky Marquette | American film actor | 1980 |
| Gabriel García Márquez | Colombian writer | 1927–2014 |
| Don Marquis | American writer | 1878–1937 |
| Andrew Marr | British journalist | 1959 |
| David Marr | British neuroscientist and ps… | 1945–1980 |
| Johnny Marr | musician | 1963 |
| Melissa Marr | | |
| Albert Marrin | American historian | 1936 |
| Texe Marrs | American writer | 1944–2019 |
| AnnMaria De Mars | American judoka | 1958 |
| Wynton Marsalis | American jazz musician | 1961 |
| Brian G. Marsden | British astronomer | 1937–2010 |
| John Marsden | author | 1950 |
| Rachel Marsden | journalist | 1974 |
| Dave Marsh | American music critic, author… | 1950 |
| Jeff "Swampy" Marsh | American television director,… | 1960 |
| Jodie Marsh | English glamour model and tel… | 1978 |
| Ngaio Marsh | New Zealand writer | 1895–1982 |
| Richard Marsh | | |
| Alfred Marshall | British economist | 1842–1924 |
| Andrew Marshall | the director of the United St… | 1921–2019 |
| George Marshall | US military leader, Army Chie… | 1880–1959 |
| John Marshall | fourth Chief Justice of the U… | 1755–1835 |
| Josh Marshall | American journalist | 1969 |
| Leon C. Marshall | American economist | 1879–1966 |
| Peter Marshall | American preacher | 1902–1949 |
| S.L.A. Marshall | United States Army general an… | 1900–1977 |
| Thomas R. Marshall | American politician who serve… | 1854–1925 |
| Thurgood Marshall | Associate Justice of the Unit… | 1908–1993 |
| James Marsters | American actor | 1962 |
| John Marston | English writer | 1576–1634 |
| William Moulton Marston | American psychologist, lawyer… | 1893–1947 |
| Yann Martel | Canadian author best known fo… | 1963 |
| Vincent Martella | American actor | 1992 |
| José Martí | Poet, writer, Cuban nationali… | 1853–1895 |
| Martial | Latin poet from Hispania | 40–104 |
| Abby Martin | American journalist | 1984 |
| Agnes Martin | American artist | 1912–2004 |
| Ann M. Martin | American writer of children's… | 1955 |
| Billy Martin | American baseball player and … | 1928–1989 |
| Chris Martin | musician, co-founder of Coldp… | 1977 |
| Dean Martin | American singer, actor, comed… | 1917–1995 |
| Emer Martin | Irish writer | 1968 |
| Eugene J. Martin | American artist | 1938–2005 |
| Everett Dean Martin | | 1880–1941 |
| George Raymond Richard Martin | American writer, screenwriter… | 1948 |
| Henno Martin | German geologist | 1910–1998 |
| John Martin | (1812-1875) Irish nationalist… | 1812–1875 |
| John H. Martin | | |
| Judith Martin | American etiquette expert | 1938 |
| Mary Martin | American actress | 1913–1990 |
| Meaghan Martin | American musician and actor | 1992 |
| Paul Martin | 21st Prime Minister of Canada | 1938 |
| Ricky Martin | singer from Puerto Rico | 1971 |
| Robert C. Martin | American software consultant | 1952 |
| Steve Martin | American actor, comedian, mus… | 1945 |
| Troy Kennedy Martin | British screenwriter | 1932–2009 |
| Valerie Martin | American writer | 1948 |
| José de San Martín | Argentine general and indepen… | 1778–1850 |
| Arkady Martine | Science fiction author | 1985 |
| Harriet Martineau | English writer and sociologist | 1802–1876 |
| James Martineau | English religious philosopher | 1805–1900 |
| Alessandra Martines | Italian dancer and actor | 1963 |
| A. Lee Martinez | Author | 1973 |
| Elizabeth Martinez | American community organizer,… | 1925 |
| Justo Gallego Martínez | Ex-monk and sole builder of a… | 1925–2021 |
| Obafemi Martins | Nigerian footballer | 1984 |
| Justin Martyr | early Christian martyr | 100–165 |
| Andrew Marvell | English metaphysical poet and… | 1621–1678 |
| Abd al-Malik ibn Marwan | 5th Umayyad caliph | 646–705 |
| Groucho Marx | American comedian | 1890–1977 |
| Harpo Marx | American comedian | 1888–1964 |
| Karl Marx | German philosopher, economist… | 1818–1883 |
| Brownie Mary | American medical cannabis act… | 1922–1999 |
| Quintin Hogg, Baron Hailsham of St Marylebone | British judge, politician, li… | 1907–2001 |
| Theo Marzials | Anglo-French poet and eccentr… | 1850–1920 |
| Tomáš Garrigue Masaryk | First Czechoslovak president | 1850–1937 |
| Joseph Masclet | | |
| John Masefield | English poet and writer | 1878–1967 |
