| Khaled Mashal | Palestinian terrorist | 1956 |
| Hiro Mashima | Japanese manga artist | 1977 |
| Isaac Mashman | businessman, speaker | 2000 |
| Donna Masini | American writer | 1954 |
| Mokgweetsi Masisi | President of Botswana | 1962 |
| Neo Masisi | first lady of Botswana | 1962 |
| Aslan Maskhadov | Chechen warlord | 1951–2005 |
| Eric Maskin | American Nobel laureate in ec… | 1950 |
| Abraham Maslow | American psychologist | 1908–1970 |
| Carole Maso | American writer | 1956 |
| Andrew Mason | businessman | 1981 |
| Basil John Mason | British meteorologist | 1923–2015 |
| Bobbie Ann Mason | American writer | 1940 |
| Edward S. Mason | American economist | 1899–1992 |
| George Mason | American delegate from Virgin… | 1725–1792 |
| Herbert Mason | British film director and pro… | 1891–1960 |
| Jackie Mason | American rabbi and comedian | 1931 |
| John Mason | English Independent minister … | 1706–1763 |
| John M. Mason | American Doctor of Divinity | 1770–1829 |
| Lisa Mason | writer of science fiction | 1953 |
| Wendy Mass | American children's writer | 1967 |
| Joseph Massad | Associate Professor of Arab S… | 1963 |
| Isaac Amani Massawe | Tanzanian Roman Catholic arch… | 1951 |
| Emilio Massera | Argentine military officer | 1925–2010 |
| Gerald Massey | British poet | 1828–1907 |
| Vincent Massey | Governor General of Canada | 1887–1967 |
| Robert K. Massie | Historian, writer | 1929–2019 |
| Jean Baptiste Massillon | French Catholic bishop and fa… | 1663–1742 |
| Philip Massinger | English writer | 1583–1640 |
| Jeffrey Moussaieff Masson | American writer and activist | 1941 |
| Thomas Lansing Masson | American journalist | 1866–1934 |
| Ahmad Shah Massoud | Afghan military leader | 1953–2001 |
| John Masterman | | |
| Edgar Lee Masters | American writer | 1868–1950 |
| Graham Masterton | British writer | 1946 |
| Marcello Mastroianni | Italian actor | 1924–1996 |
| Ghazi Saiyyad Salar Masud | semi-legendary Muslim figure … | 1014 |
| David Mas Masumoto | American farmer | |
| Fiamē Naomi Mata'afa | Samoan politician | 1957 |
| Petero Mataca | Catholic archbishop | 1933–2014 |
| Mary Matalin | American political consultant | 1953 |
| Hisham Matar | American writer | 1970 |
| Paul Youssef Matar | | 1941 |
| Carol Matas | Canadian writer | 1949 |
| Rubén Ramírez Mateo | Peruvian lawyer | 1965 |
| Cotton Mather | American religious minister a… | 1663–1728 |
| Increase Mather | Puritan minister, academic, a… | 1639–1723 |
| Stephen Mather | | |
| Richard Matheson | American fiction writer | 1926–2013 |
| Angelo Mathews | Sri Lankan cricketer | 1987 |
| Dan Mathews | American activist | 1964 |
| George Ballard Mathews | British mathematician | 1861–1922 |
| Tyrann Mathieu | All-American college football… | 1992 |
| Samir D. Mathur | Indian physicist | |
| Bimal Krishna Matilal | Indian philosopher | 1935–1991 |
| James Matisoff | linguist | 1937 |
| Henri Matisse | French artist | 1869–1954 |
| Matka Tereza | Roman Catholic saint of Alban… | 1910–1997 |
| Stuart M. Matlins | Religious scholar | 1940–2019 |
| Igor Matovič | Slovak politician | 1973 |
| Iwane Matsui | Japanese general | 1878–1948 |
| Yukihiro Matsumoto | Japanese computer scientist | 1965 |
| Bashō Matsuo | Japanese poet | 1644–1694 |
| Sergio Mattarella | 12th President of Italy | 1941 |
| Patrick Matthew | British scientist | 1790–1874 |
| Andrew Matthews | British writer | 1948 |
| Brian Matthews | | |
| Chris Matthews | American news anchor | 1945 |
| Dave Matthews | American singer-songwriter, m… | 1967 |
| Paul Taunton Matthews | British scientist | 1919–1987 |
| R. C. O. Matthews | British economist | 1927–2010 |
| Peter Matthiessen | American novelist | 1927–2014 |
| Mattin | Spanish musician | 1977 |
| James Mattis | 26th and current United State… | 1950 |
| Charles P. Mattocks | American soldier, lawyer and … | 1840–1910 |
| Humberto Maturana | Chilean biologist and philoso… | 1928 |
| Charles Maturin | Irish writer | 1782–1824 |
| Bruce Mau | Canadian graphic designer | 1959 |
| Renée Mauborgne | American economist | |
| Reginald Maudling | British politician | 1917–1979 |
| Henry Maudsley | British psychiatrist | 1835–1918 |
| Abul A'la Maududi | Indian theologian, politician… | 1903–1979 |
| Robin Maugham | British novelist, playwright … | 1916–1981 |
| W. Somerset Maugham | British playwright, novelist,… | 1874–1965 |
| Bill Mauldin | American editorial cartoonist | 1921–2003 |
| William Henry Maule | British politician | 1788–1858 |
| Edward Walter Maunder | English astronomer studying s… | 1851–1928 |
| Guy De Maupassant | French writer | 1850–1893 |
| Pierre Louis Maupertuis | French mathematician, philoso… | 1698–1759 |
| Armistead Maupin | American writer | 1944 |
| Francois Mauriac | French author | 1885–1970 |
| Frederick B. Maurice | British Army general and hist… | 1871–1951 |
| Julianna Rose Mauriello | Nieta de. Tesla | 1991 |
| Daphne du Maurier | British writer | 1907–1989 |
| George du Maurier | French-British cartoonist and… | 1834–1896 |
| Tullio De Mauro | Italian linguist | 1932–2017 |
| André Maurois | French writer | 1885–1967 |
| Fritz Mauthner | Austrian writer | 1849–1923 |
| Anton Mauve | Dutch painter (1838–1888) | 1838–1888 |
| Douglas Mawson | Australian geologist, Antarct… | 1882–1958 |
