| Terence McKenna | American ethnobotanist | 1946–2000 |
| Loreena McKennitt | Canadian musician and composer | 1957 |
| Donal McKeown | Roman Catholic bishop | 1950 |
| Bill McKibben | American environmentalist and… | 1960 |
| Patricia A. McKillip | American fantasy writer | 1948 |
| Robin McKinley | American fantasy writer | 1952 |
| William McKinley | American politician, 25th pre… | 1843–1901 |
| Rod McKuen | American poet, songwriter, co… | 1933–2015 |
| Sarah McLachlan | Canadian musician, singer, an… | 1968 |
| Ron McLarty | American actor and writer | 1947–2020 |
| Emma McLaughlin | American writer | 1974 |
| John McLaughlin | guitarist, founder of the Mah… | 1942 |
| Mignon McLaughlin | American journalist | 1913–1983 |
| Don McLean | American Singer and songwriter | 1945 |
| Isaac McLellan | American writer | 1806–1899 |
| John Cunningham McLennan | Canadian physicist | 1867–1935 |
| Ken McLeod | Canadian lama | 1948 |
| Marshall McLuhan | Canadian educator, philosophe… | 1911–1980 |
| Jennifer McMahon | American writer | 1968 |
| Linda McMahon | 25th Administrator of the Sma… | 1948 |
| Steve McManaman | English footballer | 1972 |
| Joseph McManners | British singer, actor | 1992 |
| Erwin Raphael McManus | Salvadoran minister | 1958 |
| Patrick F. McManus | American journalist | 1933–2018 |
| H. R. McMaster | 26th United States National S… | 1962 |
| Terry McMillan | American author | 1951 |
| Edward McMillan-Scott | British politician | 1949 |
| Evan McMullin | American political candidate | 1976 |
| Grady Louis McMurtry | United States Army officer | 1918–1985 |
| Larry McMurtry | American novelist, essayist, … | 1936 |
| David McNally | Canadian political scientist | 1953 |
| Robert S. McNamara | American businessman and Secr… | 1916–2009 |
| Roger McNamee | American musician | 1956 |
| Judith McNaught | American writer | 1944 |
| Brian McNaughton | US author | 1935–2004 |
| Scott McNealy | American businessman | 1954 |
| Hector McNeil | | |
| Graham McNeill | writer | 1971 |
| William H. McNeill | Canadian historian | 1917–2016 |
| Merrill McPeak | United States Air Force gener… | 1936 |
| John McPhee | American writer | 1931 |
| Katharine McPhee | American pop singer, songwrit… | 1984 |
| James M. McPherson | American historian | 1936 |
| Linda McQuaig | journalist and author | 1951 |
| Alexander McQueen | British fashion designer and … | 1969–2010 |
| William H. McRaven | United States admiral | 1955 |
| Robert McRuer | American academic | 1966 |
| J. M. E. McTaggart | British philosopher | 1866–1925 |
| Timothy McVeigh | American army soldier, securi… | 1968–2001 |
| John McWhorter | American linguist and politic… | 1965 |
| James E. McWilliams | American historian | 1968 |
| Peter McWilliams | American author and civil lib… | 1949–2000 |
| Carver Mead | American computer scientist | 1934 |
| George Herbert Mead | American philosopher, sociolo… | 1863–1931 |
| Margaret Mead | American anthropologist | 1901–1978 |
| Richard Mead | British physician | 1673–1754 |
| Richelle Mead | American writer | 1976 |
| Syd Mead | American concept artist | 1933–2019 |
| George Meade | Union Army general | 1815–1872 |
| James Meade | British economist | 1907–1995 |
| Donella Meadows | American environmental scient… | 1941–2001 |
| Mark Meadows | North Carolina politician and… | 1959 |
| Thomas Taylor Meadows | British sinologist and diplom… | 1815–1868 |
| Karen Meagher | British actress | |
| Thomas Francis Meagher | Irish nationalist & American … | 1823–1867 |
| Colm Meaney | Irish actor | 1953 |
| Gardiner C. Means | American economist | 1896–1988 |
| Russell Means | Oglala Lakota activist for th… | 1939–2012 |
| John Mearsheimer | American political scientist | 1947 |
| L. David Mech | American Biologist , Ecologist | 1937 |
| David Medalla | Filipino artist | 1942 |
| Peter Medawar | scientist | 1915–1987 |
| Teresa Medeiros | American writer | 1962 |
| Cosimo de' Medici | First ruler of the Medici pol… | 1389–1464 |
| Danilo Medina | President of the Dominican Re… | 1951 |
| Rubén González Medina | Roman Catholic bishop | 1949 |
| Jillian Medoff | American writer | 1963 |
| Hugo Medrano | director, playwright, and act… | |
| Michael Medved | American radio host | 1948 |
| Dmitry Medvedev | Russian Prime Minister and fo… | 1965 |
| Arthur Mee | British journalist and writer | 1875–1943 |
| Paul E. Meehl | American psychologist | 1920–2003 |
| Joseph Meek | American mountain man, pionee… | 1810–1875 |
| Mary Meeker | American venture capitalist a… | 1959 |
| Travis Meeks | American musician | 1979 |
| Simon van der Meer | Dutch physicist | 1925–2011 |
| Ruben Vergara Meersohn | Entrepreneur | 1991 |
| Theognis of Megara | Greek lyric poet active in ap… | -570–-485 BC |
| Ved Mehta | Indian writer | 1934 |
| Zubin Mehta | Indian conductor | 1936 |
| Yuan Mei | | |
| Sid Meier | Canadian-American game progra… | 1954 |
| Soong Mei-ling | Chiang Kai-shek's wife, First… | 1897–2003 |
| Klaus Meine | German singer | 1948 |
| Ulrike Meinhof | German left-wing militant | 1934–1976 |
| Golda Meir | former prime minister of Isra… | 1898–1978 |
| Jessica Meir | Swedish-American marine biolo… | 1977 |
| Lev Mekhlis | Soviet politician | 1889–1953 |
| Alexander Melamid | Russian artist | 1945 |
| Philip Melanchthon | German reformer | 1497–1560 |
