- Margaret Walker
- Margo Kaufman
- Margot Asquith
- Marguerite Gardiner, Countess of Blessington
- Marguerite Yourcenar
- Maria Bamford
- Maria Edgeworth
- Marian Anderson
- Marian Erickson
- Marian Wright Edelman
- Marianne Williamson
- Marie Curie
- Marie de Rabutin-Chantal
- Marie Dressler
- Marie von Ebner-Eschenbach
- Marilyn Ferguson
- Marilyn Manson
- Marilyn Moats Kennedy
- Marilyn Monroe
- Marilyn vos Savant
- Marina Tsvetaeva
- Mario Andretti
- Mario Fernandez
- Mario Puzo
- Marion Barry Jr.
- Marion Milner
- Mark Beltaire
- Mark Bittman
- Mark Caine
- Mark Russell
- Mark Solon
- Mark Twain
- Mark Van Doren
- Mark Victor Hansen
- Markus Zusak
- Marquis de Condorcet
- Marquis de Sade
- Marshal Petain
- Marshall Field
- Marshall Lumsden
- Marshall McLuhan
- Martha Graham
- Martha Grimes
- Marthe Troly-Curtin
- Martin Buxbaum
- Martin Charnin
- Martin Farquhar Tupper
- Martin H. Fischer
- Martin Henry Fischer
- Martin Luther