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- Magnolia (1999) - Tom Cruise
- The Maltese Falcon (1941) - Sydney Greenstreet
- A Man for All Seasons (1966) - Robert Shaw
- Marathon Man (1976) - Laurence Olivier
- Marie Antoinette (1938) - Robert Morley
- Married to the Mob (1988) - Dean Stockwell
- Marty (1955) - Joe Mantell
- A Medal for Benny (1945) - J. Naish
- Melvin and Howard (1980) - Jason Robards
- The Messenger (2009) - Woody Harrelson
- Michael Clayton (2007) - Tom Wilkinson
- Midnight Express (1978) - John Hurt
- Milk (2008) - Josh Brolin
- Million Dollar Baby (2004) - Morgan Freeman
- Miracle on 34th Street (1947) - Edmund Gwenn
- Mister 880 (1950) - Edmund Gwenn
- Mister Roberts (1955) - Jack Lemmon
- Moneyball (2011) - Jonah Hill
- Moonstruck (1987) - Vincent Gardenia
- The More the Merrier (1943) - Charles Coburn
- Mr. Skeffington (1944) - Claude Rains
- Mr. Saturday Night (1992) - David Paymer
- Mr. Smith Goes to Washington (1939) - Harry Carey
- Mr. Smith Goes to Washington (1939) - Claude Rains
- Mrs. Miniver (1942) - Henry Travers
- Murder, Inc. (1960) - Peter Falk
- My Cousin Rachel (1952) - Richard Burton
- My Fair Lady (1964) - Stanley Holloway
- My Man Godfrey (1936) - Mischa Auer
- My Week with Marilyn (2011) - Kenneth Branagh
- Mystic River (2003) - Tim Robbins
Read more about this topic: List Of Nominees For The Academy Award For Best Supporting Actor (by Film Title)