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MASH (1970) - Sally Kellerman
The Madness of King George (1994) - Helen Mirren
The Magnificent Ambersons (1942) - Agnes Moorehead
A Man for All Seasons (1966) - Wendy Hiller
The Manchurian Candidate (1962) - Angela Lansbury
Manhattan (1979) - Mariel Hemingway
Marty (1955) - Betsy Blair
Melvin and Howard (1980) - Mary Steenburgen
Merrily We Live (1938) - Billie Burke
Michael Clayton (2007) - Tilda Swinton
Midnight Cowboy (1969) - Sylvia Miles
Mighty Aphrodite (1995) - Mira Sorvino
Mildred Pierce (1945) - Eve Arden
Mildred Pierce (1945) - Ann Blyth
Mississippi Burning (1988) - Frances McDormand
Mogambo (1953) - Grace Kelly
The Mating Season (1951) - Thelma Ritter
The Miracle Worker (1962) - Patty Duke
The Mirror Has Two Faces (1996) - Lauren Bacall
Moonstruck (1987) - Olympia Dukakis
Moulin Rouge (1952) - Colette Marchand
Mrs. Miniver (1942) - May Whitty
Mrs. Miniver (1942) - Teresa Wright
Mrs. Parkington (1944) - Agnes Moorehead
Murder on the Orient Express (1974) - Ingrid Bergman
My Cousin Vinny (1992) - Marisa Tomei
My Fair Lady (1964) - Gladys Cooper
My Left Foot (1989) - Brenda Fricker
My Man Godfrey (1936) - Alice Brady
Mystic River (2003) - Marcia Gay Harden
Read more about this topic: List Of Nominees For The Academy Award For Best Supporting Actress (by Film Title)