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- Joseph Macaulay by Alex Gard (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- Shirley MacLaine by Don Bevan
- Jeanette MacDonald by Alex Gard (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- Bruce MacFarlane by Alex Gard (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- Dorothy Mackaill by Alex Gard (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- Kenneth MacKenna by Alex Gard (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- Will Mahoney by Alex Gard (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- John Malkovich by Richard Baratz
- Louis Mann by Alex Gard (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- Terrence Mann
- Joe Mantello
- Arthur Margetson by John Mackey (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- Constantine Maroulis (Rock of Ages, 18 March 2010)
- Marian Marsh by Alex Gard (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- Everett Marshall by Alex Gard (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- Bob Martin (The Drowsy Chaperone, 27 December 2006)
- The Marx Brothers by Alex Gard
- Raymond Massey
- Walter Matthau by Don Bevan
- Marin Mazzie (Kiss Me, Kate, 4 May 2000)
- Andrea McArdle (Beauty and the Beast, 26 January 2000)
- Jack McCauley by Alex Gard (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- John McClain by Don Bevan (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- Guthrie McClintic
- Rob McClure (Chaplin, 14 November 2012)
- Mildred McCoy by Alex Gard (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- Audra McDonald (Ragtime, 17 December 1998)
- Michael McGrath
- Jimmy McHugh by Alex Gard (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- Ian McKellen by Richard Baratz
- Harry McNaughton by Alex Gard (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- Janet McTeer
- Lynne Meadow (October 24, 2012)
- Audrey Meadows by Don Bevan
- Jayne Meadows by Don Bevan
- Anne Meara (Richard Baratz)
- John Henry Mears (Producer, Lyricist) by Alex Gard (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- Burgess Meredith
- Philip Merivale by Alex Gard (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- Ethel Merman
- David Merrick
- Sir John Mills
- Ann Miller (Sugar Babies, 1979)
- Arthur Miller
- Ernst Miller by Alex Gard (Housed in the Billy Rose Theatre Collection of the New York Public Library
- Marilyn Miller by Alex Gard (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- Mitch Miller by Don Bevan
- Patsy Ruth Miller by Alex Gard (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- Liza Minnelli
- Thomas Mitchell by Alex Gard (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- Alfred Molina (Fiddler on the Roof, 4 August 2004)
- Ricardo Montalban by Don Bevan
- Mary Tyler Moore by Richard Baratz
- Ward Morehouse by Alex Gard (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- Claudia Morgan by Alex Gard (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- Frank Morgan by Alex Gard (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- Helen Morgan by Alex Gard (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- Robert Morley
- Dave E. Morris by Alex Gard (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- Robert Morse by Don Bevan
- Charles B. Moskowitz by Alex Gard (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- Zero Mostel
- Alan Mowbray by Alex Gard (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- Paul Muni by Alex Gard (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- Ona Munson by Alex Gard (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- Arthur Murray by Don Bevan (Housed in the Billy Rose Theatre Collection of the New York Public Library)
- Kathryn Murray by Don Bevan (Housed in the Billy Rose Theatre Collection of the New York Public Library)
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