| McFarland, Olive | Olive McFarland | Actor | 1959 | 2 | 1 |
| McCarthy, Mary | Mary McCarthy | Actor | 1959 | 1 | 1 |
| Mowls, Shirley | Shirley Mowls | Actor | 1959 | 1 | 1 |
| Mellvig, Börje | Börje Mellvig | Actor, Director | 1936 - 1958 | 5 | 1 |
| McDonald, Hugh | Hugh McDonald | Actor | 1958 | 1 | 1 |
| McDonald, Peg | Peg McDonald | Actor | 1958 | 1 | 1 |
| Malkin, B. | B. Malkin | Director | 1957 | 1 | 1 |
| Morton, Clive | Clive Morton | Actor | 1957 - 1958 | 2 | 1 |
| Moe, Ove | Ove Moe | Actor | 1953 - 1956 | 2 | 1 |
| Moreno, Ricardo | Ricardo Moreno | Designer, Lighting Designer | 1956 | 2 | 1 |
| Marinkovic, Rados | Rados Marinkovic | Costume Designer | 1956 | 1 | 1 |
| Marber, Patrick Albert Crispin | Patrick Albert Crispin Marber | Adaptation, Translator | 2016 - 2023 | 7 | 1 |
| Macdonald, Murray | Murray Macdonald | Director | 1955 | 1 | 1 |
| Mittler, Leo | Leo Mittler | Director | 1953 | 1 | 1 |
| Meysel, Inge | Inge Meysel | Actor | 1953 | 1 | 1 |
| Middleton, Robert | Robert Middleton | Actor | 1951 | 1 | 1 |
| March, Fredric | Fredric March | Actor | 1950 | 1 | 1 |
| Maurice, Joël | Joël Maurice | Actor | 2000 | 1 | 1 |
| Maccie, Liz | Liz Maccie | Actor | 1998 - 1999 | 2 | 1 |
| Mussbach, Peter | Peter Mussbach | Director | 1998 | 1 | 1 |
| Margid, Elizabeth | Elizabeth Margid | Director | 1998 | 1 | 1 |
| Maré, Quentin | Quentin Maré | Actor | 2000 | 1 | 1 |
| Matthews, Douglas | Douglas Matthews | Actor | 1935 - 1936 | 2 | 1 |
| Marquet, Mary | Mary Marquet | Actor | 1936 | 1 | 1 |
| Macowan, Michael | Michael Macowan | Producer | 1936 | 1 | 1 |
| Miranda, Pia | Pia Miranda | Actor | 1999 | 2 | 1 |
| Maltrana, Isidro | Isidro Maltrana | Adaptation | 1999 | 1 | 1 |
| Melletin, Birgitte | Birgitte Melletin | Costume Designer, Designer | 1999 | 2 | 1 |
| McClure, Trina | Trina McClure | Actor | 1999 | 1 | 1 |
| Mabley, Edward | Edward Mabley | Director | 1937 | 1 | 1 |
| Müller, Paul | Paul Müller | Actor | 1921 - 1928 | 10 | 1 |
| Mechlenburg, Fritz | Fritz Mechlenburg | Conductor | 1940 | 1 | 1 |
| Magnuson, Sven | Sven Magnuson | Actor | 1941 | 1 | 1 |
| Markham, David | David Markham | Actor | 1945 - 1961 | 4 | 1 |
| Massute, Hendrik | Hendrik Massute | Actor | 2000 | 1 | 1 |
| Mullins, Laurena | Laurena Mullins | Actor | 2000 | 2 | 1 |
| Mörner, Stellan | Stellan Mörner | Designer | 1947 | 1 | 1 |
| Molins, Raimon | Raimon Molins | Actor | 2000 | 1 | 1 |
| Malleson, Miles | Miles Malleson | Actor | 1948 | 1 | 1 |
| Moskovljević, Miloš | Miloš Moskovljević | Translator | 2000 - 2013 | 2 | 1 |
| Maločevskaja, Irina | Irina Maločevskaja | Dramaturg | 2014 - 2018 | 2 | 1 |
| McHale, Rosemary | Rosemary McHale | Actor | 1977 | 6 | 1 |
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