| Mason, Dan | Dan Mason | Actor | 1996 - 2013 | 3 | 1 |
| Matveeva, Svetlana | Svetlana Matveeva | Actor, Costume Designer, Designer | 2001 | 3 | |
| Matysová, Milada | Milada Matysová | Actor | 1939 - 1954 | 3 | 1 |
| Matz, Katharina | Katharina Matz | Actor | 1956 - 1985 | 3 | |
| Mavromataki, Kelly | Kelly Mavromataki | Costume Designer | 2006 | 3 | |
| McCallum, Paul | Paul McCallum | Actor | 1970 | 3 | |
| McCoy, Michael | Michael McCoy | Sound Designer | 1992 | 3 | |
| McHallem, Christopher | Christopher McHallem | Actor | 1992 | 3 | 1 |
| McRae, Hilton | Hilton McRae | Actor | 1993 - 2003 | 3 | |
| McTeer, Janet | Janet McTeer | Actor | 1996 - 1997 | 3 | 2 |
| Medina, Estela | Estela Medina | Actor | 1954 - 1979 | 3 | |
| Mehring, Horst | Horst Mehring | Actor | 1971 - 1975 | 3 | |
| Melldahl, Åsa | Åsa Melldahl | Director | 2000 - 2007 | 3 | 1 |
| Mellor, Harold | Harold Mellor | Actor | 1963 - 1977 | 3 | |
| Meshulach, Rivka | Rivka Meshulach | Adaptation, Translator | 1999 - 2013 | 3 | 1 |
| Metcalfe, Edgar | Edgar Metcalfe | Director | 1970 | 3 | |
| Meunier, Enny | Enny Meunier | Actor | 1955 - 1977 | 3 | |
| Meyer, Wilhelm | Wilhelm Meyer | Actor | 1976 - 1980 | 3 | |
| Micińska, Magdalena | Magdalena Micińska | Actor | 1882 - 1908 | 3 | |
| Miles, Katrina | Katrina Miles | Actor | 2005 - 2006 | 3 | |
| Millot, Charles | Charles Millot | Actor | 1957 - 1980 | 3 | |
| Minot, Anna | Anna Minot | Actor | 1950 - 1995 | 3 | 1 |
| Mochizuki, Michiharu | Michiharu Mochizuki | Actor | 1983 - 1994 | 3 | |
| Modén, Mirja | Mirja Modén | Actor | 1989 - 1991 | 3 | |
| Mooney, Ria | Ria Mooney | Actor | 1923 - 1925 | 3 | |
| Moore, Mary | Mary Moore | Costume Designer, Designer | 1989 - 1990 | 3 | 1 |
| Morelli, Richard | Richard Morelli | Director | 1949 - 1959 | 3 | |
| Morrow, Helen | Helen Morrow | Actor | 1929 | 3 | |
| Moser, Wolfgang | Wolfgang Moser | Designer | 1960 - 1977 | 3 | |
| Mueller, Johannes | Johannes Mueller | Sound Designer | 2006 | 3 | |
| Müller, Gert | Gert Müller | Composer, Dramaturg | 1981 - 1996 | 3 | |
| Müller, Manfred | Manfred Müller | Actor | 1965 - 1982 | 3 | |
| Müller, Ursula | Ursula Müller | Costume Designer, Dancer, Designer | 1956 - 1995 | 3 | |
| Murase, Sachiko | Sachiko Murase | Actor | 1928 - 1976 | 3 | |
| Murphy, John | John Murphy | Actor | 1971 - 2000 | 3 | |
| Murtagh-Monks, Annie | Annie Murtagh-Monks | Actor | 1982 - 1991 | 3 | |
| Mutter, Johannita | Johannita Mutter | Costume Designer, Mask Maker | 2004 - 2014 | 3 | |
| Muzzolon, Marco | Marco Muzzolon | Designer | 1999 - 2014 | 3 | |
| Myers, Scott | Scott Myers | Sound Designer | 1996 - 1997 | 3 | |
| Manni, Tarmo | Tarmo Manni | Actor | 1955 - 1973 | 3 | |
| Magazzari, Ms. | Ms. Magazzari | Actor | 1891 - 1892 | 3 | |
| Maraval, - | - Maraval | Actor | 1921 - 1926 | 3 | |
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