| Municchi, Andrea | Andrea Municchi | Actor | 1977 | 4 | |
| McKeating, Cealach | Cealach McKeating | Assistant Director | 2017 | 4 | |
| Mårtensson, Klara | Klara Mårtensson | Actor | 2017 - 2019 | 4 | |
| Michaïlidis, Giorgos | Giorgos Michaïlidis | Composer, Director | 1984 - 1985 | 4 | |
| Muscan, Gr. | Gr. Muscan | Actor | 1920 - 1922 | 4 | |
| Miklósy, Margit | Margit Miklósy | Actor | 1925 | 4 | |
| Mansvjetova, Lidija | Lidija Mansvjetova | Actor, Director | 1924 | 4 | |
| Martín, María | María Martín | Actor, Adaptation | 1971 | 4 | |
| Michelsen, Anna, | Anna Michelsen | Actor | 1880 - 1881 | 3 | |
| Mihályfi, Béla | Béla Mihályfi | Actor | 1928 | 3 | |
| Manz, Andreas | Andreas Manz | Actor, Director | 2007 - 2009 | 3 | |
| Malcolm, Roy | Roy Malcolm | Actor | 1926 - 1930 | 3 | |
| Margulies, Pär | Pär Margulies | Actor | 1985 - 1989 | 3 | |
| Martin, Gundula | Gundula Martin | Costume Designer, Designer | 1987 | 3 | |
| Martin, Klaus, | Klaus Martin | Actor, Lighting Designer, Sound Designer | 1986 | 3 | |
| Maslon, Laurence | Laurence Maslon | Dramaturg | 1985 - 1995 | 3 | |
| Mason, Dan, | Dan Mason | Actor | 1996 - 2013 | 3 | |
| Matveeva, Svetlana | Svetlana Matveeva | Actor, Costume Designer, Designer | 2001 | 3 | |
| Matysová, Milada | Milada Matysová | Actor | 1939 | 3 | |
| Matz, Katharina | Katharina Matz | Actor | 1956 | 3 | |
| Mavromataki, Kelly | Kelly Mavromataki | Costume Designer | 2006 - 2007 | 3 | |
| McCallum, Paul | Paul McCallum | Actor | 1970 | 3 | |
| McCoy, Michael | Michael McCoy | Sound Designer | 1992 | 3 | |
| McHallem, Christopher | Christopher McHallem | Actor | 1992 | 3 | |
| McRae, Hilton | Hilton McRae | Actor | 1993 - 2003 | 3 | |
| Medina, Estela, | Estela Medina | Actor | 1954 | 3 | |
| Mehring, Horst | Horst Mehring | Actor | 1971 | 3 | |
| Melldahl, Åsa | Åsa Melldahl | Director | 2000 - 2008 | 3 | |
| Mellor, Harold | Harold Mellor | Actor | 1963 - 1977 | 3 | |
| Metcalfe, Edgar | Edgar Metcalfe | Director | 1970 | 3 | |
| Meunier, Enny | Enny Meunier | Actor | 1955 | 3 | |
| Meyer, Wilhelm, | Wilhelm Meyer | Actor | 1976 | 3 | |
| Mezzanotte, Luigi, | Luigi Mezzanotte | Actor | 1975 - 1993 | 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 | |
| Mochizuki, Michiharu | Michiharu Mochizuki | Actor | 1983 - 1994 | 3 | |
| Modén, Mirja | Mirja Modén | Actor | 1989 - 1990 | 3 | |
| Mooney, Ria, | Ria Mooney | Actor | 1923 - 1925 | 3 | |
| Moore, Mary | Mary Moore | Costume Designer, Designer | 1989 - 1990 | 3 | |
| Morelli, Richard | Richard Morelli | Director | 1949 - 1959 | 3 | |
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