| Mangel, Selma | Selma Mangel | Actor | 1922 - 1925 | 4 | |
| Miller, Huntington | Huntington Miller | Actor | 1940 | 4 | |
| Manolache, Ilinca | Ilinca Manolache | Actor | 2015 - 2016 | 4 | |
| Munna, Kazi Fazleh Elahi | Kazi Fazleh Elahi Munna | Actor | 2000 - 2001 | 4 | |
| Marić, Divna | Divna Marić | Actor | 2000 | 4 | |
| Mihaiu, Horaţiu | Horaţiu Mihaiu | Designer, Director | 2016 | 4 | |
| Municchi, Andrea | Andrea Municchi | Actor | 1977 | 4 | |
| McKeating, Cealach | Cealach McKeating | Assistant Director | 2017 | 4 | |
| Mårtensson, Klara | Klara Mårtensson | Actor | 2017 - 2020 | 4 | |
| Michaïlidis, Giorgos | Giorgos Michaïlidis | Composer, Director | 1984 - 1985 | 4 | |
| Muscan, Gr. | Gr. Muscan | Actor | 1920 - 1923 | 4 | |
| Miklósy, Margit | Margit Miklósy | Actor | 1925 - 1933 | 4 | |
| Mansvjetova, Lidija | Lidija Mansvjetova | Actor, Director | 1924 - 1941 | 4 | |
| Martín, María | María Martín | Actor, Adaptation | 1971 - 1972 | 4 | |
| Marlot, Harald | Harald Marlot | Actor, Lighting Designer | 2014 - 2015 | 4 | |
| Michelsen, Anna, | Anna Michelsen | Actor | 1880 - 1882 | 3 | |
| Mihályfi, Béla | Béla Mihályfi | Actor | 1928 - 1932 | 3 | |
| Manz, Andreas | Andreas Manz | Actor, Director | 2007 - 2009 | 3 | |
| Malcolm, Roy | Roy Malcolm | Actor | 1926 - 1930 | 3 | |
| Margulies, Pär | Pär Margulies | Actor | 1985 - 1990 | 3 | |
| Martin, Gundula | Gundula Martin | Costume Designer, Designer | 1987 - 2014 | 3 | |
| Martin, Klaus, | Klaus Martin | Actor, Lighting Designer, Sound Designer | 1986 - 1999 | 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 - 1954 | 3 | |
| 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 | |
| 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 | |
| Mellor, Harold | Harold Mellor | Actor | 1963 - 1977 | 3 | |
| Metcalfe, Edgar | Edgar Metcalfe | Director | 1970 | 3 | |
| Meunier, Enny | Enny Meunier | Actor | 1955 - 1977 | 3 | |
| Meyer, Wilhelm, | Wilhelm Meyer | Actor | 1976 - 1980 | 3 | |
| Mezzanotte, Luigi, | Luigi Mezzanotte | Actor | 1975 - 1993 | 3 | |
| Micińska, Magdalena, | Magdalena Micińska | Actor | 1882 - 1908 | 3 | |
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