| Miller, Huntington | Huntington Miller | Actor | 1940 | 4 | |
| Manolache, Ilinca | Ilinca Manolache | Actor | 2015 - 2016 | 4 | |
| Markham, David | David Markham | Actor | 1945 - 1961 | 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 | |
| Méndez Herrera, José | José Méndez Herrera | Translator | 1971 - 1978 | 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 | |
| Martín, María | María Martín | Actor, Adaptation | 1971 - 1972 | 4 | |
| Marlot, Harald | Harald Marlot | Actor, Lighting Designer | 2014 - 2015 | 4 | |
| Mae, Amy | Amy Mae | Lighting Designer | 2022 | 4 | |
| Michelsen, Anna | Anna Michelsen (Anna Michelsen) | Actor | 1880 - 1882 | 3 | |
| Mihályfi, Béla | Béla Mihályfi (Béla Mihályfi) | Actor | 1928 - 1932 | 3 | |
| Manz, Andreas | Andreas Manz (Andreas Manz) | Actor, Director | 2007 - 2009 | 3 | |
| Malcolm, Roy | Roy Malcolm (Roy Malcolm) | Actor | 1926 - 1930 | 3 | |
| Margulies, Pär | Pär Margulies (Pär Margulies) | Actor | 1985 - 1990 | 3 | |
| Martin, Gundula | Gundula Martin (Gundula Martin) | Costume Designer, Designer | 1987 - 2014 | 3 | |
| Martin, Klaus | Klaus Martin (Klaus Martin) | Actor, Lighting Designer, Sound Designer | 1986 - 1999 | 3 | |
| Maslon, Laurence | Laurence Maslon (Laurence Maslon) | Dramaturg | 1985 - 1995 | 3 | |
| Mason, Dan | Dan Mason (Dan Mason) | Actor | 1996 - 2013 | 3 | |
| Matveeva, Svetlana | Svetlana Matveeva (Svetlana Matveeva) | Actor, Costume Designer, Designer | 2001 | 3 | |
| Matysová, Milada | Milada Matysová (Milada Matysová) | Actor | 1939 - 1954 | 3 | |
| Matz, Katharina | Katharina Matz (Katharina Matz) | Actor | 1956 - 1985 | 3 | |
| Mavromataki, Kelly | Kelly Mavromataki (Kelly Mavromataki) | Costume Designer | 2006 | 3 | |
| McCallum, Paul | Paul McCallum (Paul McCallum) | Actor | 1970 | 3 | |
| McCoy, Michael | Michael McCoy (Michael McCoy) | Sound Designer | 1992 | 3 | |
| McHallem, Christopher | Christopher McHallem (Christopher McHallem) | Actor | 1992 | 3 | |
| McRae, Hilton | Hilton McRae (Hilton McRae) | Actor | 1993 - 2003 | 3 | |
| McTeer, Janet | Janet McTeer (Janet McTeer) | Actor | 1996 - 1997 | 3 | 2 |
| Medina, Estela | Estela Medina (Estela Medina) | Actor | 1954 - 1979 | 3 | |
| Mehring, Horst | Horst Mehring (Horst Mehring) | Actor | 1971 - 1975 | 3 | |
| Mehrjui, Dariush | Dariush Mehrjui (Dariush Mehrjui) | Director, Producer | 1993 - 2014 | 3 | |
| Melldahl, Åsa | Åsa Melldahl (Åsa Melldahl) | Director | 2000 - 2007 | 3 | |
| Mellor, Harold | Harold Mellor (Harold Mellor) | Actor | 1963 - 1977 | 3 | |
| Metcalfe, Edgar | Edgar Metcalfe (Edgar Metcalfe) | Director | 1970 | 3 | |
| Meunier, Enny | Enny Meunier (Enny Meunier) | Actor | 1955 - 1977 | 3 | |
| Meyer, Wilhelm | Wilhelm Meyer (Wilhelm Meyer) | Actor | 1976 - 1980 | 3 | |
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