| 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 | |
| Marković, Dimitrije | Dimitrije Marković | Actor | 1897 - 1907 | 4 | |
| Mehmedbašić, Zeina | Zeina Mehmedbašić | Translator | 1983 - 2011 | 4 | 1 |
| 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 | |
| Moukarzel, Ziad | Ziad Moukarzel | Musical Director | 2023 | 4 | |
| Macmillan, Duncan | Duncan Macmillan | Adaptation | 2023 | 4 | |
| Morita, Gô | Gô Morita (森田剛) | Actor | 2023 | 4 | |
| Miura, Touko | Touko Miura (三浦透子) | Actor | 2023 | 4 | |
| Marini, Giovanna | Giovanna Marini | Composer | 1980 | 4 | |
| Morandini, Luisa | Luisa Morandini | Actor, Adaptation, Director, Lighting Designer | 1987 | 4 | |
| Marziali, Alessandro | Alessandro Marziali | Designer, Lighting Designer | 2015 | 4 | |
| Massa, Ilenia | Ilenia Massa | Actor | 2013 | 4 | |
| Mattiusi, Teresa | Teresa Mattiusi | Actor | 2023 | 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 | 1 |
| Malcolm, Roy | Roy Malcolm | Actor | 1926 - 1930 | 3 | |
| Manasiev, Plamen | Plamen Manasiev (Пламен Манасиев) | Actor | 2001 - 2023 | 3 | |
| Margulies, Pär | Pär Margulies | Actor | 1985 - 1990 | 3 | 1 |
| 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 | 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 |
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