| Mowlam, Carole | Carole Mowlam | Actor | 1962 | 2 | |
| Menskau, Frank | Frank Menskau | Lighting Designer | 1961 - 1962 | 2 | |
| Mercedes, Nita | Nita Mercedes | Actor | 1961 | 2 | |
| McDermott, John | John McDermott | Designer | 2011 - 2022 | 2 | |
| Miles, Bernard | Bernard Miles | Actor, Designer | 1933 - 1961 | 2 | |
| Morris, Anthea | Anthea Morris | Actor | 1961 | 2 | |
| Meyer, Hanna | Hanna Meyer | Actor | 1954 - 1961 | 2 | |
| McGuire, Michael | Michael McGuire | Actor | 1961 - 1962 | 2 | |
| McBride, Betsy | Betsy McBride | Actor | 2012 | 2 | |
| Mroch, Mike | Mike Mroch | Designer | 2011 - 2014 | 2 | |
| Messner, Franz | Franz Messner | Actor | 1960 | 2 | |
| Mayanglambam, Mangka | Mangka Mayanglambam | Actor | 2012 | 2 | |
| Marcopol, Athena | Athena Marcopol | Actor | 1944 - 1945 | 2 | |
| Mălureanu, Florica | Florica Mălureanu | Costume Designer, Designer | 1976 | 2 | |
| Micalgic, Goran | Goran Micalgic | Actor | 2012 | 2 | |
| Mahoney, Caitlin | Caitlin Mahoney | Actor | 2011 - 2013 | 2 | |
| Mascaro, Marcel | Marcel Mascaro | Actor | 2011 - 2013 | 2 | |
| Mänttäri, Jyrki | Jyrki Mänttäri | Actor | 2011 - 2012 | 2 | |
| Mateescu, Mia | Mia Mateescu | Actor | 1935 - 1937 | 2 | |
| Marcovici, Carol | Carol Marcovici | Actor | 1972 | 2 | |
| Muscan, Zoe | Zoe Muscan | Actor | 1973 - 1988 | 2 | |
| Mosselmans, Aymeric | Aymeric Mosselmans | Actor | 2011 | 2 | |
| Mărculescu, Domniţa | Domniţa Mărculescu | Actor | 1968 - 1969 | 2 | |
| Marian, B. | B. Marian | Translator | 1901 | 2 | 1 |
| Mishra, Puneet Kumar | Puneet Kumar Mishra | Musician | 2016 - 2017 | 2 | |
| Malinauskaitė, Gabrielė | Gabrielė Malinauskaitė | Actor | 2011 | 2 | |
| Martin, Ben | Ben Martin | Actor | 2011 - 2012 | 2 | |
| Murphy, Conor | Conor Murphy | Actor | 2013 - 2023 | 2 | |
| March, Rosalind | Rosalind March | Actor | 1977 - 2013 | 2 | 1 |
| Mureşan, Arhidiade | Arhidiade Mureşan | Costume Designer, Designer | 2009 | 2 | |
| Marinca, Gheorghe | Gheorghe Marinca | Actor, Musical Director | 1968 | 2 | |
| Moss, Robert | Robert Moss | Actor, Director | 1952 - 2013 | 2 | |
| Marley, John | John Marley | Actor | 1950 - 1959 | 2 | |
| McGoohan, Patrick | Patrick McGoohan | Actor | 1959 | 2 | 1 |
| McFarland, Olive | Olive McFarland | Actor | 1959 | 2 | 1 |
| Malmberg, Barbro | Barbro Malmberg | Actor | 1959 | 2 | |
| Matthiesen, Marc | Marc Matthiesen | Adaptation, Dramaturg | 2013 | 2 | |
| Moir, Alec | Alec Moir | Actor | 1957 | 2 | |
| Morton, Clive | Clive Morton | Actor | 1957 - 1958 | 2 | 1 |
| Moe, Ove | Ove Moe | Actor | 1953 - 1956 | 2 | 1 |
| Maurer, Christian | Christian Maurer | Actor, Director | 1960 | 2 | |
| Muller, Rosemarie | Rosemarie Muller | Actor | 1960 - 1975 | 2 | |
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