| March, Molly | Molly March | Designer | 1975 | 1 | |
| McMillen, Jesse | Jesse McMillen | Actor | 1978 | 1 | |
| McMillen, Bev | Bev McMillen | Actor | 1978 | 1 | |
| McMillen, Virginia | Virginia McMillen | Actor | 1978 | 1 | |
| Mayer, Michaela | Michaela Mayer | Costume Designer | 1978 - 1989 | 3 | |
| McGregor, Angela Punch | Angela Punch McGregor | Actor | 1974 | 1 | |
| Menéndez, Ramón | Ramón Menéndez | Actor | 1974 | 1 | |
| Major, J. | J. Major | Actor | 1911 | 1 | |
| Malinova, L. | L. Malinova | Actor | 1911 | 1 | |
| Meek, Muriel | Muriel Meek | Actor | 1911 | 1 | |
| Mack, Muriel | Muriel Mack | Actor | 1911 | 1 | |
| Mroczkowska, Helena | Helena Mroczkowska | Actor | 1911 | 1 | |
| Matthies, Eberhard | Eberhard Matthies | Costume Designer, Designer | 1974 - 1999 | 6 | |
| Maneva, Zvetana | Zvetana Maneva | Actor | 1974 - 1994 | 6 | |
| Mindov, Stojan | Stojan Mindov | Actor | 1974 - 1994 | 5 | |
| Maxe, Göthe, Valter | Göthe Valter Maxe (Goethe Maxe) | Actor | 1970 - 1990 | 2 | |
| Meyer, Torben | Torben Meyer | Actor | 1911 | 1 | |
| Mehrn, Laura | Laura Mehrn | Actor | 1911 | 1 | |
| Mihelsons, Arveds | Arveds Mihelsons | Actor | 1912 | 1 | |
| Mardžanov, Konstantin | Konstantin Mardžanov | Director | 1912 | 1 | |
| Mason, Margery | Margery Mason | Actor | 1973 | 1 | |
| Mooney, Robert | Robert Mooney | Actor | 1974 | 1 | |
| Maynard, Anita | Anita Maynard | Actor | 1974 - 1977 | 3 | |
| Meyers, Patrick | Patrick Meyers | Actor | 1974 | 1 | |
| Moses, Thomas G. | Thomas G. Moses | Actor | 1974 | 1 | |
| Makarska, Teresa | Teresa Makarska | Actor | 1973 | 1 | |
| Morgan, Robert | Robert Morgan | Costume Designer | 1974 - 1979 | 3 | |
| Mårtensson, Lillemor | Lillemor Mårtensson | Actor | 1974 - 1975 | 2 | |
| Magee, Patrick | Patrick Magee | Actor | 1959 - 1974 | 3 | |
| McArdle, Nicholas | Nicholas McArdle | Actor | 1974 | 1 | |
| Mari, Roberto | Roberto Mari | Actor | 1974 | 3 | |
| Mari, Franco | Franco Mari | Actor | 1974 | 3 | |
| Maniscalco, Gioacchino | Gioacchino Maniscalco | Actor | 1974 | 3 | |
| Magris, Claudio | Claudio Magris | Translator | 1974 - 2020 | 16 | |
| Mark, E. V. | E. V. Mark | Actor | 1912 | 1 | |
| Modzelewski, Józefa | Józefa Modzelewski | Actor | 1912 | 1 | |
| Miłaszewska, Wanda | Wanda Miłaszewska | Actor | 1912 | 2 | |
| Matz, Ingeborg | Ingeborg Matz | Actor | 1970 | 2 | |
| Masuth, Leo | Leo Masuth | Actor | 1970 | 2 | |
| Matoušek, František | František Matoušek | Actor | 1974 | 1 | |
| Mancioppi, Alberto | Alberto Mancioppi | Actor | 1974 - 1975 | 6 | |
| Menegatti, Beppe | Beppe Menegatti | Director | 1974 - 2007 | 7 | |
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