| Müller-Reitzner, Kurt | Kurt Müller-Reitzner | Actor | 1971 - 1983 | 5 | |
| Malone, Sharon | Sharon Malone | Costume Designer | 1972 | 1 | |
| Maier, Ellen | Ellen Maier | Actor | 1972 | 1 | |
| Muller, Franz | Franz Muller | Actor | 1899 | 1 | |
| Muller, - | - Muller | Actor | 1899 | 1 | |
| Martinsons, Anatols | Anatols Martinsons | Actor | 1975 | 1 | |
| Muceniece, Ilga | Ilga Muceniece | Actor | 1964 - 1975 | 2 | |
| Mason, Marshall W. | Marshall W. Mason | Director, Lighting Designer | 1964 - 1973 | 2 | |
| Mertinz, Johanna | Johanna Mertinz | Actor | 1975 | 1 | |
| Müller, Hans-Reinhard | Hans-Reinhard Müller | Actor, Director | 1975 - 1979 | 3 | |
| Madden, Sharon | Sharon Madden | Actor | 1973 | 1 | |
| Miller, Carol | Carol Miller | Actor | 1976 - 1977 | 2 | |
| Muhr, Michael | Michael Muhr | Adaptation, Translator | 1975 - 2009 | 7 | |
| Mebus, Eduard | Eduard Mebus | Actor | 1900 | 1 | |
| Matisová, Gita | Gita Matisová | Costume Designer | 1973 | 1 | |
| Maurer, Marie, von | Marie von Maurer | Actor | 1900 - 1912 | 4 | |
| Mies, Lisa | Lisa Mies | Actor | 2014 | 1 | |
| Müller-Elmau, Alexander | Alexander Müller-Elmau | Designer | 2014 | 1 | |
| Matousch, Stefan | Stefan Matousch | Actor | 2006 - 2015 | 3 | |
| Müller, Luitpold | Luitpold Müller | Actor | 1981 | 1 | |
| Mohr, Bernd | Bernd Mohr | Actor | 1979 | 1 | |
| Machoninová, Lenka | Lenka Machoninová | Actor | 1973 | 1 | |
| Mesch, Marie | Marie Mesch | Actor | 1889 | 1 | |
| Massara, Pino | Pino Massara | Composer | 1975 - 1976 | 3 | |
| Meyer, Donna | Donna Meyer | Costume Designer | 1975 | 1 | |
| Marcussen, Michael | Michael Marcussen | Actor | 1980 | 1 | |
| Marowitz, Charles | Charles Marowitz | Adaptation, Director | 1978 - 1990 | 12 | |
| Modica, Dolores | Dolores Modica | Actor | 1979 | 1 | |
| Modica, Juliette | Juliette Modica | Actor | 1979 | 1 | |
| Moody, James | James Moody | Actor | 1979 | 1 | |
| Mauthe, Florian | Florian Mauthe | Actor | 1975 | 1 | |
| Medwed, Silva | Silva Medwed | Actor | 1970 - 1975 | 2 | |
| Mauren, Otto | Otto Mauren | Actor | 1900 | 1 | |
| Marquardt, Lotte | Lotte Marquardt | Actor | 1976 - 1993 | 5 | |
| Meter, Jeremy, van | Jeremy van Meter | Actor | 2012 - 2014 | 9 | |
| Mayer, Kit | Kit Mayer | Designer, Lighting Designer | 2006 - 2014 | 10 | |
| McCardle, Dillon | Dillon McCardle | Sound Designer | 2014 | 1 | |
| Minora, Lee | Lee Minora | Actor | 2014 | 2 | |
| Monteiro, Luís, de Sttau | Luís de Sttau Monteiro | Adaptation, Director, Translator | 1972 | 3 | |
| Maria, Guida | Guida Maria | Actor | 1972 | 1 | |
| Mota, Cândido | Cândido Mota | Actor | 1972 | 1 | |
| Miller, Jan | Jan Miller | Actor | 1973 | 1 | |
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