| Mallickjoly, Wahida | Wahida Mallickjoly | Costume Designer | 1998 | 1 | |
| Michels, Hans Herbert | Hans Herbert Michels | Actor | 1934 - 1958 | 2 | |
| Makedonskij, K. | K. Makedonskij | Actor | 1938 | 1 | |
| Malachova, Z. | Z. Malachova | Actor | 1938 | 1 | |
| Mabusenko, V. | V. Mabusenko | Designer | 1999 - 2000 | 2 | |
| Musina, O. | O. Musina | Actor | 1999 - 2000 | 2 | |
| Markworth, Trevor | Trevor Markworth | Actor | 2000 - 2002 | 2 | |
| Merckel, Nola | Nola Merckel | Actor | 2002 | 1 | |
| Mowrey, Terri | Terri Mowrey | Actor | 2007 | 1 | |
| Malých, Mrs. | Mrs. Malých | Actor | 1904 | 1 | |
| Magazzari, Ms. | Ms. Magazzari | Actor | 1891 - 1892 | 3 | |
| Mazzanti, Ettore | Ettore Mazzanti | Actor | 1891 - 1907 | 21 | |
| Marien, Pierre | Pierre Marien | Actor | 1984 | 1 | |
| Malmierca, Álvaro | Álvaro Malmierca | Adaptation, Translator | 1999 | 2 | |
| Mazzarelli, - | - Mazzarelli | Actor | 1999 | 1 | |
| McDonald, Frank | Frank McDonald | Actor | 1971 - 1985 | 4 | |
| Michałowski, Janusz | Janusz Michałowski | Actor | 1994 | 2 | |
| Masek, Vaclav | Vaclav Masek | Actor | 1924 | 1 | |
| Mlakar, Dušan | Dušan Mlakar | Adaptation, Director | 1979 - 2012 | 9 | |
| Matul, Niko | Niko Matul | Designer | 1979 | 1 | |
| Myrkou, Tatiana | Tatiana Myrkou | Choreographer | 2008 | 1 | |
| Moreau-Lepine, Blanche | Blanche Moreau-Lepine | Actor | 1995 | 1 | |
| Monaci, Maria Grazia | Maria Grazia Monaci | Actor | 1955 - 1956 | 2 | |
| Motley, - | - Motley | Costume Designer, Designer | 1936 - 1961 | 34 | |
| McCormick, F.J. | F. J. McCormick (F.J. McCormick) | Actor | 1923 - 1929 | 5 | |
| MacAnna, Fiona | Fiona MacAnna | Actor | 1982 | 1 | |
| Meyerbeer, - | - Meyerbeer | Composer | 1892 | 1 | |
| Mascagni, - | - Mascagni | Composer | 1892 | 1 | |
| Michiels, - | - Michiels | Composer | 1892 | 1 | |
| Maraval, - | - Maraval | Actor | 1921 - 1926 | 3 | |
| Mendizabal, Nelly | Nelly Mendizabal | Actor | 1954 - 1955 | 2 | |
| Merten, Thorsten | Thorsten Merten | Actor | 1994 - 1998 | 10 | |
| Milan, Fred | Fred Milan | Choreographer | 1977 | 1 | |
| Martin, Thomas | Thomas Martin | Actor | 1953 - 1992 | 2 | |
| Mickelsen, David Kay | David Kay Mickelsen | Costume Designer | 2005 | 1 | |
| Mercurio, Maria Giovanna | Maria Giovanna Mercurio | Costume Designer | 1993 - 1994 | 2 | |
| Ming-chu, Maggie Shum | Maggie Shum Ming-chu | Composer | 2001 | 1 | |
| Murray, Nan | Nan Murray | Actor | 1916 | 1 | |
| Meyer, - | - Meyer | Actor | 1877 - 1901 | 5 | |
| Müller, - | - Müller | Actor | 1903 - 1918 | 4 | |
| Marchant, Nicolas | Nicolas Marchant | Designer | 2002 | 1 | |
| Mogendorf, Thomas | Thomas Mogendorf | Costume Designer, Designer | 1983 - 2006 | 16 | |
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