| Makó, Aida | Aida Makó | Actor | 1924 | 1 | |
| Magnúsdóttir, Lara | Lara Magnúsdóttir | Actor | 1924 | 1 | |
| Mihalesco, Mr. | Mr. Mihalesco | Actor | 1925 - 1934 | 4 | |
| Millander, Sven | Sven Millander | Actor | 1925 | 1 | |
| Morley, Malcolm | Malcolm Morley | Actor, Designer, Director | 1925 - 1933 | 10 | |
| Medved, Cirila | Cirila Medved | Actor | 1925 | 1 | |
| Márkus, László | László Márkus | Designer, Director, Translator | 1925 - 1948 | 3 | |
| Mágori, Mária | Mária Mágori | Actor | 1924 - 1943 | 53 | |
| Machat, Sidney | Sidney Machat | Actor | 1925 - 1926 | 3 | |
| Mindell, Fania | Fania Mindell | Costume Designer | 1926 | 1 | |
| Mielziner, Jo | Jo Mielziner | Costume Designer, Designer | 1925 - 1932 | 5 | |
| Menken, Helen | Helen Menken | Actor | 1926 | 1 | |
| Mitchell, Mrs. | Mrs. Mitchell | Actor | 1926 | 1 | |
| Moulton, Harold | Harold Moulton | Actor | 1926 - 1929 | 3 | |
| Matthews, Ross | Ross Matthews | Actor | 1926 | 1 | |
| Morris, Ann | Ann Morris | Actor | 1926 | 1 | |
| McMahon, Gregan | Gregan McMahon | Actor, Producer | 1926 - 1933 | 4 | |
| Mezzanotte, A. | A. Mezzanotte | Actor | 1892 - 1894 | 8 | |
| Mugnaini, A. | A. Mugnaini | Actor | 1892 - 1894 | 8 | |
| Mula, Tom | Tom Mula | Actor | 1972 | 1 | |
| McNutt, Patterson | Patterson McNutt | Producer | 1926 - 1927 | 7 | |
| Masson, William C. | William C. Masson | Actor | 1926 - 1927 | 6 | |
| Miller, Antha | Antha Miller | Actor | 1927 | 1 | |
| Maloberti, Tiziana | Tiziana Maloberti | Actor | 1927 | 2 | |
| Martini, Rodolfo | Rodolfo Martini | Actor | 1927 | 2 | |
| Maneva, Petja | Petja Maneva | Actor | 1974 | 1 | |
| Metscheva, Liljana | Liljana Metscheva | Director | 1974 | 1 | |
| Mann, Martha | Martha Mann | Costume Designer, Designer | 1974 - 1978 | 2 | |
| Matĕjíček, Jiří | Jiří Matĕjíček | Dramaturg | 1973 | 1 | |
| Miskey, József | József Miskey | Actor, Director | 1927 - 1928 | 7 | |
| Mihályi, Mária | Mária Mihályi | Actor | 1927 - 1928 | 10 | |
| Mangår, Erling | Erling Mangår | Actor | 1928 | 1 | |
| Musäus, Peter | Peter Musäus | Actor | 1964 - 2015 | 3 | |
| Mason, Roger | Roger Mason | Actor | 1976 | 1 | |
| Matic, Hans | Hans Matic | Actor | 1973 - 1983 | 3 | |
| Müller-Kopp, Bert | Bert Müller-Kopp | Actor | 1973 | 1 | |
| Mönch, Peter | Peter Mönch | Actor | 1973 | 1 | |
| Meek, Barbara | Barbara Meek | Actor | 1975 - 1983 | 5 | |
| McGill, Bruce | Bruce McGill | Actor | 1975 | 4 | |
| Milichovská, Eva | Eva Milichovská | Designer | 1971 | 1 | |
| Mackley, Philip | Philip Mackley | Actor | 1976 | 1 | |
| Manet, Michelle | Michelle Manet | Actor | 1977 | 1 | |
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