| Mortimer, Charles | Charles Mortimer | Actor | 1928 | 1 | |
| Moore, Mabel | Mabel Moore | Actor | 1927 - 1937 | 3 | |
| Macgill, Moyna | Moyna Macgill | Actor | 1928 | 1 | |
| McDonald, Katherine | Katherine McDonald | Actor | 1928 | 1 | |
| Moon, Franklin | Franklin Moon | Actor | 1928 | 1 | |
| Membrives, Lola | Lola Membrives | Actor | 1928 - 1929 | 9 | |
| Murphy, John Daly | John Daly Murphy | Actor | 1900 - 1929 | 5 | |
| Melnalksnis, Augusts | Augusts Melnalksnis | Translator | 1929 - 1956 | 2 | |
| Monroe, Frank | Frank Monroe | Actor | 1928 - 1929 | 3 | |
| Metaxa, M. | M. Metaxa | Actor | 1929 | 1 | |
| Mieze, Elīzabete | Elīzabete Mieze | Actor | 1929 | 1 | |
| Meličková, Hanča | Hanča Meličková | Actor | 1929 | 1 | |
| Malimánek, Hanuš | Hanuš Malimánek | Actor | 1929 | 1 | |
| Marchant, Philip | Philip Marchant | Actor | 1970 | 1 | |
| Matthews, Ann-Sara | Ann-Sara Matthews | Actor | 1979 | 1 | |
| Martell, Gillian | Gillian Martell | Actor | 1970 | 1 | |
| Moffatt, John | John Moffatt | Actor | 1970 | 2 | |
| McCarthy, Julia | Julia McCarthy | Actor | 1958 - 1970 | 3 | |
| Mirsky, Laura | Laura Mirsky | Actor | 1979 | 1 | |
| Macy, William, Hall | William Hall Macy | Actor | 1979 | 1 | |
| McCallum, Douglas | Douglas McCallum | Actor | 1975 | 1 | |
| Michell, Camille | Camille Mitchell | Actor | 1975 | 1 | |
| Mørk, Erik | Erik Mørk | Actor | 1951 - 2004 | 15 | |
| 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 | |
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