| Mascus, Hella-Birgit | Hella-Birgit Mascus (Hella-Birgit Mascus) | Actor | 1989 - 1990 | 2 | |
| Matela, Kimberly | Kimberly Matela (Kimberly Matela) | Costume Designer | 2006 | 2 | |
| Matikainen, Osmo | Osmo Matikainen (Osmo Matikainen) | Actor | 1983 - 2006 | 2 | |
| Matsui, Sumako | Sumako Matsui (Sumako Matsui) | Actor | 1914 | 2 | |
| Matsumoto, Kappei | Kappei Matsumoto (Kappei Matsumoto) | Actor | 1934 - 1978 | 2 | |
| Matthias, Peter | Peter Matthias (Peter Matthias) | Actor | 1975 - 1992 | 2 | |
| Mátyás, Jolán | Jolán Mátyás (Jolán Mátyás) | Actor | 1965 - 1969 | 2 | |
| Matzkanin, Mark | Mark Matzkanin (Mark Matzkanin) | Lighting Designer | 1990 - 2007 | 2 | |
| Mauhs, Else | Else Mauhs (Else Mauhs) | Actor | 1925 - 1928 | 2 | |
| May, Eberhard | Eberhard May (Eberhard May) | Actor | 1975 - 1997 | 2 | |
| McCarthy, Eoin | Eoin McCarthy (Eoin McCarthy) | Actor | 2000 - 2003 | 2 | |
| McCracken, Everett | Everett McCracken (Everett McCracken) | Composer | 1928 | 2 | |
| McMahon, Charles | Charles McMahon (Charles McMahon) | Actor, Director | 1999 - 2005 | 2 | |
| McSweeney, Kevin | Kevin McSweeney (Kevin McSweeney) | Director | 2001 | 2 | |
| McWilliams, Jack | Jack McWilliams (Jack McWilliams) | Actor | 1928 | 2 | |
| Meeker, Dan | Dan Meeker (Dan Meeker) | Designer, Lighting Designer | 2003 | 2 | |
| Meister, Karel | Karel Meister (Karel Meister) | Actor | 1961 - 1966 | 2 | |
| Melchert, Arne | Arne Melchert (Arne Melchert) | Actor | 1924 - 1944 | 2 | |
| Mendes, Manuel | Manuel Mendes (Manuel Mendes) | Actor | 1993 - 2004 | 2 | |
| Meshulach, Rivka | Rivka Meshulach (Rivka Meshulach) | Translator | 1999 - 2000 | 2 | |
| Mian, Daniel | Daniel Mian (Daniel Mian) | Actor | 2004 - 2012 | 2 | |
| Michael, Pierre | Pierre Michael (Pierre Michael) | Actor | 1976 - 1980 | 2 | |
| Michaelis, Ruscha | Ruscha Michaelis (Ruscha Michaelis) | Actor | 1897 - 1898 | 2 | |
| Migliardi, Mario | Mario Migliardi (Mario Migliardi) | Composer | 1974 | 2 | |
| Mihai, Mihaela | Mihaela Mihai (Mihaela Mihai) | Actor | 2006 | 2 | |
| Miiros, Annika | Annika Miiros (Annika Miiros) | Actor | 1980 - 1986 | 2 | |
| Militaru, Sorin | Sorin Militaru (Sorin Militaru) | Director | 2006 | 2 | |
| Minguell, Josep | Josep Minguell (Josep Minguell) | Actor | 1988 - 1997 | 2 | |
| Mirnik, Cveta | Cveta Mirnik (Cveta Mirnik) | Costume Designer | 1979 - 1986 | 2 | |
| Modrzejewska, Helena | Helena Modrzejewska (Helena Modrzejewska) | Actor | 1882 - 1885 | 2 | 1 |
| Moe, Stig-Werner | Stig-Werner Moe (Stig-Werner Moe) | Actor | 1992 - 1996 | 2 | |
| Mohamed, Makbul | Makbul Mohamed (Makbul Mohamed) | Actor | 2005 - 2006 | 2 | |
| Mohr, Betty | Betty Mohr (Betty Mohr) | Actor | 1934 - 1935 | 2 | |
| Molander, Gustaf | Gustaf Molander (Gustaf Molander) | Actor | 1921 - 1925 | 2 | |
| Moldovan, Dorothea | Dorothea Moldovan (Dorothea Moldovan) | Actor | 2006 | 2 | |
| Monaci, Aldo | Aldo Monaci (Aldo Monaci) | Actor | 1955 - 1956 | 2 | |
| Monaci, Berto | Berto Monaci (Berto Monaci) | Actor | 1955 - 1956 | 2 | |
| Montagna, Carlo | Carlo Montagna (Carlo Montagna) | Actor | 1974 | 2 | |
| Moore, John | John Moore (John Moore) | Actor | 1957 - 1962 | 2 | |
| Moreno, Mireya | Mireya Moreno (Mireya Moreno) | Actor | 2006 - 2011 | 2 | |
| Morgen, Gisela | Gisela Morgen (Gisela Morgen) | Actor | 1951 - 1964 | 2 | |
| Morgenstern, Holger | Holger Morgenstern (Holger Morgenstern) | Actor | 1995 | 2 | |
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