| Maniu, Adrian | Adrian Maniu | Translator | 1959 - 1994 | 4 | |
| Mann, Aaron | Aaron Mann | Actor | 2008 | 1 | |
| Mann, Emily | Emily Mann | Actor, Director | 1979 - 1996 | 4 | |
| Mann, Jack | Jack Mann | Sound Designer | 1982 | 1 | |
| Mannheimer, Bodil | Bodil Mannheimer | Actor | 1968 | 2 | |
| Manoledakis, Ioanna | Ioanna Manoledakis | Costume Designer, Designer | 1988 - 2006 | 16 | |
| Manoukian, Alina | Alina Manoukian | Actor | 2004 | 1 | |
| Mansos, Holly | Holly Mansos | Costume Designer | 2000 | 1 | |
| Mansourian, Henrik | Henrik Mansourian | Lighting Designer | 2007 | 1 | |
| Manthey, Simone | Simone Manthey | Designer | 1998 - 2016 | 5 | |
| Mantius, Karlheinz | Karlheinz Mantius | Actor | 1964 - 1973 | 2 | |
| Maranzana, Mario | Mario Maranzana | Actor, Director | 1974 - 1998 | 8 | |
| Marcello-Chraszczewska, Helena | Helena Marcello-Chraszczewska | Actor | 1882 | 1 | |
| Marchant, Jules-Henri | Jules-Henri Marchant | Director | 2002 | 1 | |
| Marchant, Valérie | Valérie Marchant | Actor | 2002 | 1 | |
| Marchioni, Vinicio | Vinicio Marchioni | Actor | 2002 - 2005 | 16 | |
| Marciniakówna, Anna | Anna Marciniakówna | Translator | 2006 - 2021 | 35 | |
| Marcks, Albrecht | Albrecht Marcks | Director | 1876 - 1890 | 5 | |
| Margenat, Beatriz | Beatriz Margenat | Choreographer | 1984 | 1 | |
| Margulies, Pär | Pär Margulies | Actor | 1985 - 1990 | 3 | |
| Marin, Hans | Hans Marin | Actor | 1973 - 1988 | 2 | |
| Marini, Giuseppe | Giuseppe Marini | Actor, Adaptation, Director | 1994 - 2023 | 50 | |
| Mark, Jan | Jan Mark | Adaptation, Dramaturg | 2002 - 2005 | 6 | |
| Marker, Alex | Alex Marker | Designer | 2004 | 1 | |
| Marker, Lise-Lone | Lise-Lone Marker | Translator | 1972 - 2018 | 15 | |
| Markham, Petra | Petra Markham | Actor | 2004 - 2016 | 8 | |
| Markkanen, Soili | Soili Markkanen | Actor | 1967 - 2012 | 4 | |
| Marko-Nord, Julia | Julia Marko-Nord | Actor | 2007 | 1 | |
| Marlatt, Richard | Richard Marlatt | Actor | 1999 | 1 | |
| Marlowe, Dorine | Dorine Marlowe | Actor | 1934 | 1 | |
| Marner, Carmela | Carmela Marner | Actor | 2006 | 1 | |
| Maron, Hanna | Hanna Maron | Actor | 1959 - 1966 | 2 | |
| Marr, Stacy | Stacy Marr | Actor | 2001 | 1 | |
| Marsh, Elliott | Elliott Marsh | Lighting Designer | 2008 | 1 | |
| Marshall, Stuart | Stuart Marshall | Designer | 2000 | 1 | |
| Martin, Adam | Adam Martin | Actor | 1975 | 1 | |
| Martin, Bob | Bob Martin | Lighting Designer, Sound Designer | 1990 | 2 | |
| Martin, Gundula | Gundula Martin | Costume Designer, Designer | 1987 - 2014 | 3 | |
| Martin, Harald | Harald Martin | Designer | 1954 - 1973 | 8 | |
| Martin, Klaus | Klaus Martin | Actor, Lighting Designer, Sound Designer | 1986 - 1999 | 3 | |
| Martin, Mooch | Mooch Martin | Costume Designer | 1990 | 1 | |
| Martinig, Aldo | Aldo Martinig | Composer | 1984 | 1 | |
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