| Modschiedler, M. | M. Modschiedler | Actor | 1982 | 2 | |
| Martinos, Giorgos | Giorgos Martinos | Assistant Director | 2014 - 2015 | 2 | |
| Matull, Oskar | Oskar Matull | Actor | 1980 - 1997 | 2 | |
| Midgley, Robin | Robin Midgley | Director | 1969 - 1980 | 2 | 1 |
| McKeown, Fintan | Fintan McKeown | Actor | 1980 - 2010 | 2 | |
| Morick, Jeanine | Jeanine Morick | Actor | 1980 | 2 | |
| Marshall, William, Horace | William Horace Marshall | Actor | 1980 | 2 | 1 |
| Mink, David | David Mink | Actor | 1980 | 2 | |
| Moore, Andrew | Andrew Moore | Actor | 1980 | 2 | |
| Mosher, Gregory | Gregory Mosher | Director | 1980 | 2 | 1 |
| Mantle, Doreen | Doreen Mantle | Actor | 1975 - 2011 | 2 | 1 |
| Morrison, Conall | Conall Morrison | Director | 2000 - 2003 | 2 | 1 |
| McIntyre, Colin | Colin McIntyre | Director | 1969 - 1980 | 2 | |
| Molinari, Renata | Renata Molinari | Adaptation | 1994 - 1996 | 2 | |
| Moretti, Maria | Maria Moretti | Actor | 1994 | 2 | |
| Maurina, Franco | Franco Maurina | Composer | 1994 | 2 | |
| McCall, Nick | Nick McCall | Lighting Designer | 1993 - 1994 | 2 | |
| Minegishi, Shintaro | Shintaro Minegishi | Actor | 1992 - 1994 | 2 | |
| Mori, Ryu | Ryu Mori | Adaptation, Director | 1994 | 2 | |
| Meyer, Doris | Doris Meyer | Actor | 1962 - 1997 | 2 | |
| McKereghan, Dan | Dan McKereghan | Adaptation, Director | 1997 | 2 | 1 |
| Mäkinen, Veikko | Veikko Mäkinen | Designer | 1966 - 1980 | 2 | |
| Murphy, Rosemary | Rosemary Murphy | Actor | 1980 - 1999 | 2 | 1 |
| Matthus, Frank | Frank Matthus | Director | 1996 - 1998 | 2 | |
| Mattson, Kalle | Kalle Mattson | Actor, Musician | 1996 | 2 | 1 |
| Moign, Chantal le | Chantal Le Moign | Actor | 1995 - 2006 | 2 | 1 |
| McIntosh, Duncan | Duncan McIntosh | Director | 1989 - 1996 | 2 | 1 |
| Miller, J. G. | J. G. Miller | Costume Designer, Designer | 1980 | 2 | |
| Martignoni, Werner | Werner Martignoni | Translator | 1993 - 1996 | 2 | 1 |
| Mitra, Tushar | Tushar Mitra | Lighting Designer | 1996 - 1999 | 2 | |
| Markusson, Robert | Robert Markusson | Actor | 1997 | 2 | |
| Mobers, Christine | Christine Mobers | Costume Designer, Designer | 1995 | 2 | |
| Matsumoto, Sakae | Sakae Matsumoto | Actor, Designer | 1996 | 2 | |
| Maßun, Monika | Monika Maßun | Actor | 1995 | 2 | |
| Mitchell, Adrian | Adrian Mitchell | Translator | 1994 - 1995 | 2 | 1 |
| Marcum, Quince | Quince Marcum | Actor | 1997 | 2 | |
| Mikulski, Stanisław | Stanisław Mikulski | Actor | 1969 | 2 | |
| Mattausch, Dietrich | Dietrich Mattausch | Actor | 2005 - 2006 | 2 | 1 |
| Malton, Leslie | Leslie Malton | Actor | 2005 - 2006 | 2 | 1 |
| Manso, Paula | Paula Manso | Actor | 1998 | 2 | |
| Mircea, Brânduşa | Brânduşa Mircea | Actor | 1997 - 1998 | 2 | |
| Mastalerz, Andrzej | Andrzej Mastalerz | Actor | 1998 - 2017 | 2 | |
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