| Möckel, Andreas | Andreas Möckel | Actor | 1990 - 2014 | 6 | |
| Manker, Katharina | Katharina Manker | Actor | 1988 | 6 | |
| Mejuto, Andrés | Andrés Mejuto | Actor | 1968 - 1982 | 6 | |
| Mortimer, Vicki | Vicki Mortimer | Designer | 1993 - 2010 | 6 | |
| Majewski, Maria | Maria Majewski | Actor | 1977 - 1982 | 6 | |
| Maglietta, Maria | Maria Maglietta | Actor, Costume Designer, Designer | 1994 - 1996 | 6 | |
| Mrkvička, Ladislav | Ladislav Mrkvička | Actor | 1994 - 2009 | 6 | |
| McPherson, Coco | Coco McPherson | Actor | 1989 - 1995 | 6 | |
| Markovics, Margit | Margit Markovics | Actor | 1908 - 1920 | 6 | |
| Morbello, Guido | Guido Morbello | Actor | 1996 | 6 | |
| Meister, Michael | Michael Meister | Actor | 1995 | 6 | |
| McEleney, Brian | Brian McEleney | Actor | 1998 | 6 | |
| Merki, Stefan | Stefan Merki | Actor | 1997 | 6 | |
| Mancebo, Nelson | Nelson Mancebo | Costume Designer, Designer | 1976 - 2001 | 6 | |
| Mester, Tibor | Tibor Mester | Actor | 1933 - 1941 | 6 | |
| Mildner, Heinrich | Heinrich Mildner | Actor | 1966 - 1967 | 6 | |
| Morawetz, G. | Gustav Morawetz | Actor | 1966 - 1967 | 6 | |
| Molnár, Levente | Levente Molnár | Actor | 2004 - 2008 | 6 | |
| Matos, Catarina | Catarina Matos | Actor | 2002 | 6 | |
| Manari, Veleria | Veleria Manari | Costume Designer, Designer | 2002 - 2003 | 6 | |
| Moschos, Dimitris | Dimitris Moschos | Actor | 2002 | 6 | |
| Martins, José | José Martins | Actor, Translator | 1997 - 1998 | 6 | |
| Moscholiou, Maria | Maria Moscholiou | Actor | 1961 - 1997 | 6 | |
| McInnerny, Tim | Tim McInnerny | Actor | 2003 - 2010 | 6 | |
| Mason, Chad | Chad Mason | Actor, Musical Director | 2001 | 6 | |
| Metzikof, Giannis | Giannis Metzikof | Costume Designer, Designer | 2003 - 2008 | 6 | |
| Masliah, Laurence | Laurence Masliah | Actor | 2003 | 6 | |
| Münch, Marion | Marion Münch | Costume Designer | 2003 - 2013 | 6 | |
| Metzen, Marlon | Marlon Metzen | Adaptation, Composer, Director | 2004 - 2006 | 6 | |
| McDevitt, Lorna | Lorna McDevitt | Actor | 2005 | 6 | |
| McCallum, Eileen | Eileen McCallum | Actor | 2005 | 6 | |
| Moltzen, Peter | Peter Moltzen | Actor | 2005 - 2007 | 6 | |
| Meyn, Tilman | Tilman Meyn | Actor | 2005 - 2007 | 6 | |
| Marston, Cathy | Cathy Marston | Adaptation, Choreographer | 2005 - 2008 | 6 | |
| Monthie, Jessica | Jessica Monthie | Actor | 2001 | 6 | |
| Morgenstern, Maia | Maia Morgenstern | Actor | 1985 | 6 | |
| Molina, Olivia | Olivia Molina | Actor | 2007 | 6 | |
| Miguel, Chema, de | Chema de Miguel | Actor | 2007 | 6 | |
| Maciá, Carlos | Carlos Maciá | Actor | 2006 - 2007 | 6 | |
| Maciá, Ximo | Ximo Maciá | Lighting Designer | 2006 - 2007 | 6 | |
| Michalakopoulos, Giorgos | Giorgos Michalakopoulos | Actor, Director | 1984 - 2008 | 6 | |
| Michailov, Mihaela | Mihaela Michailov | Dramaturg | 2015 - 2016 | 6 | |
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