| Massou, Khalid | Khalid Massou | Actor | 2008 | 6 | |
| Maxim, Cosmin | Cosmin Maxim | Actor | 2014 - 2018 | 6 | |
| Mercier, Annie | Annie Mercier | Actor | 2009 - 2010 | 6 | |
| Martinelli, Jean-Louis | Jean-Louis Martinelli | Director, Translator | 2010 - 2012 | 6 | |
| MacNeil, Ian | Ian MacNeil | Designer | 1986 - 2016 | 6 | 1 |
| Morahan, Hattie | Hattie Morahan | Actor | 2012 - 2023 | 6 | 3 |
| Moretti, Tobias | Tobias Moretti | Actor | 1985 - 1986 | 6 | |
| Maertens, Peter | Peter Maertens | Actor, Director | 1966 - 1994 | 6 | |
| Monttola, Adriane | Adriane Monttola | Actor | 1987 | 6 | |
| Meredith, David, Lloyd | David Lloyd Meredith | Actor | 1991 | 6 | |
| Morgan, Matthew | Matthew Morgan | Actor | 1991 | 6 | |
| Möckel, Andreas | Andreas Möckel | Actor | 1990 - 2014 | 6 | |
| Manker, Katharina | Katharina Manker | Actor | 1988 | 6 | |
| Mejuto, Andrés | Andrés Mejuto | Actor | 1968 - 1982 | 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 | 1 |
| McPherson, Coco | Coco McPherson | Actor | 1989 - 1995 | 6 | 1 |
| 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, Valeria | Valeria 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 | 1 |
| 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 | 1 |
| McDevitt, Lorna | Lorna McDevitt | Actor | 2005 | 6 | |
| McCallum, Eileen | Eileen McCallum | Actor | 2005 | 6 | |
| Moltzen, Peter | Peter Moltzen | Actor | 2005 - 2007 | 6 | 1 |
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