| McAlister, Evelyn | Evelyn McAlister | Actor | 1983 | 2 | |
| Mulvenna, Declan | Declan Mulvenna | Actor | 1983 | 2 | |
| Mirski, Krastjo | Krastjo Mirski | Director, Translator | 1956 – 1962 | 2 | |
| Mühler, Peter | Peter Mühler | Designer | 1958 | 2 | |
| Madl, Ferdinand | Ferdinand Madl | Costume Designer | 1958 | 2 | |
| Morley, Carol | Carol Morley | Actor | 1978 | 2 | |
| Méndez, José | José Méndez | Costume Designer, Designer | 1981 | 2 | |
| Minkov, Margarit | Margarit Minkov | Adaptation, Director | 1991 | 2 | |
| Mankovecký, Róbert | Róbert Mankovecký | Composer, Dramaturg | 1993 | 2 | |
| Morley, Christopher | Christopher Morley | Costume Designer, Designer | 1983 | 2 | |
| Myklestad, Willy | Willy Myklestad | Lighting Designer | 1983 | 2 | |
| Mueller, Bine | Bine Mueller | Actor | 1983 | 2 | |
| McGuigan, Marcy | Marcy McGuigan | Actor | 2000 | 2 | |
| Mitra, Saoli | Saoli Mitra | Actor, Director | 2002 | 2 | |
| Malcolm, Duncan | Duncan Malcolm | Actor | 2009 | 2 | 1 |
| McCormack, Catherine | Catherine McCormack | Actor | 2008 | 2 | |
| Märker, Thomas | Thomas Märker | Lighting Designer | 2004 – 2009 | 2 | |
| Moss, Hannah | Hannah Moss | Adaptation, Director | 2008 | 2 | |
| Mortensen, Elisabeth | Elisabeth Mortensen | Actor | 2008 | 2 | 1 |
| Mascall, Tim | Tim Mascall | Lighting Designer | 2009 | 2 | |
| Melles, Judith | Judith Melles | Actor | 1976 | 2 | |
| Moore, Christopher | Christopher Moore | Actor, Sound Designer | 1983 – 1999 | 2 | |
| Matthews, Dakin | Dakin Matthews | Actor | 1983 – 1986 | 2 | |
| Mess, Attila | Attila Mess | Actor | 2011 | 2 | |
| Montenegro, Carlos | Carlos Montenegro | Actor | 2011 – 2012 | 2 | |
| Miranda, Miguel | Miguel Miranda | Composer | 2011 – 2018 | 2 | |
| Mardzoeki, Faiza | Faiza Mardzoeki | Adaptation, Translator | 2011 | 2 | |
| Major, Melinda | Melinda Major | Actor | 2002 | 2 | |
| Manger, Burkhard | Burkhard Manger | Costume Designer, Designer | 1984 | 2 | |
| Munk, Holger | Holger Munk | Actor | 1964 | 2 | |
| Mayer, Christian | Christian Mayer | Dramaturg | 2007 – 2012 | 2 | |
| Morgan, Caryl | Caryl Morgan | Actor | 2012 | 2 | |
| Moore, Vivienne | Vivienne Moore | Actor | 2012 | 2 | |
| Matthisen, Roger | Roger Matthisen | Actor | 2001 | 2 | |
| Magennis, Dermot | Dermot Magennis | Actor | 2012 – 2013 | 2 | |
| Malmberg, Benoît | Benoît Malmberg | Director | 2012 | 2 | |
| Medo, Hans | Hans Medo | Actor | 1957 | 2 | |
| Murphy, Aaron | Aaron Murphy | Actor | 2003 – 2012 | 2 | 1 |
| Morosi, Ugo Maria | Ugo Maria Morosi | Actor | 1984 – 1985 | 2 | |
| Mazáčová, Zuzana | Zuzana Mazáčová | Costume Designer, Designer | 2012 | 2 | |
| McCoy, Jody | Jody McCoy | Actor | 2013 | 2 | 2 |
| Mogg, Nann | Nann Mogg | Actor | 1984 | 2 | |
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