| Mathias, Sean | Sean Mathias | Director | 1993 | 3 | 1 |
| Mezon, Jim | Jim Mezon | Actor | 1989 - 2012 | 3 | 1 |
| Macdonald, Robert David | Robert David Macdonald | Translator | 1991 | 1 | 1 |
| Marsden, Roy | Roy Marsden | Actor | 1991 | 1 | 1 |
| Mafham, Dominic | Dominic Mafham | Actor | 1991 - 2014 | 2 | 1 |
| McCann, Donal | Donal McCann | Actor | 1993 | 1 | 1 |
| McElhinney, Mandy | Mandy McElhinney | Actor | 1993 | 1 | 1 |
| Müller-Merten, Heike | Heike Müller-Merten | Dramaturg | 1993 - 2006 | 5 | 1 |
| Monroe, Jarion | Jarion Monroe | Actor | 1993 | 1 | 1 |
| Manchen, Klaus | Klaus Manchen | Actor | 1993 - 1996 | 2 | 1 |
| Messalas, Giorgos | Giorgos Messalas | Actor, Costume Designer, Director | 1993 - 2001 | 7 | 1 |
| Melles, Sunnyi | Sunnyi Melles | Actor | 1991 | 1 | 1 |
| Márkus, Alfréd | Alfréd Márkus | Translator | 1999 | 1 | 1 |
| Maalouf, Mireille | Mireille Maalouf | Actor | 2012 - 2018 | 32 | 1 |
| Martinovics, Dorina | Dorina Martinovics | Actor | 2013 | 1 | 1 |
| Martin, Márta | Márta Martin | Actor | 2013 | 1 | 1 |
| Muranyi-Kovacs, Françoise | Françoise Muranyi-Kovacs | Actor | 1994 | 1 | 1 |
| Maxwell, Michelle | Michelle Maxwell | Musician | 1994 | 1 | 1 |
| McWhinnie, Donald | Donald McWhinnie | Director | 1959 - 1982 | 2 | 1 |
| Murray, Jane | Jane Murray | Actor | 1982 | 2 | 1 |
| Madden, John | John Madden | Director | 1982 | 1 | 1 |
| Marquardt, Fritz | Fritz Marquardt | Director | 1982 - 1995 | 2 | 1 |
| McCabe, Vincent | Vincent McCabe | Actor | 1980 - 2003 | 3 | 1 |
| Midgley, Robin | Robin Midgley | Director | 1969 - 1980 | 2 | 1 |
| Manville, Lesley | Lesley Manville | Actor | 2005 - 2015 | 5 | 1 |
| McKenna, Charlene | Charlene McKenna | Actor | 2013 - 2015 | 4 | 1 |
| Marshall, William, Horace | William Horace Marshall | Actor | 1980 | 2 | 1 |
| Mosher, Gregory | Gregory Mosher | Director | 1980 | 2 | 1 |
| Maude-Roxby, Roddy | Roddy Maude-Roxby | Actor | 2012 | 1 | 1 |
| Mantle, Doreen | Doreen Mantle | Actor | 1975 - 2011 | 2 | 1 |
| Morrison, Conall | Conall Morrison | Director | 2000 - 2003 | 2 | 1 |
| Marcell, Joseph | Joseph Marcell | Actor | 2000 | 1 | 1 |
| Maclean, Calvin | Calvin Maclean | Director | 1980 | 1 | 1 |
| Menezes, Tereza | Tereza Menezes | Dramaturg | 2011 | 1 | 1 |
| Milani, Patrizia | Patrizia Milani | Actor | 1994 - 2013 | 18 | 1 |
| Mrkvička, Ladislav | Ladislav Mrkvička | Actor | 1994 - 2009 | 6 | 1 |
| McPherson, Coco | Coco McPherson | Actor | 1989 - 1995 | 6 | 1 |
| McKereghan, Dan | Dan McKereghan | Adaptation, Director | 1997 | 2 | 1 |
| Martin, Jill Cary | Jill Cary Martin | Actor | 1997 | 1 | 1 |
| Murphy, Rosemary | Rosemary Murphy | Actor | 1980 - 1999 | 2 | 1 |
| McClemens, Julie | Julie McClemens | Actor | 1996 | 1 | 1 |
| Mattson, Kalle | Kalle Mattson | Actor, Musician | 1996 | 2 | 1 |
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