| Matsuno, Kennichi | Kennichi Matsuno | Actor | 1980 | 1 | |
| Michel, Ingulf | Ingulf Michel | Actor | 1980 - 2002 | 5 | |
| Miksch, Wolfgang | Wolfgang Miksch | Actor | 1980 | 1 | |
| Mielau, Doris | Doris Mielau | Actor | 1980 | 1 | |
| Masch, Hansjörg | Hansjörg Masch | Dramaturg | 1980 | 1 | |
| Melang, Dean | Dean Melang | Actor | 1980 | 1 | |
| Moraitis, Konstantinos | Konstantinos Moraitis | Actor | 2014 | 1 | |
| Murányi, Tünde | Tünde Murányi | Actor | 1994 | 1 | |
| Mahon, Niamh | Niamh Mahon | Actor | 1980 | 1 | |
| McCabe, Vincent | Vincent McCabe | Actor | 1980 - 2003 | 3 | |
| Moore, Richard | Richard Moore | Actor | 1980 | 1 | |
| Matull, Oskar | Oskar Matull | Actor | 1980 - 1997 | 2 | |
| Molloy, John | John Molloy | Actor | 1980 | 1 | |
| Midgley, Robin | Robin Midgley | Director | 1969 - 1980 | 2 | |
| McKeown, Fintan | Fintan McKeown | Actor | 1980 - 2010 | 2 | |
| McKay, John | John McKay | Actor | 1980 | 1 | |
| Manville, Lesley | Lesley Manville | Actor | 2005 - 2015 | 5 | |
| McKenna, Charlene | Charlene McKenna | Actor | 2013 - 2015 | 4 | |
| Morick, Jeanine | Jeanine Morick | Actor | 1980 | 2 | |
| Maranto, Mark, Christopher | Mark Christopher Maranto | Actor | 1980 | 1 | |
| Marshall, William, Horace | William Horace Marshall | Actor | 1980 | 2 | |
| McGreevy, Barbara | Barbara McGreevy | Actor | 1980 | 1 | |
| Mink, David | David Mink | Actor | 1980 | 2 | |
| Munro, Claude | Claude Munro | Designer | 1980 | 1 | |
| Moore, Andrew | Andrew Moore | Actor | 1980 | 2 | |
| Mosher, Gregory | Gregory Mosher | Director | 1980 | 2 | |
| Maude-Roxby, Roddy | Roddy Maude-Roxby | Actor | 2012 | 1 | |
| Mantle, Doreen | Doreen Mantle | Actor | 1975 - 2011 | 2 | |
| Minegishi, Ryoko | Ryoko Minegishi | Actor | 1994 | 1 | |
| Morrison, Conall | Conall Morrison | Director | 2000 - 2003 | 2 | |
| Milner, Roger | Roger Milner | Actor | 1980 | 1 | |
| MacHugh, Melanie | Melanie MacHugh | Actor | 2000 | 1 | |
| Marcell, Joseph | Joseph Marcell | Actor | 2000 | 1 | |
| Marlowe, Christopher | Christopher Marlowe | Actor | 1980 | 1 | |
| McIntyre, Colin | Colin McIntyre | Director | 1969 - 1980 | 2 | |
| McKenna, Kathy | Kathy McKenna | Actor | 1980 | 1 | |
| Maclean, Calvin | Calvin Maclean | Director | 1980 | 1 | |
| Maglietta, Maria | Maria Maglietta | Actor, Costume Designer, Designer | 1994 - 1996 | 6 | |
| Molinari, Renata | Renata Molinari | Adaptation | 1994 - 1996 | 2 | |
| Medeiros, Francisco | Francisco Medeiros | Director | 2011 | 1 | |
| Medina, Marcio | Marcio Medina | Costume Designer, Designer | 1990 - 2011 | 3 | |
| Menezes, Tereza | Tereza Menezes | Dramaturg | 2011 | 1 | |
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