| McCarthy, James | James McCarthy | Actor | 1948 | 2 | |
| Mathews, Gervaise | Gervaise Mathews | Actor | 1948 - 1949 | 2 | |
| Magalhães, Aloísio | Aloísio Magalhães | Costume Designer, Designer | 1949 | 2 | |
| Mulder, Steffen | Steffen Mulder | Actor, Dancer | 2017 - 2019 | 2 | |
| Mortensen, Linnea, Sunde | Linnea Sunde Mortensen | Actor, Dancer | 2017 - 2018 | 2 | |
| Murić, Momčilo | Momčilo Murić | Actor | 2000 | 2 | |
| Mladenović, Kokan | Kokan Mladenović | Adaptation, Director | 2000 | 2 | |
| Moskovljević, Miloš | Miloš Moskovljević | Translator | 2000 - 2013 | 2 | |
| Malochevskaja, Irina | Irina Malochevskaja | Dramaturg | 2014 - 2018 | 2 | |
| Merlo, Giuliano | Giuliano Merlo | Director | 1973 - 1974 | 2 | |
| Mariani, Guido | Guido Mariani | Lighting Designer | 1973 - 1974 | 2 | |
| Molnar, Teodor | Teodor Molnar | Sound Designer | 2013 - 2015 | 2 | |
| McQuade, Kris | Kris McQuade | Actor | 1971 | 2 | |
| Merkert, Angelika | Angelika Merkert | Actor | 1971 - 1977 | 2 | |
| Moruzan, Constantin | Constantin Moruzan | Adaptation, Director | 1956 | 2 | |
| Mihăilescu, Ion | Ion Mihăilescu | Director | 1956 - 1980 | 2 | |
| Munteanu, Cristian | Cristian Munteanu | Adaptation, Director | 1979 | 2 | |
| Mertens, Klaus | Klaus Mertens | Actor | 1973 | 2 | |
| Müller, K.- D. | K.- D. Müller | Actor | 1973 | 2 | |
| Morris, Christopher | Christopher Morris | Actor | 2016 | 2 | |
| Muller, Karel | Karel Muller | Adaptation, Translator | 1976 | 2 | |
| Møller, Peter, Kohlmetz | Peter Kohlmetz Møller | Composer, Sound Designer | 2013 | 2 | |
| Maresch, Jacques | Jacques Maresch | Conductor | 2017 | 2 | |
| Morin, Olivier | Olivier Morin | Actor, Adaptation | 2017 | 2 | |
| Morfopoulos, Konstantin | Konstantin Morfopoulos | Actor | 2015 | 2 | |
| McCowan, George | George McCowan | Actor, Director | 1957 - 1978 | 2 | |
| Moro, Moreno | Moreno Moro | Conductor | 1978 - 1980 | 2 | |
| Massie, Paul | Paul Massie | Actor | 1966 - 1978 | 2 | |
| Mahoney, Christine | Christine Mahoney | Actor | 1978 | 2 | |
| Marthinsen, Ada | Ada Marthinsen | Actor | 2017 - 2020 | 2 | |
| Mattsson, Niklas | Niklas Mattsson | Actor | 2017 - 2020 | 2 | |
| McBurney, Christine | Christine McBurney | Assistant Director, Director | 2017 - 2022 | 2 | |
| Moutsinas, Lefteris | Lefteris Moutsinas | Composer | 2016 - 2017 | 2 | |
| Marks, Louis | Louis Marks | Producer | 1982 - 1987 | 2 | |
| Marinov, Dimitar | Dimitar Marinov | Actor, Composer | 1983 | 2 | |
| Marra, Eirini | Eirini Marra | Adaptation | 1984 - 1985 | 2 | |
| Mikoleit, Klaus | Klaus Mikoleit | Actor | 1984 | 2 | |
| Mesarić, Želimir | Želimir Mesarić | Director | 1984 - 1996 | 2 | |
| Magherini, Riccardo | Riccardo Magherini | Actor | 1986 | 2 | |
| Manera, Dario | Dario Manera | Actor | 1986 | 2 | |
| Marconi, Claudio | Claudio Marconi | Actor | 1986 | 2 | |
| Mendogni, Luca | Luca Mendogni | Actor | 1986 | 2 | |
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