| McBurney, Christine | Christine McBurney | Assistant Director, Director | 2017 - 2022 | 2 | |
| McBride, Don | Don McBride | Designer | 2017 | 1 | |
| Meek, Arthur | Arthur Meek | Actor | 2017 | 1 | |
| McRae, Katherine | Katherine McRae | Director | 2017 | 1 | |
| McShane, Marcus | Marcus McShane | Lighting Designer | 2017 | 1 | |
| Moradi, Kiumars | Kiumars Moradi | Dramaturg | 2017 | 1 | |
| Mousavi, Seyed Mohammad | Seyed Mohammad Mousavi | Designer | 2017 | 1 | |
| Mesgari, Mohammad | Mohammad Mesgari | Actor | 2017 | 1 | |
| Mousavi, Marzieh | Marzieh Mousavi | Actor | 2017 | 1 | |
| Mues, Wanja | Wanja Mues | Actor | 2016 | 1 | |
| Musgrave, John | John Musgrave | Actor | 2017 | 1 | |
| Moody, April | April Moody | Actor | 1978 | 1 | |
| McMenamin, Patricia | Patricia McMenamin | Actor | 1980 | 16 | |
| Mythen, Máirín | Máirín Mythen | Actor | 1980 | 16 | |
| Mantschenko-Feredzhanova, Darina | Darina Mantschenko-Feredzhanova | Costume Designer | 1980 | 1 | |
| Massalitinova, Tanja | Tanja Massalitinova | Actor | 1980 | 1 | |
| Miladinov, Georgi | Georgi Miladinov | Actor | 1980 | 1 | |
| Marinov, Marin | Marin Marinov | Designer | 1980 | 1 | |
| Mesnik, William | William Mesnik | Actor | 1981 | 1 | |
| Murphy, Peg | Peg Murphy | Actor | 1981 | 1 | |
| Mell, Randle | Randle Mell | Actor | 1981 | 1 | |
| Moore, Keith | Keith Moore | Actor | 1981 | 1 | |
| McMullen, William, L. | William L. McMullen | Actor | 1981 | 1 | |
| Morton, Joe | Joe Morton | Actor | 1981 | 1 | |
| McGann, Michael, John | Michael John McGann | Actor | 1981 | 1 | |
| McLusky, Graham | Graham McLusky | Lighting Designer | 1981 | 1 | |
| Mullarkey, Maggie | Maggie Mullarkey | Actor | 1981 | 1 | |
| Morgan, Margaret | Margaret Morgan | Director | 1981 | 1 | |
| Moutsinas, Lefteris | Lefteris Moutsinas | Composer | 2016 - 2017 | 2 | |
| Miller, Randy | Randy Miller | Actor | 1981 | 1 | |
| Mohrmann, Peter | Peter Mohrmann | Actor | 1981 | 1 | |
| Mendoza, John | John Mendoza | Actor | 1981 | 1 | |
| Madeira, Marcia | Marcia Madeira | Lighting Designer | 1981 | 1 | |
| Marsans, Elena | Elena Marsans | Lighting Designer | 1981 | 1 | |
| Manzano, Virginia | Virginia Manzano | Actor | 1981 | 1 | |
| Mérida, Yolanda | Yolanda Mérida | Actor | 1981 | 1 | |
| Martínez, Justo | Justo Martínez | Actor | 1981 | 1 | |
| Mitsakou, Louiza | Louiza Mitsakou | Actor | 1981 | 10 | |
| Marks, Louis | Louis Marks | Producer | 1982 - 1987 | 2 | |
| Mayer, John | John Mayer | Actor | 1983 | 1 | |
| McGee, Tim | Tim McGee | Actor | 1983 | 1 | |
| Marinov, Dimitar | Dimitar Marinov | Actor, Composer | 1983 | 2 | |
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