| Moore, Christopher | Christopher Moore | Actor, Sound Designer | 1983 - 1999 | 2 | 1 |
| Matyka, Karolina | Karolina Matyka | Actor, Stage Manager | 2025 | 2 | |
| Munch-Møller, Asger | Asger Munch-Møller | Actor, Translator | 1983 - 1990 | 3 | 1 |
| Martins, José | José Martins | Actor, Translator | 1997 - 1998 | 6 | |
| Machado, A. Reis | A. Reis Machado | Adaptation | 1990 | 1 | 1 |
| Mikkelsen, Magnar | Magnar Mikkelsen | Adaptation | 1975 - 1976 | 9 | 1 |
| Murray-Smith, Joanna | Joanna Murray-Smith | Adaptation | 2013 - 2022 | 2 | |
| Martinus, Eivor | Eivor Martinus | Adaptation | 1992 | 1 | 1 |
| Molinari, Renata | Renata Molinari | Adaptation | 1994 - 1996 | 2 | |
| Mitchell, Adrian | Adrian Mitchell | Adaptation | 1980 | 1 | 1 |
| Mayorga, Juan | Juan Mayorga | Adaptation | 2007 - 2023 | 9 | 1 |
| Meyer, Martin | Martin Meyer | Adaptation | 1968 | 1 | |
| Maxwell, Ryan | Ryan Maxwell | Adaptation | 2004 | 1 | |
| McCracken, Dave | Dave McCracken | Adaptation | 2005 | 1 | 1 |
| Morstin, Ludwik, Hieronim | Ludwik Hieronim Morstin | Adaptation | 1964 | 1 | |
| Maigne, Charles | Charles Maigne | Adaptation | 1918 | 1 | |
| Moncada, Luis Mario | Luis Mario Moncada | Adaptation | 2006 | 1 | |
| Mendes, José Maria, Vieira | José Maria Vieira Mendes | Adaptation | 2010 | 2 | 1 |
| Mengyuan, Chen | Chen Mengyuan | Adaptation | 2010 | 1 | |
| Mlalazi, Christopher | Christopher Mlalazi | Adaptation | 2015 - 2016 | 2 | |
| Matsakidou, Sevi | Sevi Matsakidou | Adaptation | 2013 | 1 | |
| Maltrana, Isidro | Isidro Maltrana | Adaptation | 1999 | 1 | 1 |
| Murray, Steve | Steve Murray | Adaptation | 1999 | 1 | |
| Maaniittu, Seppo | Seppo Maaniittu | Adaptation | 1972 | 1 | |
| Marra, Eirini | Eirini Marra | Adaptation | 1984 - 1985 | 2 | |
| McKeon, Belinda | Belinda McKeon | Adaptation | 2017 | 1 | 1 |
| Maillie, Tereasa | Tereasa Maillie | Adaptation | 2019 | 1 | |
| Mohamad Faqe, Goran | Goran Mohamad Faqe | Adaptation | 2016 | 1 | |
| Mora, José Manuel | José Manuel Mora | Adaptation | 2019 | 1 | |
| Mercer, David | David Mercer | Adaptation | 1973 | 1 | |
| Moen, Geir | Geir Moen | Adaptation | 2022 | 1 | |
| McGuiness, Frank | Frank McGuiness | Adaptation | 2022 | 1 | |
| Marquerie, Alfredo | Alfredo Marquerie | Adaptation | 1963 | 2 | |
| Molina, Romualdo | Romualdo Molina | Adaptation | 1971 | 1 | |
| Madeley, Harriet | Harriet Madeley | Adaptation | 2023 | 1 | |
| Macmillan, Duncan | Duncan Macmillan | Adaptation | 2023 - 2024 | 5 | |
| Macrì, Danilo | Danilo Macrì | Adaptation | 2018 | 5 | |
| Mauri, Enzo | Enzo Mauri | Adaptation | 1954 | 1 | |
| McKean, Kathy | Kathy McKean | Adaptation | 2024 | 1 | |
| Mainardi, Renato | Renato Mainardi | Adaptation | 1972 | 1 | |
| Muñoz, Matilde | Matilde Muñoz | Adaptation | 1932 | 1 | |
| Moravec, Michal | Michal Moravec | Adaptation | 2023 - 2024 | 5 | |
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