| Moe, Aslak | Aslak Moe | Dramaturg | 2020 | 5 | |
| Malmgren, Oskar, | Oskar Malmgren | Director, Translator | 1878 – 1885 | 10 | |
| Muinzer, Louis | Louis Muinzer | Director, Translator | 1983 – 1990 | 6 | |
| Mirski, Krastjo | Krastjo Mirski | Director, Translator | 1956 – 1962 | 2 | |
| Mouzenidis, Takis | Takis Mouzenidis | Director, Translator | 1945 – 1965 | 5 | |
| Martinelli, Jean-Louis | Jean-Louis Martinelli | Director, Translator | 2010 – 2012 | 6 | |
| Mellor, Aubrey | Aubrey Mellor | Director, Translator | 1984 – 1989 | 3 | |
| Milčin, Ilija | Ilija Milčin | Director, Translator | 1957 | 2 | |
| Mesarić, Kulman | Kulman Mesarić | Director, Translator | 1948 | 2 | |
| Mosarov, Vladimir | Vladimir Mosarov | Director, Sound Designer | 2001 | 2 | |
| McCready, Kelly | Kelly McCready | Director, Sound Designer | 2016 | 2 | |
| McLaren, Robert | Robert McLaren | Director, Lighting Designer | 2006 | 6 | |
| Mason, Marshall W. | Marshall W. Mason | Director, Lighting Designer | 1964 | 2 | |
| Mercado, Antonio | Antonio Mercado | Director, Lighting Designer | 2006 – 2007 | 15 | |
| Manea , Aureliu | Aureliu Manea | Director, Lighting Designer | 1968 | 2 | |
| Marcussen, Yngve, | Yngve Marcussen | Director, Dramaturg | 2012 – 2015 | 6 | |
| Mädler , Kathrin | Kathrin Mädler | Director, Dramaturg | 2011 – 2017 | 4 | |
| Mehrjul, Dariush | Dariush Mehrjul | Director | 1993 | 1 | |
| Mejerchol'd, Vsevolod Ė., | Vsevolod Ė. Mejerchol'd (Vsevolod Ė. Mejerchol'd) | Director | 1906 | 2 | |
| Maack, Ulrike | Ulrike Maack | Director | 1996 | 1 | |
| Mack, Duncan | Duncan Mack | Director | 2002 | 1 | |
| Magelli, Paolo | Paolo Magelli | Director | 1999 | 1 | |
| Magill, Simon | Simon Magill | Director | 2000 | 1 | |
| Makai, Péter | Péter Makai | Director | 1961 | 1 | |
| Marchant, Jules-Henri | Jules-Henri Marchant | Director | 2002 | 1 | |
| Marcks, Albrecht, | Albrecht Marcks | Director | 1876 – 1891 | 5 | |
| Marton, László | László Marton | Director | 2001 – 2005 | 5 | |
| Mbugua, Ian | Ian Mbugua | Director | 2006 | 1 | |
| McAllister, Peter | Peter McAllister | Director | 2004 | 5 | |
| McDonald-Lewis, Mary | Mary McDonald-Lewis | Director | 2007 | 1 | |
| McNamara, Cienda | Cienda McNamara | Director | 2008 | 1 | |
| McSweeney, Kevin | Kevin McSweeney | Director | 2001 | 2 | |
| Melldahl, Åsa | Åsa Melldahl | Director | 2000 – 2008 | 3 | |
| Meltke, Martin | Martin Meltke | Director | 1981 | 1 | |
| Mentzel, Horst | Horst Mentzel | Director | 1975 | 1 | |
| Mercure, Jean | Jean Mercure | Director | 1952 | 1 | |
| Metcalfe, Edgar | Edgar Metcalfe | Director | 1970 | 3 | |
| Michaels, Stephen | Stephen Michaels | Director | 1991 | 1 | |
| Militaru, Sorin | Sorin Militaru | Director | 2006 | 2 | |
| Mills, Liz, | Liz Mills | Director | 1995 | 1 | |
| Molitorisz, Manfred | Manfred Molitorisz | Director | 1980 | 1 | |
| Montgomery, Gary | Gary Montgomery | Director | 1974 | 1 | |
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