| Miletineanu, Gheorghe | Gheorghe Miletineanu | Director | 1969 | 2 | |
| Müller, Gotthard | Gotthard Müller | Director | 1968 | 1 | |
| Mitchell, Betty | Betty Mitchell | Director | 1968 | 1 | |
| Machiz, Herbert | Herbert Machiz | Director | 1968 | 1 | |
| Milićević, Ognjenka | Ognjenka Milićević | Director | 1967 | 1 | |
| Meyer-Hanno, Andreas | Andreas Meyer-Hanno | Director | 1966 | 1 | |
| Mitchell, Irene | Irene Mitchell | Director | 1966 | 1 | |
| Metten, Charles | Charles Metten | Director | 1965 | 1 | |
| Moén, Mari | Mari Moén | Director | 2002 | 1 | |
| Madeira, Rui | Rui Madeira | Director | 2002 | 3 | |
| Montel, Max | Max Montel | Director | 2002 | 1 | |
| Milianti, Alain | Alain Milianti | Director | 2002 | 4 | |
| Milikowsky, Shira | Shira Milikowsky | Director | 2003 | 1 | |
| Myers, William | William Myers | Director | 2003 | 1 | |
| McConnell, Phil | Phil McConnell | Director | 2001 | 1 | |
| Morell, Andreas | Andreas Morell | Director | 2001 | 2 | |
| M. Lancisi, Vincent | Vincent M. Lancisi | Director | 2003 | 1 | |
| Martin, Dustin | Dustin Martin | Director | 2003 | 1 | |
| Müller, Frank | Frank Müller | Director | 2003 – 2004 | 1 | |
| Muse, Ann | Ann Muse | Director | 2004 | 1 | |
| Moscone, Jonathan | Jonathan Moscone | Director | 2004 | 1 | |
| Messaglia, Carla | Carla Messaglia | Director | 2004 | 1 | |
| McSpadyen, John | John McSpadyen | Director | 2004 | 1 | |
| May, Roland | Roland May | Director | 2004 – 2005 | 2 | |
| Mustafić, Dino | Dino Mustafić | Director | 2013 – 2015 | 3 | |
| Matiášek, Miloš | Miloš Matiášek | Director | 1962 | 1 | |
| Murua, Steve | Steve Murua | Director | 2005 | 1 | |
| Matĕjovský, Jan | Jan Matĕjovský | Director | 1955 | 1 | |
| Morton, Paul | Paul Morton | Director | 2005 | 1 | |
| Mason, Marshall K. | Marshall K. Mason | Director | 2001 | 2 | |
| Meij, Mieneke | Mieneke Meij | Director | 2005 | 1 | |
| Maddalena, Sara | Sara Maddalena | Director | 2005 – 2006 | 2 | |
| Mizu , Mime | Mime Mizu | Director | 1924 – 1925 | 1 | |
| Marneus, Shirley | Shirley Marneus | Director | 2001 | 1 | |
| Mackmin , Anna | Anna Mackmin | Director | 2007 – 2012 | 3 | |
| Megel, Joseph | Joseph Megel | Director | 2006 – 2013 | 2 | |
| Maier, Brigitte | Brigitte Maier | Director | 1989 | 1 | |
| Maples, Carol J. | Carol J. Maples | Director | 2006 | 1 | |
| Mata, Mike | Mike Mata | Director | 2006 | 1 | |
| Meul, Dirk | Dirk Meul | Director | 2007 | 1 | |
| Méndez , Emilio | Emilio Méndez | Director | 2007 | 1 | |
| Molinari, Nadia | Nadia Molinari | Director | 2012 | 1 | |
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