| Moén, Mari | Mari Moén | Director | 2002 | 1 | |
| Montel, Max | Max Montel | Director | 2002 | 1 | 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 - 2007 | 2 | 1 |
| M. Lancisi, Vincent | Vincent M. Lancisi | Director | 2003 | 1 | 1 |
| Martin, Dustin | Dustin Martin | Director | 2003 | 1 | |
| Müller, Frank | Frank Müller | Director | 2003 | 1 | |
| Muse, Ann | Ann Muse | Director | 2004 | 1 | |
| Moscone, Jonathan | Jonathan Moscone | Director | 2004 | 1 | |
| Messaglia, Carla | Carla Messaglia | Director | 2003 - 2004 | 3 | |
| McSpadyen, John | John McSpadyen | Director | 2004 | 1 | |
| May, Roland | Roland May | Director | 2004 | 2 | 1 |
| 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 - 1958 | 2 | 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 | 1 | |
| Marneus, Shirley | Shirley Marneus | Director | 2001 | 1 | |
| Mackmin, Anna | Anna Mackmin | Director | 2007 - 2012 | 3 | 1 |
| 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 | |
| Munson, John | John Munson | Director | 2016 | 1 | |
| Moorby, Frank | Frank Moorby | Director | 2012 | 1 | |
| Mantaropoulos, Giorgos | Giorgos Mantaropoulos | Director | 2006 | 1 | |
| Münch, Josef | Josef Münch | Director | 1920 | 1 | |
| Marting, Kristin | Kristin Marting | Director | 2009 - 2010 | 2 | 1 |
| Maurach, Johannes | Johannes Maurach | Director | 1922 - 1943 | 2 | |
| Miltner, Rudolf | Rudolf Miltner | Director | 1923 | 1 | |
| Maisch, Herbert | Herbert Maisch | Director | 1928 | 1 | |
| Möller, A. | A. Möller | Director | 1934 | 1 | |
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