| 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 | |
| Malacrida, Bernardo | Bernardo Malacrida | Director | 1965 | 1 | |
| Mayo, Devon, de | Devon de Mayo | Director | 2008 | 1 | |
| Menendian, Michael | Michael Menendian | Director | 2009 | 1 | |
| Miller, Les | Les Miller | Director | 2009 | 1 | |
| Murugesan, K. | K. Murugesan | Director | 2015 | 1 | |
| Miyagi, Satoshi | Satoshi Miyagi | Director | 2010 - 2023 | 3 | |
| Melo, Jorge, Silva | Jorge Silva Melo | Director | 2010 | 2 | |
| Miyata, Keiko | Keiko Miyata | Director | 2010 | 1 | 1 |
| Mikat, Mareike | Mareike Mikat | Director | 2014 - 2016 | 17 | |
| Morden, David | David Morden | Director | 2010 | 1 | |
| Melson, Søren | Søren Melson | Director | 1964 | 1 | |
| Malaev-Babel, Andrei | Andrei Malaev-Babel | Director | 2011 - 2019 | 2 | |
| Macdonald, James | James Macdonald | Director | 2010 - 2011 | 2 | 1 |
| McNamara, Robert | Robert McNamara | Director | 2012 | 1 | 1 |
| Morasch, Juri | Juri Morasch | Director | 2012 | 1 | |
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