| Müther, Adelheid | Adelheid Müther | Director | 1990 - 2003 | 42 | |
| Morey, Charles | Charles Morey | Director | 1991 | 1 | 1 |
| Mignon, Jean-Pierre | Jean-Pierre Mignon | Director | 1990 | 1 | 1 |
| McRobie, Brenda | Brenda McRobie | Director | 1990 | 1 | |
| Markus, Tom | Tom Markus | Director | 1981 - 1991 | 2 | 1 |
| Moog, Willy | Willy Moog | Director | 1953 - 1960 | 3 | |
| Masson, John | John Masson | Director | 1992 | 2 | |
| Mason, Patrick | Patrick Mason | Director | 1988 | 1 | |
| Martinus, Derek | Derek Martinus | Director | 1992 | 1 | |
| Mitchell, Katie | Katie Mitchell | Director | 1993 - 1994 | 3 | 1 |
| Matuszak, Brian | Brian Matuszak | Director | 1993 | 1 | |
| Mathias, Sean | Sean Mathias | Director | 1993 | 3 | 1 |
| Max, Bruno | Bruno Max | Director | 1991 | 1 | |
| Masuth, Matthias | Matthias Masuth | Director | 1982 | 1 | |
| Myllymäki, Anita | Anita Myllymäki | Director | 1982 | 1 | |
| McWhinnie, Donald | Donald McWhinnie | Director | 1959 - 1982 | 2 | 1 |
| Madden, John | John Madden | Director | 1982 | 1 | 1 |
| Marquardt, Fritz | Fritz Marquardt | Director | 1982 - 1995 | 2 | 1 |
| Maciejowski, Jan | Jan Maciejowski | Director | 1994 | 1 | |
| Midgley, Robin | Robin Midgley | Director | 1969 - 1980 | 2 | 1 |
| Mosher, Gregory | Gregory Mosher | Director | 1980 | 2 | 1 |
| Morrison, Conall | Conall Morrison | Director | 2000 - 2003 | 2 | 1 |
| McIntyre, Colin | Colin McIntyre | Director | 1969 - 1980 | 2 | |
| Maclean, Calvin | Calvin Maclean | Director | 1980 | 1 | 1 |
| Medeiros, Francisco | Francisco Medeiros | Director | 2011 | 1 | |
| Matthus, Frank | Frank Matthus | Director | 1996 - 1998 | 2 | |
| McDougall, Gordon | Gordon McDougall | Director | 1980 | 1 | 1 |
| Mentha, Dominique | Dominique Mentha | Director | 1996 | 1 | 1 |
| McIntosh, Duncan | Duncan McIntosh | Director | 1989 - 1996 | 2 | 1 |
| Miśkiewicz, Paweł | Paweł Miśkiewicz | Director | 1995 - 2007 | 3 | 1 |
| Mizuta, Haruyasu | Haruyasu Mizuta | Director | 1995 | 1 | |
| Metzler, Volker | Volker Metzler | Director | 2002 | 1 | 1 |
| Martin, Melanie | Melanie Martin | Director | 1998 | 1 | |
| Marini, Ken | Ken Marini | Director | 2011 - 2014 | 2 | |
| Müller, Werner | Werner Müller | Director | 2006 - 2014 | 2 | |
| Miletineanu, Gheorghe | Gheorghe Miletineanu | Director | 1969 - 1978 | 2 | |
| Müller, Gotthard | Gotthard Müller | Director | 1968 | 1 | |
| Mitchell, Betty | Betty Mitchell | Director | 1968 | 1 | |
| Machiz, Herbert | Herbert Machiz | Director | 1968 | 1 | 1 |
| Milićević, Ognjenka | Ognjenka Milićević | Director | 1967 | 1 | 1 |
| Meyer-Hanno, Andreas | Andreas Meyer-Hanno | Director | 1966 | 1 | |
| Mitchell, Irene | Irene Mitchell | Director | 1966 | 1 | |
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