| Munkwitz, Adolf, | Adolf Munkwitz | Director | 1911 | 1 | |
| Meyer-Bruhns, Adolf, | Adolf Meyer-Bruhns | Director | 1937 - 1938 | 2 | |
| Meltzer, Charles Henry, | Charles Henry Meltzer (Charles Henry Meltzer) | Director | 1900 | 1 | |
| Mandrovitsch, Adam, | Adam Mandrovitsch | Director | 1901 | 1 | |
| Martyn, Edward, | Edward Martyn | Director | 1903 - 1904 | 2 | |
| Moore, George, | George Moore | Director | 1903 - 1904 | 2 | |
| Michaelson, Knut, | Knut Michaelson | Director | 1908 | 1 | |
| Milton, Robert, | Robert Milton | Director | 1910 | 2 | |
| Murray, Braham, | Braham Murray | Director | 1999 - 2001 | 2 | |
| Mithassel, Reinert, | Reinert Mithassel | Director | 1991 | 1 | |
| Myhren, Dagne Groven, | Dagne Groven Myhren | Director | 1994 - 1995 | 2 | |
| Moberg, Kjell, | Kjell Moberg | Director | 2005 - 2006 | 35 | |
| Michalsen, Hege, | Hege Michalsen | Director | 2010 | 1 | |
| Masumoto, Kiyoshi, | Kiyoshi Masumoto | Director | 1912 | 1 | |
| Myron, J., | J. Myron | Director | 1921 | 1 | |
| McConnell, Frederic, | Frederic McConnell | Director | 1922 - 1930 | 3 | |
| Miller, Jonathan | Jonathan Miller | Director | 1974 | 1 | |
| metscheva, Liljana | Liljana Metscheva | Director | 1974 | 1 | |
| Mackey, Karl | Karl Mackey | Director | 1973 | 1 | |
| Mervild, Kaj | Kaj Mervild | Director | 1928 | 1 | |
| Marshall, T. H. | T. H. Marshall | Director | 1928 | 1 | |
| Moulios, Giorgos | Giorgos Moulios | Director | 1977 | 1 | |
| Michaelsen, Ingrid Elise | Ingrid Elise Michaelsen | Director | 1978 | 1 | |
| Min, Zhan | Zhan Min | Director | 2006 - 2010 | 7 | |
| Mardžanov, Konstantin | Konstantin Mardžanov | Director | 1912 | 1 | |
| Menegatti, Beppe | Beppe Menegatti | Director | 1974 - 2007 | 7 | |
| Millerd, Bill | Bill Millerd | Director | 1978 | 1 | |
| Meißner, Johannes | Johannes Meißner | Director | 1897 | 1 | |
| Meacham, Michael | Michael Meacham | Director | 1975 - 1979 | 2 | |
| Michailidis, Kostis | Kostis Michailidis | Director | 1946 - 1980 | 9 | |
| McNern, Samantha | Samantha McNern | Director | 2013 | 1 | |
| Morahan, Christopher | Christopher Morahan | Director | 1958 - 1979 | 3 | |
| Meinholtz, Rolland | Rolland Meinholtz | Director | 1972 | 1 | |
| Moreno, Angel García | Angel García Moreno | Director | 1981 | 1 | |
| Morera, José María | José María Morera | Director | 1983 | 1 | |
| Mrsán, János | János Mrsán | Director | 1983 | 1 | |
| Moskowicz, Imo | Imo Moskowicz | Director | 1965 | 1 | |
| Marlette, Don | Don Marlette | Director | 1978 | 1 | |
| McFarland, Charles | Charles McFarland | Director | 1987 | 1 | |
| Mokrowiecki , Marek | Marek Mokrowiecki | Director | 1983 | 1 | |
| Morand, Philippe | Philippe Morand | Director | 1993 | 13 | |
| Metodiev, Stefan | Stefan Metodiev | Director | 1994 | 1 | |
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