| Morelli, Richard | Richard Morelli | Director | 1949 – 1959 | 3 | |
| Moszkowicz, Imo | Imo Moszkowicz | Director | 1964 | 4 | |
| Musgrove, Katherine | Katherine Musgrove | Director | 2004 | 1 | |
| Maoysz, Mieczysoaw | Mieczysoaw Maoysz | Director | 1970 | 1 | |
| Müller, W. | W. Müller | Director | 1998 | 1 | |
| Miller, Henry, | Henry Miller | Director | 1906 – 1907 | 5 | |
| Macedonio, Francesco, | Francesco Macedonio | Director | 1974 | 2 | |
| Min, Zhang | Zhang Min | Director | 1935 | 2 | |
| Malcolm, Grant | Grant Malcolm | Director | 2000 | 1 | |
| Merő, Béla | Béla Merő | Director | 2005 | 2 | |
| Mellies, Eberhard | Eberhard Mellies | Director | 1956 | 2 | |
| Moyo, Gankhanani | Gankhanani Moyo | Director | 2010 | 1 | |
| Maher, Chris | Chris Maher | Director | 2011 | 1 | |
| McGregor, Ross | Ross McGregor | Director | 2010 | 15 | |
| Meery, Hans, | Hans Meery | Director | 1889 – 1914 | 33 | |
| Munkwitz, Adolf, | Adolf Munkwitz | Director | 1911 – 1912 | 1 | |
| Meyer-Bruhns, Adolf, | Adolf Meyer-Bruhns | Director | 1937 | 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 | 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 | 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 | |
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