| McSweeney, Kevin | Kevin McSweeney | Director | 2001 | 2 | |
| Melldahl, Åsa | Åsa Melldahl | Director | 2000 - 2007 | 3 | 1 |
| Meltke, Martin | Martin Meltke | Director | 1981 | 1 | |
| Mentzel, Horst | Horst Mentzel | Director | 1975 | 1 | |
| Mercure, Jean | Jean Mercure | Director | 1952 | 1 | |
| Metcalfe, Edgar | Edgar Metcalfe | Director | 1970 | 3 | |
| Michaels, Stephen | Stephen Michaels | Director | 1991 | 1 | |
| Militaru, Sorin | Sorin Militaru | Director | 2006 | 2 | 1 |
| Mills, Liz | Liz Mills | Director | 1995 | 1 | 1 |
| Molitorisz, Manfred | Manfred Molitorisz | Director | 1980 | 1 | |
| Montgomery, Gary | Gary Montgomery | Director | 1974 | 1 | |
| Morelli, Richard | Richard Morelli | Director | 1949 - 1959 | 3 | |
| Moszkowicz, Imo | Imo Moszkowicz | Director | 1964 - 1965 | 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 | 1 |
| Macedonio, Francesco | Francesco Macedonio | Director | 1974 | 2 | |
| Min, Zhang | Zhang Min | Director | 1935 | 2 | |
| Merő, Béla | Béla Merő | Director | 2005 - 2010 | 2 | 1 |
| Mellies, Eberhard | Eberhard Mellies | Director | 1956 - 1958 | 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 | 1 |
| Munkwitz, Adolf | Adolf Munkwitz | Director | 1911 | 1 | |
| Meyer-Bruhns, Adolf | Adolf Meyer-Bruhns | Director | 1937 - 1938 | 2 | |
| Meltzer, Charles Henry | Charles Henry Meltzer | Director | 1900 | 1 | |
| Mandrovitsch, Adam | Adam Mandrovitsch | Director | 1901 | 1 | |
| Martyn, Edward | Edward Martyn | Director | 1903 - 1904 | 2 | 1 |
| Moore, George | George Moore | Director | 1903 - 1904 | 2 | 1 |
| Michaelson, Knut | Knut Michaelson | Director | 1908 | 1 | |
| Milton, Robert | Robert Milton | Director | 1910 | 2 | 1 |
| Murray, Braham | Braham Murray | Director | 1999 - 2001 | 2 | 1 |
| Mithassel, Reinert | Reinert Mithassel | Director | 1991 | 1 | 1 |
| Myhren, Dagne Groven | Dagne Groven Myhren | Director | 1994 - 1995 | 2 | 1 |
| 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 | |
| Monck, Nugent | Nugent Monck | Director | 1925 - 1928 | 3 | 1 |
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