| Masso, José Luis | José Luis Masso | Director | 2015 | 1 | |
| Manrique, Julio | Julio Manrique | Director | 2017 - 2020 | 2 | |
| McDowell, W. Stuart | W. Stuart McDowell | Director | 2020 | 1 | |
| Manskij, David | David Manskij (Давид Манский) | Director | 1939 | 1 | |
| Michajlov, A. | A. Michajlov | Director | 1948 | 1 | |
| Massal'skij, Pavel | Pavel Massal'skij | Director | 1956 | 1 | |
| Meerskon, L. | L. Meerskon | Director | 1966 | 1 | |
| Mirkin, Ja. | Ja. Mirkin | Director | 1955 | 1 | |
| Marson, K. | K. Marson | Director | 1968 | 1 | |
| Merlo, Manuel | Manuel Merlo | Director | 2010 | 1 | |
| Mata Ramos, Andrés | Andrés Mata Ramos | Director | 2008 | 1 | |
| Magar, Taibi | Taibi Magar | Director | 2020 | 1 | |
| Maržanov, M. | M. Maržanov | Director | 1931 | 1 | |
| Melgosa, Fernando | Fernando Melgosa | Director | 1991 | 1 | |
| Manganari, Maria | Maria Manganari | Director | 2020 | 1 | |
| Mostafaei, Niloufar | Niloufar Mostafaei | Director | 2019 | 1 | |
| Moosavi, Rahim | Rahim Moosavi | Director | 2018 - 2020 | 2 | |
| Moschos, Giannis | Giannis Moschos | Director | 2020 | 1 | |
| Marzban, Hadi | Hadi Marzban | Director | 2006 | 1 | |
| Mobasheri, Maaneli | Maaneli Mobasheri | Director | 2019 | 1 | |
| Molander, Christer | Christer Molander | Director | 2011 | 1 | |
| Marston, Theodore | Theodore Marston | Director | 1911 | 1 | |
| Mitchell, Leon | Leon Mitchell | Director | 2020 | 1 | |
| Marie, Élisabeth | Élisabeth Marie | Director | 1991 | 1 | |
| Marin, François | François Marin | Director | 2018 | 3 | |
| Meigné, Benoît | Benoît Meigné (Meigne, Benoît) | Director | 2015 | 2 | |
| Melrose, Rob | Rob Melrose | Director | 2021 | 1 | |
| Michalik, Mariusz | Mariusz Michalik | Director | 2009 | 1 | |
| Marischka, Georg | Georg Marischka | Director | 1977 | 1 | |
| Missiroli , Mario | Mario Missiroli | Director | 1972 | 1 | |
| Medford, Don | Don Medford | Director | 1954 - 1959 | 2 | |
| More O'Ferrall, George | George More O'Ferrall | Director | 1957 | 1 | |
| Marks, Sherman | Sherman Marks | Director | 1957 | 1 | |
| Metzner, Ernö | Ernö Metzner | Director | 1933 | 1 | |
| Modestowicz, Waldemar | Waldemar Modestowicz | Director | 2006 | 1 | |
| Mandić Rigonat, Tatjana | Tatjana Mandić Rigonat | Director | 2021 | 1 | |
| Murphy, Joe | Joe Murphy | Director | 2022 | 1 | |
| Murray, Jake | Jake Murray | Director | 2022 | 10 | |
| Mario, Emilio | Emilio Mario | Director | 1896 | 1 | |
| Miralles, Carlos | Carlos Miralles | Director | 1938 | 1 | |
| Miró, Pau | Pau Miró | Director | 2015 - 2017 | 3 | |
| Maehler, Tobias | Tobias Maehler | Director | 2023 | 7 | |
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