| Mishra, Sarita | Sarita Mishra | Composer | 2006 - 2009 | 2 | |
| Mathis, Christian | Christian Mathis | Composer | 2009 - 2010 | 3 | 1 |
| Mohr, Matthias | Matthias Mohr | Composer | 2009 | 2 | |
| MacLeod, Kevin | Kevin MacLeod | Composer | 2009 | 1 | |
| McKelvey, Michael | Michael McKelvey | Composer | 2010 | 1 | |
| McGuire, Louis | Louis McGuire | Composer | 2009 | 1 | |
| Majumdar, Porimal | Porimal Majumdar | Composer | 2009 | 1 | |
| Müller, Tom | Tom Müller | Composer | 2011 | 2 | |
| Manolidou, Tatiana | Tatiana Manolidou | Composer | 2012 | 1 | |
| Maattola, Almos | Almos Maattola | Composer | 1964 | 1 | |
| Myers, Anne | Anne Myers | Composer | 1964 | 1 | |
| Mahavir, Abhay, Sharma | Abhay Sharma Mahavir | Composer | 2012 | 1 | |
| Marilier, François | François Marilier | Composer | 2011 | 1 | |
| Matisz, Flóra | Flóra Matisz | Composer | 2016 - 2023 | 4 | |
| Meriläinen, Usko | Usko Meriläinen | Composer | 1957 | 1 | |
| Maccagno, Stefano | Stefano Maccagno | Composer | 1998 | 1 | |
| Marolt, Mario | Mario Marolt | Composer | 1998 | 1 | |
| Mankovecký, Peter | Peter Mankovecký | Composer | 1998 | 1 | |
| Mélan-Gúéroult, - | - Mélan-Gúéroult | Composer | 1949 | 1 | |
| Mas, Jean-Pierre | Jean-Pierre Mas | Composer | 1976 | 1 | |
| McKoy, Butch | Butch McKoy | Composer | 2018 - 2021 | 20 | |
| Magee, Rusty | Rusty Magee | Composer | 1981 | 1 | 1 |
| Moutsinas, Lefteris | Lefteris Moutsinas | Composer | 2016 - 2017 | 2 | |
| Munzer-Dorn, Markus | Markus Munzer-Dorn | Composer | 1993 | 1 | |
| Moran, Robert | Robert Moran | Composer | 1994 | 1 | |
| Mendelsohn, Carol | Carol Mendelsohn | Composer | 1885 | 1 | |
| Makedonski, Konstantin | Konstantin Makedonski | Composer | 2001 | 1 | |
| Makedonski, Iskra | Iskra Makedonski | Composer | 2001 | 1 | |
| Mladenović, Boris | Boris Mladenović | Composer | 2016 | 1 | |
| Miličević, Willem | Willem Miličević | Composer | 2016 | 1 | |
| Mählby, Pelle | Pelle Mählby | Composer | 2020 | 1 | |
| Mrkša, Karlo | Karlo Mrkša | Composer | 2021 | 1 | |
| Miller, Doug | Doug Miller | Composer | 2006 | 1 | |
| Moe, Guro Skumsnes | Guro Skumsnes Moe | Composer | 2023 - 2024 | 9 | |
| Meyers, Emerson | Emerson Meyers | Composer, Conductor | 1965 | 2 | |
| Mihály, András | András Mihály | Composer, Conductor | 1990 | 2 | |
| Meissner, Hjalmar | Hjalmar Meissner | Composer, Conductor, Musical Director | 1889 - 1919 | 6 | |
| Miler, Eduard | Eduard Miler | Composer, Costume Designer, Director | 2004 - 2015 | 7 | 1 |
| Michaïlidis, Giorgos | Giorgos Michaïlidis | Composer, Director | 1984 - 1985 | 4 | |
| Müller, Gert | Gert Müller | Composer, Dramaturg | 1981 - 1996 | 3 | |
| Mankovecký, Róbert | Róbert Mankovecký | Composer, Dramaturg | 1993 | 2 | |
| McCarthy, Michael | Michael McCarthy | Composer, Dramaturg | 2012 - 2020 | 3 | 1 |
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