| Masson, Louis | Louis Masson | Conductor | 1933 | 1 | |
| Mooser, Anton | Anton Mooser | Conductor | 1951 | 1 | |
| Menges, Herbert | Herbert Menges | Conductor | 1935 - 1944 | 3 | |
| Mitropoulos, Dimitris | Dimitris Mitropoulos | Conductor | 1935 | 1 | |
| Mechlenburg, Fritz | Fritz Mechlenburg | Conductor | 1940 | 1 | |
| Maresch, Jacques | Jacques Maresch | Conductor | 2017 | 2 | |
| Moro, Moreno | Moreno Moro | Conductor | 1978 - 1980 | 2 | |
| Marchand, Miguel, Patron | Miguel Patron Marchand | Conductor | 1986 | 1 | |
| Murray, J. Ainslie | J. Ainslie Murray | Conductor | 1908 | 1 | |
| Moonie, William, B. | William B. Moonie | Conductor | 1924 | 1 | |
| Marie, Gabriel | Gabriel Marie | Conductor | 1896 | 1 | |
| Muck, Carl | Karl Muck | Conductor | 1905 | 1 | |
| Maneja, Antoni Ribera | Antoni Ribera Maneja | Conductor | 1910 | 1 | |
| Manns, Ferdinand | Ferdinand Manns | Conductor | 1911 | 1 | |
| Malaka, Oscar | Oscar Malaka | Conductor | 1917 | 1 | |
| McLaren, C. | C. McLaren | Conductor | 1917 | 1 | |
| Mayer, Karl | Karl Mayer | Conductor | 1919 | 1 | |
| Merten, Bernh. | Bernh. Merten | Conductor | 1919 | 1 | |
| Meißner, Hoffkapellmester | Hoffkapellmester Meißner | Conductor | 1919 | 1 | |
| Mennerich, Adolf | Adolf Mennerich | Conductor | 1926 | 1 | |
| Masur, Ken-David | Ken-David Masur | Conductor | 2017 - 2022 | 2 | |
| McKenzie, Claire | Claire McKenzie | Composer, Sound Designer | 2015 | 2 | |
| Mills-Cockell, John | John Mills-Cockell | Composer, Sound Designer | 2002 | 2 | |
| Mandell, Ellen | Ellen Mandell | Composer, Sound Designer | 2004 | 2 | |
| Møller, Peter, Kohlmetz | Peter Kohlmetz Møller | Composer, Sound Designer | 2013 | 2 | |
| McCarthy, Jefferson | Jefferson McCarthy | Composer, Sound Designer | 2021 | 2 | |
| Miljeteig, Sjur, | Sjur Miljeteig | Composer, Musician | 2011 - 2018 | 5 | |
| Muscalu, Stelica | Stelica Muscalu | Composer, Musical Director | 2006 - 2009 | 2 | |
| 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 | |
| Michaïlidis, Giorgos | Giorgos Michaïlidis | Composer, Director | 1984 - 1985 | 4 | |
| Miler, Eduard | Eduard Miler | Composer, Costume Designer, Director | 2004 - 2015 | 7 | |
| Meissner, Hjalmar, | Hjalmar Meissner | Composer, Conductor, Musical Director | 1889 - 1919 | 6 | |
| Meyers, Emerson | Emerson Meyers | Composer, Conductor | 1965 | 2 | |
| Mihály, András | András Mihály | Composer, Conductor | 1990 | 2 | |
| Munkeby, Jørgen, | Jørgen Munkeby | Composer | 2006 - 2011 | 5 | |
| Molina, Nicolás Posse | Nicolás Posse Molina | Composer | 2001 | 1 | |
| Madin, Chris | Chris Madin | Composer | 1999 | 30 | |
| Maier-Waelde, Ingeborg | Ingeborg Maier-Waelde | Composer | 1969 | 1 | |
| Mandel, Ellen | Ellen Mandel | Composer | 1994 - 1997 | 2 | |
| Martinig, Aldo | Aldo Martinig | Composer | 1984 | 1 | |
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