| Mankovecký, Róbert | Róbert Mankovecký | Composer, Dramaturg | 1993 | 2 | |
| McCarthy, Michael | Michael McCarthy | Composer, Dramaturg | 2012 – 2020 | 3 | |
| Muscalu, Stelica | Stelica Muscalu | Composer, Musical Director | 2006 – 2010 | 2 | |
| Miljeteig, Sjur, | Sjur Miljeteig | Composer, Musician | 2011 – 2018 | 5 | |
| 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 | |
| Mazurkiewicz, Tadeusz | Tadeusz Mazurkiewicz | Conductor | 1917 | 1 | |
| Möckel, Thomas | Thomas Möckel | Conductor | 1994 | 1 | |
| Mazzagatti, Pacien | Pacien Mazzagatti | Conductor | 2005 | 1 | |
| Mikkelsen, Terje | Terje Mikkelsen | Conductor | 2014 | 4 | |
| Myers, Timothy | Timothy Myers | Conductor | 2006 | 1 | |
| Martin, Alexander | Alexander Martin | Conductor | 2008 | 1 | |
| Mees, Siegbert | Friedrich Siegbert Mees | Conductor | 1926 | 2 | |
| Michalski, Carl | Carl Michalski | Conductor | 1938 | 1 | |
| Meik, Siegfried | Siegfried Meik | Conductor | 1939 | 1 | |
| Masson, Louis | Louis Masson | Conductor | 1933 | 1 | |
| Mooser, Anton | Anton Mooser | Conductor | 1951 | 1 | |
| Menges, Herbert | Herbert Menges | Conductor | 1935 – 1945 | 3 | |
| Mitropoulos, Dimitris | Dimitris Mitropoulos | Conductor | 1935 | 1 | |
| Mechlenburg, Fritz | Fritz Mechlenburg | Conductor | 1940 | 1 | |
| Moro, Moreno | Moreno Moro | Conductor | 1978 | 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 – 1911 | 1 | |
| Manns, Ferdinand | Ferdinand Manns | Conductor | 1911 – 1912 | 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 | 1 | |
| Mills, Harold | Harold Mills | Conductor, Musical Director | 1914 – 1921 | 2 | |
| MacMillan, Ernest | Ernest MacMillan | Conductor, Musical Director | 1930 | 2 | |
| Magnusson, Erika | Erika Magnusson | Costume Designer | 2007 – 2008 | 1 | |
| Mansos, Holly | Holly Mansos | Costume Designer | 2000 | 1 | |
| Martin, Janis | Janis Martin | Costume Designer | 2000 – 2011 | 40 | 2 |
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