| Moonie, William, B. | William B. Moonie | Conductor | 1924 | 1 | |
| Marie, Gabriel | Gabriel Marie | Conductor | 1896 | 1 | 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 | |
| Molenat, Yann | Yann Molenat | Conductor | 2023 | 1 | |
| Meena, Vimal | Vimal Meena (विमल मीणा) | Conductor | 2024 | 1 | |
| Maghini, Ruggero | Ruggero Maghini | Conductor | 1971 | 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 | 1 | |
| Mansos, Holly | Holly Mansos | Costume Designer | 2000 | 1 | |
| Martin, Janis | Janis Martin | Costume Designer | 2000 - 2011 | 20 | 3 |
| Martin, Mooch | Mooch Martin | Costume Designer | 1990 | 1 | |
| Matela, Kimberly | Kimberly Matela | Costume Designer | 2006 | 2 | |
| Mavromataki, Kelly | Kelly Mavromataki | Costume Designer | 2006 | 3 | |
| Meinhold, Reinhard | Reinhard Meinhold | Costume Designer | 1972 | 1 | |
| Merino, Juana | Juana Merino | Costume Designer | 1956 | 1 | |
| Messmer, Valérie | Valérie Messmer | Costume Designer | 2006 | 1 | |
| Mikkelsen, Johannes | Johannes Mikkelsen | Costume Designer | 2001 - 2004 | 5 | |
| Mirnik, Cveta | Cveta Mirnik | Costume Designer | 1979 - 1986 | 2 | |
| Mallickjoly, Wahida | Wahida Mallickjoly | Costume Designer | 1998 | 1 | |
| Mickelsen, David Kay | David Kay Mickelsen | Costume Designer | 2005 | 1 | |
| Mercurio, Maria Giovanna | Maria Giovanna Mercurio | Costume Designer | 1993 - 1994 | 2 | |
| Marra, Amy Di Lara | Amy Di Lara Marra | Costume Designer | 1995 | 1 | |
| Möser, Nicola | Nicola Möser | Costume Designer | 2005 | 4 | |
| Menichelli, Patrizia | Patrizia Menichelli | Costume Designer | 1990 | 1 | |
| Morigi, Alice Gealy | Alice Gealy Morigi | Costume Designer | 1973 | 1 | |
| Mushayiwedu, Memory | Memory Mushayiwedu | Costume Designer | 2010 | 1 | |
| Mauss, Brigitte | Brigitte Mauss | Costume Designer | 1956 - 1958 | 2 | |
| Medioli, Joanna M. | Joanna M. Medioli | Costume Designer | 1988 | 1 | |
| Morris, Patricia S. | Patricia S. Morris | Costume Designer | 2010 | 1 | |
| Maier, Anja | Anja Maier | Costume Designer | 2004 - 2006 | 4 | |
| Müller, Otto | Otto Müller | Costume Designer | 1932 | 1 | |
| Müller, Marie | Marie Müller | Costume Designer | 1932 | 1 | |
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