| 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 | |
| Mills, Harold | Harold Mills | Conductor, Musical Director | 1914 - 1921 | 2 | |
| MacMillan, Ernest | Ernest MacMillan | Conductor, Musical Director | 1930 | 2 | |
| Magnusson, Erika | Erika Magnusson (Erika Magnusson) | Costume Designer | 2007 | 1 | |
| Mansos, Holly | Holly Mansos (Holly Mansos) | Costume Designer | 2000 | 1 | |
| Martin, Janis | Janis Martin (Janis Martin) | Costume Designer | 2000 - 2011 | 20 | 2 |
| Martin, Mooch | Mooch Martin (Mooch Martin) | Costume Designer | 1990 | 1 | |
| Matela, Kimberly | Kimberly Matela (Kimberly Matela) | Costume Designer | 2006 | 2 | |
| Mavromataki, Kelly | Kelly Mavromataki (Kelly Mavromataki) | Costume Designer | 2006 | 3 | |
| Meinhold, Reinhard | Reinhard Meinhold (Reinhard Meinhold) | Costume Designer | 1972 | 1 | |
| Merino, Juana | Juana Merino (Juana Merino) | Costume Designer | 1956 | 1 | |
| Messmer, Valérie | Valérie Messmer (Valérie Messmer) | Costume Designer | 2006 | 1 | |
| Mikkelsen, Johannes | Johannes Mikkelsen (Johannes Mikkelsen) | Costume Designer | 2001 - 2004 | 5 | |
| Mirnik, Cveta | Cveta Mirnik (Cveta Mirnik) | Costume Designer | 1979 - 1986 | 2 | |
| Mallickjoly, Wahida | Wahida Mallickjoly (Wahida Mallickjoly) | Costume Designer | 1998 | 1 | |
| Mickelsen, David Kay | David Kay Mickelsen (David Kay Mickelsen) | Costume Designer | 2005 | 1 | |
| Mercurio, Maria Giovanna | Maria Giovanna Mercurio (Maria Giovanna Mercurio) | Costume Designer | 1993 - 1994 | 2 | |
| Marra, Amy Di Lara | Amy Di Lara Marra (Amy Di Lara Marra) | Costume Designer | 1995 | 1 | |
| Möser, Nicola | Nicola Möser (Nicola Möser) | Costume Designer | 2005 | 4 | |
| Menichelli, Patrizia | Patrizia Menichelli (Patrizia Menichelli) | Costume Designer | 1990 | 1 | |
| Morigi, Alice Gealy | Alice Gealy Morigi (Alice Gealy Morigi) | Costume Designer | 1973 | 1 | |
| Mushayiwedu, Memory | Memory Mushayiwedu (Memory Mushayiwedu) | Costume Designer | 2010 | 1 | |
| Mauss, Brigitte | Brigitte Mauss (Brigitte Mauss) | Costume Designer | 1956 - 1958 | 2 | |
| Medioli, Joanna M. | Joanna M. Medioli (Joanna M. Medioli) | Costume Designer | 1988 | 1 | |
| Morris, Patricia S. | Patricia S. Morris (Patricia S. Morris) | Costume Designer | 2010 | 1 | |
| Maier, Anja | Anja Maier (Anja Maier) | Costume Designer | 2004 - 2006 | 4 | |
| Müller, Otto | Otto Müller (Otto Müller) | Costume Designer | 1932 | 1 | |
| Müller, Marie | Marie Müller (Marie Müller) | Costume Designer | 1932 | 1 | |
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