| Meyer, Jimmy | Jimmy Meyer | Costume Designer | 1971 | 1 | |
| Morrison, Kathleen | Kathleen Morrison | Costume Designer | 2017 | 1 | |
| Malatesta, Marta, Crisolini | Marta Crisolini Malatesta | Costume Designer | 2016 | 1 | |
| Mariani, Lucia | Lucia Mariani | Costume Designer | 2016 - 2018 | 42 | |
| Morrell, Ann | Ann Morrell | Costume Designer | 1977 | 1 | |
| Mantschenko-Feredzhanova, Darina | Darina Mantschenko-Feredzhanova | Costume Designer | 1980 | 1 | |
| Metzger, Christopher | Christopher Metzger | Costume Designer | 2017 | 1 | |
| Mazur, Leah | Leah Mazur | Costume Designer | 2015 | 1 | |
| Myers, Mary | Mary Myers | Costume Designer | 1993 | 1 | |
| Michaelis, Suzanne | Suzanne Michaelis | Costume Designer | 1997 | 1 | |
| Márton , Erika | Erika Márton | Costume Designer | 2018 | 2 | |
| Marquis, Marie-Claude | Marie-Claude Marquis | Costume Designer | 2018 | 1 | |
| Marras, Antonio | Antonio Marras | Costume Designer | 2018 | 1 | |
| Molina, Paula | Paula Molina | Costume Designer | 2018 | 1 | |
| Moran, Val | Val Moran | Costume Designer | 1975 | 1 | |
| Medert, Inge | Inge Medert | Costume Designer | 2015 | 1 | |
| Mednik, Moni | Moni Mednik | Costume Designer | 2016 | 1 | |
| Marth, Katharina | Katharina Marth | Costume Designer | 2019 | 1 | |
| Milán, Magalí | Magalí Milán | Costume Designer | 2019 | 1 | |
| Mihajlović, Darinka | Darinka Mihajlović | Costume Designer | 2013 | 1 | |
| Mirmohammadi, Shima | Shima Mirmohammadi | Costume Designer | 2015 | 1 | |
| Magnet-Jaffeux, Anne-Marie | Anne-Marie Magnet-Jaffeux | Costume Designer | 2019 | 1 | |
| Manipoud, Lara | Lara Manipoud | Costume Designer | 2018 | 1 | |
| Mladjenovic, Marko | Marko Mladjenovic | Costume Designer | 2018 | 1 | |
| Marchini, Bruno | Bruno Marchini | Costume Designer | 2014 - 2015 | 2 | |
| Munier, Karine | Karine Munier | Costume Designer | 2015 | 2 | |
| Mohammadi , Vahidéa | Vahidéa Mohammadi | Costume Designer | 2014 | 1 | |
| McGinley, Jen | Jen McGinley | Costume Designer | 2021 | 5 | |
| Moreno, Maria Angeles | Maria Angeles Moreno | Costume Designer | 2002 | 1 | |
| Møller, Winni | Winni Møller | Costume Designer | 2000 | 1 | |
| Maier-Peveling, Georg | Georg Maier-Peveling | Costume Designer | 2021 | 7 | |
| Mills, Harold | Harold Mills | Conductor, Musical Director | 1914 - 1921 | 2 | |
| MacMillan, Ernest | Ernest MacMillan | Conductor, Musical Director | 1930 | 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 - 2015 | 4 | |
| Myers, Timothy | Timothy Myers | Conductor | 2006 | 1 | |
| Martin, Alexander | Alexander Martin | Conductor | 2008 | 1 | |
| Mees, Siegbert | Friedrich Siegbert Mees | Conductor | 1926 - 1938 | 2 | |
| Michalski, Carl | Carl Michalski | Conductor | 1938 | 1 | |
| Meik, Siegfried | Siegfried Meik | Conductor | 1939 | 1 | |
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