| 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 | |
| Molde, Lisbeth | Lisbeth Molde | Costume Designer | 1981 | 1 | |
| Melková, Adela | Adela Melková | Costume Designer | 1972 | 1 | |
| Mügge, Vera | Vera Mügge | Costume Designer | 1965 | 1 | |
| Mellbye, Nathalie | Nathalie Mellbye | Costume Designer | | 1 | |
| Mladenović, Selena | Selena Mladenović | Costume Designer | 2021 | 1 | |
| Mack-Shafer, Irene | Irene Mack-Shafer | Costume Designer | 2022 | 1 | |
| Mcleod, Von | Von Mcleod | Costume Designer | 2022 | 1 | |
| Macomber, Amanda | Amanda Macomber | Costume Designer | 2022 | 1 | |
| Mathews, Daniele Tyler | Daniele Tyler Mathews | Costume Designer | 2022 | 1 | |
| Micevski, Blagoj | Blagoj Micevski (Благој Мицевски) | Costume Designer | 2013 | 1 | |
| Mikulić, Ana | Ana Mikulić | Costume Designer | | 1 | |
| Muro, Pilar S. | Pilar S. Muro | Costume Designer | 1968 - 1969 | 2 | |
| Montero, Matías | Matías Montero | Costume Designer | 1968 | 1 | |
| Marei, Ahmed | Ahmed Marei | Costume Designer | 2023 | 1 | |
| Masi, Giada | Giada Masi | Costume Designer | 2023 | 1 | |
| Moreau, Benjamin | Benjamin Moreau | Costume Designer | 2023 - 2024 | 9 | |
| Meucci, Eva | Eva Meucci | Costume Designer | 2013 | 1 | |
| Mullins, Bethany | Bethany Mullins | Costume Designer | 2019 | 1 | |
| Makovkin, Summer | Summer Makovkin | Costume Designer | 2019 | 1 | |
| Moore, Rebecca | Rebecca Moore | Costume Designer | 2024 | 1 | |
| 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 | |
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