| Menéndez, Gerardo | Gerardo Menéndez | Musical Director | 1978 | 1 | |
| Maldonado, José Antonio | José Antonio Maldonado | Sound Designer | 1978 | 1 | |
| Muro, Pilar S. | Pilar S. Muro | Costume Designer | 1968 - 1969 | 2 | |
| Montero, Matías | Matías Montero | Costume Designer | 1968 | 1 | |
| Masulli, Alberto | Alberto Masulli | Choreographer | 1968 | 1 | |
| Molina, Romualdo | Romualdo Molina | Adaptation | 1971 | 1 | |
| Manrique, José Luis | José Luis Manrique | Actor | 1974 | 1 | |
| Mutiševa, Lora | Lora Mutiševa (Лора Мутишева) | Actor | 2022 | 1 | |
| Milčev, Michail | Michail Milčev (Михаил Милчев) | Actor | 2022 | 1 | |
| Moreno, Matilde | Matilde Moreno | Actor | 1982 | 1 | |
| Moragas, Miquel | Miquel Moragas | Set Designer | 1903 - 1906 | 2 | |
| Macol, Elka | Elka Macol (Елка Мацол) | Actor | 1938 | 1 | |
| McDonald, Keegan | Keegan McDonald | Actor | 2015 | 1 | |
| Meregalli, Andrea | Andrea Meregalli | Translator | 2022 | 1 | |
| Mungiguerra, Piera | Piera Mungiguerra | Dramaturg | 2022 | 1 | |
| Mazzarino, Giulia | Giulia Mazzarino | Actor | 2022 | 1 | |
| Mercier, Skip | Skip Mercier | Set Designer | 2018 | 1 | |
| Mancarella, Philip | Philip Mancarella | Musician | 2022 | 1 | |
| Melo, João | João Melo | Actor | 2021 | 1 | |
| Molgosa, Mrs. | Mrs. Molgosa | Actor | 1907 | 1 | |
| Mr. Bové | Mr. Bové | Actor | 1913 | 1 | |
| Munt, Mr. | Mr. Munt | Actor | 1913 | 1 | |
| Mentes, Júlia | Júlia Mentes | Actor | 2023 | 2 | |
| Mundet, Agustín | Agustín Mundet | Translator | 1918 - 1925 | 7 | |
| Morano, Francisco | Francisco Morano | Actor | 1920 | 1 | |
| Marsal, Mrs. | Mrs. Marsal | Actor | 1922 | 1 | |
| Moragas, Carmen | Carmen Moragas | Actor | 1923 | 1 | |
| Morales, Mercedes | Mercedes Morales | Actor | 1925 | 1 | |
| Martínez, Gregorio | Gregorio Martínez | Actor | 1938 | 1 | |
| Mays, Devan | Devan Mays | Actor | 2022 | 1 | |
| Morgenstern, Christian | Christian Morgenstern (Christian Morgenstern) | Translator | 1899 - 2021 | 389 | 1 |
| Mannheim, Lucie | Lucie Mannheim (Lucie Mannheim) | Actor, Producer | 1928 - 1948 | 5 | 1 |
| Maria, Lucia | Lucia Maria (Lucia Maria) | Actor | 2007 - 2008 | 6 | 1 |
| Marquard-Olsen, Urania | Urania Marquard-Olsen (Urania Marquard-Olsen) | Actor | 1883 - 1924 | 58 | 1 |
| Mbewe, Mbumba | Mbumba Mbewe (Mbumba Mbewe) | Actor | 2006 | 23 | 1 |
| Miceli, David | David Miceli (David Miceli) | Actor | 2006 | 1 | 1 |
| Michael, Peter | Peter Michael (Peter Michael) | Actor | 2007 - 2011 | 7 | 1 |
| Mislin, Marcus | Marcus Mislin (Marcus Mislin) | Actor, Director | 1987 - 2013 | 7 | 1 |
| Modrzejewska, Helena | Helena Modrzejewska (Helena Modrzejewska) | Actor | 1882 - 1885 | 2 | 1 |
| Molander, Harald | Harald Molander (Harald Molander) | Actor, Director, Translator | 1885 - 1944 | 48 | 1 |
| Müller, Ludvig | Ludvig Müller (Ludvig Müller) | Actor, Director | 1897 - 1913 | 19 | 1 |
| Mærli, Terje | Terje Mærli (Terje Mærli) | Adaptation, Director, Producer | 1973 - 2007 | 221 | 1 |
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