| Meadow Brook Theatre | Meadow Brook Theatre | 1972 | 1 | |
| Magadan State Musical and Drama Theatre | Magadan State Musical and Drama Theatre | 2024 – 2025 | 1 | |
| Mingei (People's Theatre) | Mingei (People's Theatre) | 1953 – 2002 | 6 | |
| Münchener Künstler-Theater | Münchener Künstler-Theater | 1914 | 1 | |
| Modern Stage | Modern Stage | 1915 | 2 | |
| Mabou Mines | Mabou Mines | 2003 – 2011 | 35 | |
| Ministero della cultura (MiBACT) | Ministero della cultura (MiBACT) | 2024 – 2025 | 3 | |
| Mountain Empire Community Theatre, The | The Mountain Empire Community Theatre | 2007 | 1 | |
| MC2 Grenoble | MC2 Grenoble | 2013 – 2014 | 25 | |
| Molde Videregående skole | Molde Videregående skole | 2013 | 1 | |
| Mme Vera F Komisarzhevskaya Repertory | Mme Vera F Komisarzhevskaya Repertory | 1908 | 1 | |
| MIDI LIDI | MIDI LIDI | 2011 – 2012 | 3 | |
| Milwaukee Repertory Theater Company | Milwaukee Repertory Theater Company | 1971 – 2004 | 3 | |
| Münchener Ensemble (Direktion: Emil Meßthaler) | Münchener Ensemble (Direktion: Emil Meßthaler) | 1893 | 6 | |
| Musikk i Nordland | Musikk i Nordland | 2006 | 1 | |
| Monologtheater | Monologtheater | 2023 | 2 | |
| Moat Club, The | The Moat Club | 2007 | 7 | |
| Mauthner-Ensemble | Mauthner-Ensemble | 1894 | 1 | |
| Marked for Scenekunst | Marked for Scenekunst | 2001 | 1 | |
| Mutumbela Gogo | Mutumbela Gogo | 2006 – 2025 | 6 | |
| Mingei / Shochiku | Shochiku (Mingei / Shochiku) | 1986 | 1 | |
| MarketStall | MarketStall | 2025 | 1 | |
| Mari-Film | Mari-Film | 1919 | 1 | |
| Morosco Company, The | The Morosco Company | 1904 | 3 | |
| Madison Repertory Theatre | Madison Repertory Theatre | 1999 | 1 | |
| milwaukee chamber theatre | Milwaukee Chamber Theatre | 2025 | 1 | |
| Maastrichts Theaterensemble Het Vervolg | Maastrichts Theaterensemble Het Vervolg | 1997 | 1 | |
| Meininger Musikverein | Meininger Musikverein | 1920 | 1 | |
| Mask and Dagger Club Washington State College, The | The Mask and Dagger Club Washington State College | 1916 | 1 | |
| Maddermarket Theatre Company | Maddermarket Theatre Company | 2000 – 2002 | 2 | |
| Mofeng she (Windmill Society) | Mofeng she (Windmill Society) | 1935 | 1 | |
| Maison de la culture d’Amiens | Maison de la culture d’Amiens | 2013 – 2014 | 25 | |
| Münchner Hoftheater-Ensemble | Münchner Hoftheater-Ensemble | 1912 | 1 | |
| MGA Productions Limited | MGA Productions Limited | 1939 | 1 | |
| Marionetitlán | Marionetitlán | 2024 | 1 | |
| Maxim Gorki Theater | Maxim Gorki Theater | 1967 – 2021 | 15 | |
| Meßthaler-Ensemble vom Neuen Deutschen Theater München, Das | Das Meßthaler-Ensemble vom Neuen Deutschen Theater München | 1895 | 1 | |
| Mario Michelli | Mario Michelli | 2010 | 1 | |
| Minkul'tury RF | Minkul'tury RF (Ministry of Culture of the Russian Federation) | 2022 | 1 | |
| Mockingbird Theatre | Mockingbird Theatre | 2000 | 1 | |
| Makhdoomi's Group | Makhdoomi's Group | 2006 | 1 | |
| Mezinárodní festival Divadlo | Mezinárodní festival Divadlo | 2007 | 1 | |
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