| Mingei (People's Theatre) | Mingei (People's Theatre) | 1953 – 2002 | 6 | |
| Malmö City Theatre | Malmö City Theatre | 1951 | 1 | |
| MGA Productions Limited | MGA Productions Limited | 1939 | 1 | |
| Mofeng she (Windmill Society) | Mofeng she (Windmill Society) | 1935 | 1 | |
| Městské divadlo v Táboře | Městské divadlo v Táboře | 1924 | 1 | |
| Makedonski, Naroden, Teatar | Makedonski naroden teatar | 1922 – 1934 | 11 | |
| Meininger Musikverein | Meininger Musikverein | 1920 | 1 | |
| Mari-Film | Mari-Film | 1919 | 1 | |
| Montreal Stage Society | Montreal Stage Society | 1918 | 1 | |
| Mask and Dagger Club Washington State College, The | The Mask and Dagger Club Washington State College | 1916 | 1 | |
| Modern Stage | Modern Stage | 1915 | 2 | |
| Münchener Künstler-Theater | Münchener Künstler-Theater | 1914 | 1 | |
| Metropolitan Players, The | The Metropolitan Players | 1912 – 1913 | 3 | |
| Münchner Hoftheater-Ensemble | Münchner Hoftheater-Ensemble | 1912 | 1 | |
| Mme Vera F Komisarzhevskaya Repertory | Mme Vera F Komisarzhevskaya Repertory | 1908 | 1 | |
| Maurice Campbell's Company | Maurice Campbell's Company | 1905 | 3 | |
| Moskva Kunstnerteater | Moskva Kunstnerteater | 1905 | 3 | |
| Manhattan Company | Manhattan Company | 1904 – 1910 | 17 | |
| Morosco Company, The | The Morosco Company | 1904 | 3 | |
| Mary Shaw Company | Mary Shaw Company | 1903 | 3 | |
| Moskovskij Hudožestvennyj akademičeskij teatr | Moskovskij Hudožestvennyj akademičeskij teatr (Moscow Art Theatre) | 1900 – 1924 | 7 | |
| Münchener Dramatische Gesellschaft | Münchener Dramatische Gesellschaft | 1900 | 2 | |
| Meßthaler-Ensemble vom Neuen Deutschen Theater München, Das | Das Meßthaler-Ensemble vom Neuen Deutschen Theater München | 1895 | 1 | |
| Mauthner-Ensemble | Mauthner-Ensemble | 1894 | 1 | |
| Münchener Ensemble (Direktion: Emil Meßthaler) | Münchener Ensemble (Direktion: Emil Meßthaler) | 1893 | 6 | |
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