| Mabou Mines | Mabou Mines | 2003 – 2011 | 35 | |
| Mad Child Productions | Mad Child Productions | 2025 | 1 | |
| Maddermarket Theatre Company | Maddermarket Theatre Company | 2000 – 2002 | 2 | |
| Madison Repertory Theatre | Madison Repertory Theatre | 1999 | 1 | |
| Magadan State Musical and Drama Theatre | Magadan State Musical and Drama Theatre | 2024 – 2025 | 1 | |
| Maison de la culture d’Amiens | Maison de la culture d’Amiens | 2013 – 2014 | 25 | |
| Makedonski, Naroden, Teatar | Makedonski naroden teatar | 1922 – 1934 | 11 | |
| Makhdoomi's Group | Makhdoomi's Group | 2006 | 1 | |
| Maleny Playhouse | Maleny Playhouse | 2024 | 1 | |
| Malmö City Theatre | Malmö City Theatre | 1951 | 1 | |
| Manhattan Company | Manhattan Company | 1904 – 1910 | 17 | |
| Marco Maltauro's Ensemle | Marco Maltauro's Ensemle | 1994 | 1 | |
| Mari-Film | Mari-Film | 1919 | 1 | |
| Mariinsky Theatre Chorus | Mariinsky Theatre Chorus | 2005 | 1 | |
| Mario Michelli | Mario Michelli | 2010 | 1 | |
| Marionetitlán | Marionetitlán | 2024 | 1 | |
| Marked for Scenekunst | Marked for Scenekunst | 2001 | 1 | |
| MarketStall | MarketStall | 2025 | 1 | |
| MARS Mons Arts de la Scène | MARS Mons Arts de la Scène | 2022 | 1 | |
| Mary Shaw Company | Mary Shaw Company | 1903 | 3 | |
| Maryland State Arts Council | Maryland State Arts Council | 2021 | 1 | |
| Mask and Dagger Club Washington State College, The | The Mask and Dagger Club Washington State College | 1916 | 1 | |
| Masquers | Masquers | 2003 | 1 | |
| Maurice Campbell's Company | Maurice Campbell's Company | 1905 | 3 | |
| Mauthner-Ensemble | Mauthner-Ensemble | 1894 | 1 | |
| Maxim Gorki Theater | Maxim Gorki Theater | 1967 – 2021 | 15 | |
| MC2 Grenoble | MC2 Grenoble | 2013 – 2014 | 25 | |
| Meadow Brook Theatre | Meadow Brook Theatre | 1972 | 1 | |
| Mecklenburgisches Staatstheater Schwerin | Mecklenburgisches Staatstheater Schwerin | 1994 – 2005 | 4 | |
| Meininger Hofkapelle | Meininger Hofkapelle (Meiningen Court Orchestra) | 2024 | 1 | |
| Meininger Musikverein | Meininger Musikverein | 1920 | 1 | |
| Melafestivalen | Melafestivalen | 2012 | 1 | |
| Melbourne City Council | Melbourne City Council | 1970 – 1980 | 3 | |
| Melbourne Festival | Melbourne Festival | 2011 – 2012 | 2 | |
| Melbourne Fringe Festival | Melbourne Fringe Festival | 2011 | 1 | |
| Melbourne Theatre Company | Melbourne Theatre Company | 1970 – 1998 | 15 | |
| Meßthaler-Ensemble vom Neuen Deutschen Theater München, Das | Das Meßthaler-Ensemble vom Neuen Deutschen Theater München | 1895 | 1 | |
| Městské divadlo v Táboře | Městské divadlo v Táboře | 1924 | 1 | |
| Metropolitan Players, The | The Metropolitan Players | 1912 – 1913 | 3 | |
| Mezinárodní festival Divadlo | Mezinárodní festival Divadlo | 2007 | 1 | |
| MGA Productions Limited | MGA Productions Limited | 1939 | 1 | |
| Michael Grandage Company | Michael Grandage Company | 2025 | 1 | |
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