| Mabou Mines | Mabou Mines | 2003 - 2011 | 34 | |
| Maddermarket Theatre Company | Maddermarket Theatre Company | 2000 - 2002 | 2 | |
| Madison Repertory Theatre | Madison Repertory Theatre | 1999 | 1 | |
| Maison de la culture d’Amiens | Maison de la culture d’Amiens | 2013 | 8 | |
| Makhdoomi's Group | Makhdoomi's Group | 2006 | 1 | |
| Malmö City Theatre | Malmö City Theatre | 1951 | 1 | |
| Manhattan Company | Manhattan Company | 1904 - 1910 | 17 | |
| Marco Maltauro's Enemle | Marco Maltauro's Enemle | 1994 | 1 | |
| Mari-Film | Mari-Film | 1919 | 1 | |
| Mariinsky Theatre Chorus | Mariinsky Theatre Chorus | 2005 | 1 | |
| Mario Michelli | Mario Michelli | 2010 | 1 | |
| Marked for Scenekunst | Marked for Scenekunst | 2001 | 1 | |
| Mary Shaw Company | Mary Shaw Company | 1903 | 3 | |
| 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 - 2012 | 14 | |
| MC2 Grenoble | MC2 Grenoble | 2013 | 8 | |
| Meadow Brook Theatre | Meadow Brook Theatre | 1972 | 1 | |
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