| Chester Theatre Group | Chester Theatre Group | 2002 | 1 | |
| Chiaroscuro Productions | Chiaroscuro Productions | 2002 | 1 | |
| Chicago Conservatory of Music and Dramatic Art | Chicago Conservatory of Music and Dramatic Art | 1895 | 1 | |
| China National Experimental Theatre (CNET) | China National Experimental Theatre (CNET) | 1998 – 2006 | 3 | |
| China University of Mining and Technology | China University of Mining and Technology | 2010 | 1 | |
| Chiswick Drama Circle | Chiswick Drama Circle | 1956 | 1 | |
| Chongqing Drama Society | Chongqing Drama Society | 1941 | 2 | |
| Chosun Actors School | Chosun Actors School | 1925 | 1 | |
| Chr. W. Foghts Teaterselskab | Chr. W. Foghts Teaterselskab | | | |
| Christian Wilhelm Foght Teaterselskab | Wilhelm Foght Teaterselskab (Christian Wilhelm Foght Teaterselskab) | 1878 – 1880 | 12 | |
| Christiania Folketheater | Christiania Folketheater | 1880 | 2 | |
| Christliche Landesbühne Mittelrhein | Christliche Landesbühne Mittelrhein | 1961 | 1 | |
| Chronic'Théâtre | Chronic'Théâtre | 2007 | 1 | |
| Cía. Cómico Dramática Mercedes Navarro y Julio Taboada | Cía. Cómico Dramática Mercedes Navarro y Julio Taboada | 1916 | 1 | |
| Cía. Dramática Española Miguel Muñoz | Cía. Dramática Española Miguel Muñoz | | | |
| Cía. Dramática Italiana de Andrea Maggi | Cía. Dramática Italiana de Andrea Maggi | 1896 | 1 | |
| Cía. Dramática Italiana Ruggeri-Borelli | Cía. Dramática Italiana Ruggeri-Borelli | 1909 | 1 | |
| Cía. Dramática Italiana Teresa Mariani | Cía. Dramática Italiana Teresa Mariani | 1904 | 1 | |
| Cidade de São Paulo Cultura | Cidade de São Paulo Cultura (São Paulo Municipal Department of Culture) | 2024 | 3 | |
| Civica Scuola di Teatro Paolo Grassi | Civica Scuola di Teatro Paolo Grassi | 2018 | 4 | 2 |
| Clarion Dramatic Club | Clarion Dramatic Club | 1916 | 1 | |
| Cleveland Play House | Cleveland Play House | 1929 – 1971 | 8 | |
| CMU Department of Theatre and Dance | CMU Department of Theatre and Dance | 2025 | 1 | |
| Coal Mine Theatre | Coal Mine Theatre | 2024 | 1 | |
| Coletivo de Mulheres Rosa Luxemburgo | Coletivo de Mulheres Rosa Luxemburgo (Rosa Luxemburgo Women's Collective) | 2024 | 1 | |
| Coletivo Gompa | Coletivo Gompa | 2023 – 2025 | 4 | |
| Collectif Io | Collectif Io | 2023 | 1 | |
| Colombine Teaterförlag | Colombine Teaterförlag | 2025 | 1 | |
| Comedia Nacional | Comedia Nacional | 1954 – 2019 | 6 | |
| Comédie de Lyon | Comédie de Lyon | 1980 | 1 | |
| Comédie de Rennes, La | La Comédie de Rennes | 1982 | 1 | |
| Comédie de Valence-Cdn Drôme-Ardèche | Comédie de Valence-Cdn Drôme-Ardèche | 2022 | 1 | |
| Comitato Teatro Treviso | Comitato Teatro Treviso | 2024 – 2025 | 2 | |
| Commediens Tropicales, Les | Les Commediens Tropicales | 2011 | 1 | |
| Commonweal Theatre Company | Commonweal Theatre Company | 1998 – 2017 | 48 | |
| Commonwealth Savings/Trading Bank of Australia, The | The Commonwealth Savings/Trading Bank of Australia | 1976 | 1 | |
| Community Theater | Community Theater | 2024 | 1 | |
| Compagnia Adolfo Colonnello | Compagnia Adolfo Colonnello | 1893 | 2 | |
| Compagnia Alessandro Marchetti | Compagnia Alessandro Marchetti | 1893 | 1 | |
| Compagnia Alfredo Campioni | Compagnia Alfredo Campioni | 1892 | 3 | |
| Compagnia Alfredo De Sanctis | Compagnia Alfredo De Sanctis | 1900 – 1923 | 19 | |
| Compagnia Alida Valli | Compagnia Alida Valli | 1956 | 2 | |
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