| Company OnStage | Company OnStage | 2005 | 2 | 2 |
| Company of Ten | Company of Ten | 2006 – 2013 | 2 | 1 |
| Compagnia Emilia Aliprandi Pieri | Compagnia Emilia Aliprandi Pieri | 1889 – 1895 | 5 | |
| Comedia Nacional | Comedia Nacional | 1954 – 2019 | 6 | |
| Compagnia Vitaliani | Compagnia Vitaliani | 1893 | 4 | |
| Compagnia Gustavo Salvini | Compagnia Gustavo Salvini | 1913 | 2 | |
| Chester Theatre Group | Chester Theatre Group | 2002 | 1 | |
| Criterion Independent Theatre | Criterion Independent Theatre | 1897 | 1 | |
| Collectif Io | Collectif Io | 2023 | 1 | |
| Chiswick Drama Circle | Chiswick Drama Circle | 1956 | 1 | |
| Compagnia Giovanni Emanuel Gatti | Compagnia Giovanni Emanuel Gatti | 1907 | 2 | |
| Chiaroscuro Productions | Chiaroscuro Productions | 2002 | 1 | |
| Court Theatre | Court Theatre | 1981 – 2022 | 3 | |
| Chemainus Theatre Festival | Chemainus Theatre Festival | 2007 | 1 | |
| Compagnia Paladini-Talli | Compagnia Paladini-Talli | 1893 | 2 | |
| Cutty Sark Tall Ships’ Race | Cutty Sark Tall Ships’ Race | 2001 | 1 | |
| Commonweal Theatre Company | Commonweal Theatre Company | 1998 – 2017 | 48 | |
| Compagnia Ermete Zacconi | Compagnia Ermete Zacconi | 1897 | 16 | |
| Cavaliere Peypoch | Cavaliere Peypoch | 1909 | 2 | |
| Creative Arts Center | Creative Arts Center | 1975 | 1 | |
| Cía. Dramática Italiana Teresa Mariani | Cía. Dramática Italiana Teresa Mariani | 1904 | 1 | |
| Chr. W. Foghts Teaterselskab | Chr. W. Foghts Teaterselskab | | | |
| Compagnia Grisanti-Micheluzzi | Compagnia Grisanti-Micheluzzi | 1892 | 3 | |
| Compagnia Fantechi | Compagnia Fantechi | 1895 | 1 | |
| cell, the | the cell | 2015 | 2 | |
| Compagnie La Nuit et le Moment Théâtre | Compagnie La Nuit et le Moment Théâtre | 2003 | 2 | |
| Compagnia Franza | Compagnia Franza | 1903 | 1 | |
| CT2 TV | CT2 TV | 2005 | 1 | |
| Cassiopeia | Cassiopeia | 2007 – 2008 | 6 | |
| Compagnia Vitaliani-Salsilli | Compagnia Vitaliani-Salsilli | 1892 | 10 | |
| Compagnia del Teatro Out Off | Compagnia del Teatro Out Off | 2000 – 2002 | 8 | |
| Compagnia Lombardi-Pavoni | Compagnia Lombardi-Pavoni | 1894 | 1 | |
| Compañía de Palencia-Tubau | Compañía de Palencia-Tubau | 1903 | 1 | |
| Chronic'Théâtre | Chronic'Théâtre | 2007 | 1 | |
| Chemnitzer Volksbühne | Chemnitzer Volksbühne | 1930 | 1 | |
| Compagnia Emma Gramatica / Memo Benassi | Compagnia Emma Gramatica / Memo Benassi | | | |
| Centro di Ricerca per il Teatro | Centro di Ricerca per il Teatro | 2006 – 2007 | 3 | |
| Carl Otto Lindmarks sällskap | Carl Otto Lindmarks sällskap | 1876 – 1880 | 16 | |
| Clarion Dramatic Club | Clarion Dramatic Club | 1916 | 1 | |
| Compagnia Giovanni Emanuel | Compagnia Giovanni Emanuel | 1894 | 5 | |
| Compagnia Annibale Ninchi | Compagnia Annibale Ninchi | 1922 – 1926 | 2 | |
| Carolina Playmakers, The | The Carolina Playmakers | 1920 – 1957 | 5 | |
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