| Chemainus Theatre Festival | Chemainus Theatre Festival | 2007 | 1 | |
| Charter Chroniclers of Chronicle House, The | The Charter Chroniclers of Chronicle House | 1923 | 2 | |
| Cercle des Echoliers | Cercle des Echoliers | 1892 | 1 | |
| Century Players, The | The Century Players | 1904 | 1 | |
| Century Center for the Performing Arts | Century Center for the Performing Arts | 1998 – 2002 | 12 | |
| CentrStage | CentrStage | 2000 | 1 | |
| Centro Teatrale Bresciano | Centro Teatrale Bresciano | 1980 – 2025 | 26 | 1 |
| Centro Produzione Teatrale Nuovo Politecnico di Roma | Centro Produzione Teatrale Nuovo Politecnico di Roma | 1993 – 1994 | 2 | |
| Centro di Ricerca per il Teatro | Centro di Ricerca per il Teatro | 2006 – 2007 | 3 | |
| Centro di produzione Rai di Torino | Centro di produzione Rai di Torino | 1993 | 1 | 1 |
| Centro Danza e Movimento | Centro Danza e Movimento | 2009 | 1 | |
| Centro Culturale di Teatro | Centro Culturale di Teatro | 2009 | 1 | |
| Centro Cultural Vila Flor | Centro Cultural Vila Flor | 2007 – 2008 | 6 | |
| Centre Fraternal de Cultura | Centre Fraternal de Cultura | 1903 | 2 | |
| Centre For Asian Theatre | Centre For Asian Theatre | 1996 – 2008 | 12 | |
| Centre Dramatique National d'Aubervilliers | Centre Dramatique National d'Aubervilliers | 1987 – 2004 | 5 | |
| Centre de Recherche et d’Expérimentation en Pédagogie Artistique | Centre de Recherche et d’Expérimentation en Pédagogie Artistique | 2008 | 1 | |
| Centralteatret | Centralteatret | 1902 | 25 | |
| Ceļojoša teātris | Ceļojoša teātris | 1923 | 1 | |
| cell, the | the cell | 2015 | 2 | |
| CCR Centro Uno | CCR Centro Uno | 1982 | 3 | |
| Cavaliere Peypoch | Cavaliere Peypoch | 1909 | 2 | |
| Cassiopeia | Cassiopeia | 2007 – 2008 | 6 | |
| Casa de Teatro de Sintra | Casa de Teatro de Sintra | 2006 – 2007 | 2 | |
| Cartelera de Teatro | Cartelera de Teatro | 2024 | 2 | |
| Carolina Playmakers, The | The Carolina Playmakers | 1920 – 1957 | 5 | |
| Carlos Kroeber Produções Artísticas | Carlos Kroeber Produções Artísticas | 1971 | 5 | |
| Carlins, Els | Els Carlins (The Pugs) | 2025 | 1 | |
| Carl Otto Lindmarks sällskap | Carl Otto Lindmarks sällskap | 1876 – 1880 | 16 | |
| Cardinal Stritch University | Cardinal Stritch University | 1997 | 1 | |
| Canberra Theatre Trust | Canberra Theatre Trust | 1970 | 1 | |
| Canberra Repertory Society | Canberra Repertory Theatre (Canberra Repertory Society) | 1953 – 2019 | 6 | |
| Campbell Young Associates | Campbell Young Associates | 2024 | 1 | |
| Câmara Municipal | Câmara Municipal da Figueira da Foz | 2020 | 2 | |
| California State University, Chico's Department of Theatre | California State University, Chico's Department of Theatre | 2011 | 1 | |
| Caja Negra, La | La Caja Negra (The Black Box) | 2024 | 3 | |
| CafeTeatret | CafeTeatret | | | |
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