| Canberra Repertory Society | Canberra Repertory Society | Australia, Canberra | 1975-07-10 | 2019-03-02 | 1975–2019 | 2 | |
| Castillo de Doña Berenguela | Castillo de Doña Berenguela | Spain, Bolaños de Calatrava | 1975-07- | -- | 1975 | 1 | |
| Centre d'Etudes Théâtrales | Centre d'Etudes Théâtrales | Belgium, Louvain-la-Neuve, 1348 Ottignies | 1975-- | -- | 1975 | 1 | |
| Court House Theatre | Court House Theatre | Canada, Niagara-on-the-Lake, 26 Queen Street | 1974-06-27 | 2012-09-29 | 1974–2012 | 5 | |
| CSC Repertory Theatre | CSC Repertory Theatre | United States of America, New York, 136 East 13th Street | 1974-02-14 | 1978-04-02 | 1974–1985 | 3 | |
| Comédie de Caen - Théâtre des Cordes | Comédie de Caen - Théâtre des Cordes | France, 32 rue des Cordes, Caen | 1973-10-16 | 2013-04-18 | 1973–2013 | 3 | |
| Comedy Theatre | Comedy Theatre | Australia, Melbourne, 240 Exhibition Street | 1973-09-12 | 1973-10-06 | 1973 | 1 | |
| Circle Theater Company | Circle Theater Company | United States of America, Manhattan, Broadway and 83rd street | 1973-04-15 | -- | 1973 | 1 | |
| Colonnade Theatre | Colonnade Theatre | Canada, Toronto | 1972-10-30 | -- | 1972 | 1 | |
| Clark Center for the Performing Arts | Clark Center for the Performing Arts | United States of America, Arroyo Grande, 487 Fair Oaks Avenue | 1972-09-30 | 1972-10-09 | 1972 | 1 | |
| Château de Noirmoutier | Château de Noirmoutier | France, Noirmoutier-en-l'Île, Place d'Armes | 1972-07-17 | 1972-08-06 | 1972 | 1 | |
| Citadel Theatre | Citadel Theatre | Canada, Edmonton | 1972-03-22 | 1996-10-06 | 1972–1996 | 3 | |
| Cellar Stage Theater | Cellar Stage Theater | United States of America, Northfield | 1972-02-11 | 1972-02-19 | 1972 | 1 | |
| Cambridge Theatre | Cambridge Theatre | England, London, Earlham St | 1970-06-29 | -- | 1970–1982 | 2 | |
| Citizen's Theatre | Citizen's Theatre | Scotland, Glasgow, 119 Gorbals Street | 1970-06-03 | 2009-05-30 | 1970–2009 | 5 | |
| Canberra Theatre Centre | Canberra Theatre Centre | Australia, Canberra, Civic Square, London Circuit | 1970-05-14 | 2007-05-26 | 1970–2007 | 4 | |
| Chichester Festival Theatre | Chichester Festival Theatre | England, Chichester, A286 | 1970-05-13 | 2016-05-21 | 1970–2016 | 3 | |
| Close Theatre Club | Close Theatre Club | Scotland, Glasgow | 1968-09-25 | 1968-10-13 | 1968 | 1 | |
| Canale 2 | Canale 2 | Italy, Altamura (BA), Via Giovanni Bovio 1, 70022 Altamura (BA) | 1967-05-24 | -- | 1967–1970 | 2 | |
| Casa del Marino | Casa del Marino | Spain, Palmas de Gran Canaria | 1966-02-03 | -- | 1966 | 1 | |
| Cincinnati Playhouse in the Park | Cincinnati Playhouse in the Park | United States of America, Cincinnati, Mount Adams Circle | 1965-04-07 | -- | 1965 | 1 | |
| Curran Theatre | Curran Theatre | United States of America, San Francisco, 445 Geary St | 1965-01-04 | 1965-01-23 | 1965 | 1 | |
| Československá televize, Studio Praha | Československá televize, Studio Praha | Czech Republic, Prague | 1964-10-28 | 1994-05-04 | 1964–2000 | 13 | |
| Colegio Mayor Francisco Franco | Colegio Mayor Francisco Franco | Spain, Madrid, Avenida Seneca 12, Madrid | 1963-10-28 | -- | 1963 | 1 | |
| Colden Center, Queens College of The City University of New York | Colden Center, Queens College of The City University of New York | United States of America, Flushing, 65-30 Kissena Boulevard | 1963-07-19 | 1963-07-27 | 1963 | 1 | |
| Carlisle Foyer, Alumni Hall, Springfield College Campus | Carlisle Foyer, Alumni Hall, Springfield College Campus | United States of America, Springfield, 263 Alden Street | 1963-07-16 | 1963-07-20 | 1963 | 1 | |
| College Theatre, San Jose State College | College Theatre, San Jose State College | United States of America, San Jose, 1 Washington Sq | 1963-03-22 | 1963-03-30 | 1963 | 1 | |
| College Hall, University of South Australia | College Hall, University of South Australia | Australia, Adelaide, University of South Australia | 1961-12-14 | 1961-12-15 | 1961 | 1 | |
| Circo Teatro Arena | Circo Teatro Arena | Argentina, Buenos Aires, Charcas 558 | 1961-- | -- | 1961 | 1 | |
| Comedy Theatre | Comedy Theatre | England, London, Panton Street | 1960-01-05 | 2001-07-14 | 1960–2001 | 2 | |
| Central Library Theatre | Central Library Theatre | Canada, Toronto | 1959-04-24 | -- | 1959 | 1 | |
| Crescent Theatre | The Crescent Theatre | England, Birmingham, Brindleyplace, Sheepcote St | 1959-04-11 | 2000-11-25 | 1959–2000 | 2 | |
| Czech Republic | Czech Republic | Czech Republic, Czech Republic | 1958-03-23 | -- | 1958 | 1 | |
| Calcutta | Calcutta | India, West Bengal | 1958-01-10 | 1958-06-11 | 1958 | 1 | |
| Casino | Casino | Netherlands, Den Bosch | 1956-11-19 | 1989-04-02 | 1956–1992 | 3 | |
| Centraal Theater | Centraal Theater | Netherlands, Amsterdam, Amstelstraat 14-18 | 1956-10-09 | -- | 1956–1957 | 2 | |
| Chiswick Town Hall | Chiswick Town Hall | England, London, Heathfield Terrace, Turnham Green, Chiswick | 1956-06-09 | -- | 1956 | 1 | |
| Československý rozhlas Brno | Československý rozhlas Brno | Czech Republic, Brno | 1956-05-10 | 2012-09-29 | 1956–1968 | 3 | |
| Comedia Nacional | Comedia Nacional | Uruguay, Montevideo, Ciudad Vieja | 1954-05-21 | -- | 1954–1994 | 3 | |
| Československý rozhlas Praha | Československý rozhlas Praha | Czech Republic, Prague | 1953-09-28 | 2012-10-06 | 1953–2012 | 3 | |
| Comédie Caumartin | Comédie Caumartin | France, Paris, 25 Rue de Caumartin | 1952-12-09 | -- | 1952–1991 | 2 | |
| Canada | Canada | Canada | 1952-10-16 | -- | 1952–1978 | 12 | |
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