| Cambridge | Cambridge | United States, Cambridge | 1950-04-11 | 1950-04-23 | 1950–1967 | 2 | |
| Cherry Lane Theatre | Cherry Lane Theatre | United States, New York, 38 Commerce St | 1950-05-25 | -- | 1950 | 1 | |
| Christchurch Studio Theatre | Christchurch Studio Theatre | England, London | 1951-03-06 | 1951-03-11 | 1951 | 1 | |
| Casino | Casino | Norway, Stjørdal | 1952-03-09 | -- | 1952–1960 | 4 | |
| Canadian Theatre School | Canadian Theatre School | Canada, Toronto | 1952-05-14 | -- | 1952 | 1 | |
| Centro Hebraico Riograndense | Centro Hebraico Riograndense | Brazil, Porto Alegre, Rua Cel Fernando Machado, 1008 | 1952-10- | -- | 1952 | 1 | |
| Comédie Caumartin | Comédie Caumartin | France, Paris, 25 Rue de Caumartin | 1952-12-09 | -- | 1952–1991 | 2 | |
| Československý rozhlas Praha | Československý rozhlas Praha | Czech Republic, Prague | 1953-09-28 | 2012-10-06 | 1953–2012 | 3 | |
| Comedia Nacional | Comedia Nacional | Uruguay, Montevideo, Ciudad Vieja | 1954-05-21 | -- | 1954–1994 | 3 | |
| Canada | Canada | Canada | 1955-10- | -- | 1955–1956 | 2 | |
| Československý rozhlas Brno | Československý rozhlas Brno | Czech Republic, Brno | 1956-05-10 | 2012-09-29 | 1956–1968 | 3 | |
| Chiswick Town Hall | Chiswick Town Hall | England, Chiswick, London, Heathfield Terrace, Turnham Green | 1956-06-09 | -- | 1956 | 1 | |
| Centraal Theater | Centraal Theater | Netherlands, Amsterdam, Amstelstraat 14-18 | 1956-10-09 | -- | 1956–1957 | 2 | |
| Casino | Casino | Netherlands, Den Bosch | 1956-11-19 | 1989-04-02 | 1956–1992 | 3 | |
| Calcutta | Calcutta | India, West Bengal | 1958-01-10 | 1958-06-11 | 1958 | 1 | |
| Crescent Theatre | The Crescent Theatre | England, Birmingham, Brindleyplace, Sheepcote St | 1959-04-11 | 2000-11-25 | 1959–2000 | 2 | |
| Central Library Theatre | Central Library Theatre | Canada, Toronto | 1959-04-24 | -- | 1959 | 1 | |
| Comedy Theatre | Comedy Theatre | England, London, Panton Street | 1960-01-05 | 2001-07-14 | 1960–2001 | 2 | |
| Circo Teatro Arena | Circo Teatro Arena | Argentina, Buenos Aires, Charcas 558 | 1961-- | -- | 1961 | 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 | |
| College Theatre, San Jose State College | College Theatre, San Jose State College | United States, San Jose, 1 Washington Sq | 1963-03-22 | 1963-03-30 | 1963 | 1 | |
| Carlisle Foyer, Alumni Hall, Springfield College Campus | Carlisle Foyer, Alumni Hall, Springfield College Campus | United States, Springfield, 263 Alden Street | 1963-07-16 | 1963-07-20 | 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, Flushing, 65-30 Kissena Boulevard | 1963-07-19 | 1963-07-27 | 1963 | 1 | |
| Československá televize, Studio Praha | Československá televize, Studio Praha | Czech Republic, Prague | 1964-10-28 | 1994-05-04 | 1964–2000 | 13 | |
| Curran Theatre | Curran Theatre | United States, San Francisco, 445 Geary St | 1965-01-04 | 1965-01-23 | 1965 | 1 | |
| Cincinnati Playhouse in the Park | Cincinnati Playhouse in the Park | United States, Cincinnati, Mount Adams Circle | 1965-04-07 | -- | 1965 | 1 | |
| Casa del Marino | Casa del Marino | Spain, Palmas de Gran Canaria | 1966-02-03 | -- | 1966 | 1 | |
| Close Theatre Club | Close Theatre Club | Scotland, Glasgow | 1968-09-25 | 1968-10-13 | 1968 | 1 | |
| Chichester Festival Theatre | Chichester Festival Theatre | England, Chichester, West Sussex, A286 | 1970-05-13 | 2016-05-21 | 1970–2016 | 3 | |
| Canberra Theatre Centre | Canberra Theatre Centre | Australia, Canberra, Civic Square, London Circuit | 1970-05-14 | 2007-05-26 | 1970–2007 | 4 | |
| Canale 2 | Canale 2 | Italy, Altamura (BA), Via Giovanni Bovio 1, 70022 Altamura (BA) | 1970-05-20 | -- | 1970 | 1 | |
| Citizen's Theatre | Citizen's Theatre | Scotland, Glasgow, 119 Gorbals Street | 1970-06-03 | 2009-05-30 | 1970–2009 | 5 | |
| Cambridge Theatre | Cambridge Theatre | England, London, Earlham St | 1970-06-29 | -- | 1970–1982 | 2 | |
| Cellar Stage Theater | Cellar Stage Theater | United States, Northfield | 1972-02-11 | 1972-02-19 | 1972 | 1 | |
| Citadel Theatre | Citadel Theatre | Canada, Edmonton | 1972-03-22 | 1996-10-06 | 1972–1996 | 3 | |
| Clark Center for the Performing Arts | Clark Center for the Performing Arts | United States, Arroyo Grande, 487 Fair Oaks Avenue | 1972-09-30 | 1972-10-09 | 1972 | 1 | |
| Colonnade Theatre | Colonnade Theatre | Canada, Toronto | 1972-10-30 | -- | 1972 | 1 | |
| Circle Theater Company | Circle Theater Company | United States, Manhattan, Broadway and 83rd street | 1973-04-15 | -- | 1973 | 1 | |
| Comedy Theatre | Comedy Theatre | Australia, Melbourne, 240 Exhibition Street | 1973-09-12 | 1973-10-06 | 1973 | 1 | |
| 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 | 2 | |
| CSC Repertory Theatre | CSC Repertory Theatre | United States, New York, 136 East 13th Street | 1974-02-14 | 1978-04-02 | 1974–1985 | 3 | |
| Court House Theatre | Court House Theatre | Canada, Niagara-on-the-Lake, 26 Queen Street | 1974-06-27 | 2012-09-29 | 1974–2012 | 5 | |
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