| 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 of America, Northfield | 1972-02-11 | 1972-02-19 | 1972 | 1 | |
| Citadel Theatre | Citadel Theatre | Canada, Edmonton | 1972-03-22 | 1996-10-06 | 1972–1996 | 3 | |
| Château de Noirmoutier | Château de Noirmoutier | France, Noirmoutier-en-l'Île, Place d'Armes | 1972-07-17 | 1972-08-06 | 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 | |
| Colonnade Theatre | Colonnade Theatre | Canada, Toronto | 1972-10-30 | -- | 1972 | 1 | |
| Circle Theater Company | Circle Theater Company | United States of America, 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 | 3 | |
| 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 | |
| Court House Theatre | Court House Theatre | Canada, Niagara-on-the-Lake, 26 Queen Street | 1974-06-27 | 2012-09-29 | 1974–2012 | 5 | |
| Centre d'Etudes Théâtrales | Centre d'Etudes Théâtrales | Belgium, Louvain-la-Neuve, 1348 Ottignies | 1975-- | -- | 1975 | 1 | |
| Castillo de Doña Berenguela | Castillo de Doña Berenguela | Spain, Bolaños de Calatrava | 1975-07- | -- | 1975 | 1 | |
| Canberra Repertory Society | Canberra Repertory Society | Australia, Canberra | 1975-07-10 | 2019-03-02 | 1975–2019 | 2 | |
| Circle in the Square Theatre | Circle in the Square Theatre | United States of America, New York, 235 West 50th St. | 1976-02-27 | 2024-06-23 | 1976–2024 | 3 | |
| Centre Dramatique National des Alpes - Maison de la Culture de Grenoble | Centre Dramatique National des Alpes - Maison de la Culture de Grenoble | France, Grenoble, 24 Rue des Trembles | 1976-04-07 | 1976-04-30 | 1976 | 1 | |
| Crucible Studio | Crucible Studio | England, Sheffield, South Yorkshire, 55 Norfolk Street | 1976-04-21 | 1999-06-19 | 1976–1999 | 3 | |
| Centre d'Animation Culturelle de Paris | Centre d'Animation Culturelle de Paris | France, Paris | 1977-01-24 | -- | 1977 | 1 | |
| Crescent Theatre | Crescent Theatre | Ireland, Limerick | 1980-02-11 | 1980-02-16 | 1980 | 1 | |
| Capitol-Kino | Capitol-Kino | Germany, Walsrode | 1980-02-20 | -- | 1980 | 1 | |
| Casino-Theater | Casino-Theater | Switzerland, Frauenfeld | 1980-03-05 | -- | 1980–2019 | 3 | |
| Comprehensive School | Comprehensive School | Ireland, Glenties | 1980-03-21 | 1980-03-22 | 1980 | 1 | |
| Canal 13 | Canal 13 | Mexico | 1980-04-16 | -- | 1980 | 1 | |
| Chicago City Theatre | Chicago City Theatre | United States of America, Chicago, 5965 North Clark Street | 1980-09-11 | 1980-10-19 | 1980 | 1 | |
| Chesterfield Civic Theatre | Chesterfield Civic Theatre | England, Chesterfield, Derbyshire, Corporation Street | 1980-09-24 | 1980-10-04 | 1980 | 1 | |
| Court Theatre | Court Theatre | United States of America, Chicago, 5535 South Ellis Avenue | 1981-01-15 | 2022-03-27 | 1981–2022 | 6 | |
| Colgate University Theater | Colgate University Theater | United States of America, Hamilton, 13 Oak Drive | 1981-04-22 | 1981-04-25 | 1981 | 1 | |
| Classic Stage Company | Classic Stage Company | United States of America, New York, 136 E 13th St | 1981-11-08 | 2016-06-27 | 1981–2016 | 7 | |
| Channel 2 (Italy) | Channel 2 (Italy) | Italy | 1982-01-25 | -- | 1982 | 1 | |
| Chiesa di san Nicolò | Chiesa di San Nicolò | Italy, Spoleto | 1982-06-26 | -- | 1982 | 1 | |
| China Central Academy of Theatre | China Central Academy of Theatre | China, Beijing, 39# Dong Mianhua Hutong, Dongcheng Dist., Beijing, China | 1983-05-29 | -- | 1983 | 1 | |
| Činoherní studio | Činoherní studio | Czech Republic, Ústí nad Labem, Varšavská 767 | 1984-05-28 | -- | 1984–2011 | 2 | |
| Caxton theatre and Arts Centre | Caxton theatre and Arts Centre | England, Grimsby, Cleethorpe Road Great Grimsby | 1985-02-07 | -- | 1985 | 1 | |
| Centre culturel Mathis | Centre culturel Mathis | France, Paris, 15, rue Mathis | 1985-03-14 | 1985-03-16 | 1985 | 1 | |
| Center Stage, St. Lawrence Centre | Center Stage, St. Lawrence Centre | Canada, Toronto, 27 Front St E | 1985-04-11 | -- | 1985 | 1 | |
| Coye la Forêt, Centre Culturel de | Centre Culturel de Coye la Forêt | France, Coye-la-Forêt, 21 Rue d'Hérivaux | 1985-05-11 | 1997-05-24 | 1985–1997 | 3 | |
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