| Comedy Theatre | Comedy Theatre | England, London, Panton Street | 1960-01-05 | 2001-07-14 | 1960–2001 | 2 | |
| Chiswick Town Hall | Chiswick Town Hall | England, London, Heathfield Terrace, Turnham Green, Chiswick | 1956-06-09 | -- | 1956 | 1 | |
| Cambridge Theatre | Cambridge Theatre | England, London, Earlham St | 1970-06-29 | -- | 1970–1982 | 2 | |
| Cripplegate Institute | Cripplegate Institute | England, London, Brackley Street | 1905-11-28 | -- | 1905 | 1 | |
| Courtyard Theatre, The | The Courtyard Theatre | England, London, Bowling Green Walk, 40 Pitfield St, | 2013-01-09 | 2013-01-20 | 2013 | 1 | |
| Chelsea Palace Theatre | Chelsea Palace Theatre | England, London, 232 - 242 Kings Road | 1921-05-01 | -- | 1921 | 1 | |
| Croydon Repertory Theatre | Croydon Repertory Theatre | England, London, 23 Wellesley Road | 1932-10-17 | -- | 1932–1936 | 4 | |
| Criterion Theatre | Criterion Theatre | England, London, 2 Jermyn Street | 1891-06-02 | -- | 1891–1973 | 7 | |
| Coronet Theatre, The | The Coronet Theatre | England, London, 103 Notting Hill Gate | 2022-02-24 | 2024-11-02 | 2022–2024 | 2 | |
| Century Theatre | Century Theatre | England, London | 1927-01-17 | 1930-05-08 | 1927–1930 | 3 | |
| Chanticleer Theatre Club | Chanticleer Theatre Club | England, London | 1945-02-24 | 1945-04-29 | 1945 | 3 | |
| Covent Garden Festival | Covent Garden Festival | England, London | 1990-09- | -- | 1990 | 1 | |
| Christchurch Studio Theatre | Christchurch Studio Theatre | England, London | 1951-03-06 | 1951-03-11 | 1951 | 1 | |
| Capstone Theatre | Capstone Theatre | England, Liverpool, Shaw Street | 2013-10-07 | 2014-10-13 | 2013–2014 | 2 | |
| Curve | Curve | England, Leicester, 60 Rutland St | 2017-10-23 | 2017-10-28 | 2017 | 1 | |
| Compass Theatre | Compass Theatre | England, Ickenham, Glebe Ave, Uxbridge | 2007-02-14 | 2007-02-17 | 2007 | 1 | |
| Christ's Hospital School | Christ's Hospital School | England, Horsham, Christ's Hospital | 2018-10-08 | -- | 2018 | 1 | |
| Courtyard Theatre | Courtyard Theatre | England, Hereford, Edgar Street | 1999-07-16 | -- | 1999–2018 | 3 | |
| Caxton Theatre Grimsby | Caxton Theatre Grimsby | England, Grimsby, Cleethorpe Road Great Grimsby | 1985-02-07 | -- | 1985 | 1 | |
| Cygnet New Theatre | Cygnet New Theatre | England, Exeter, Friars Gate | 2003-03-28 | 2008-06-21 | 2003–2007 | 3 | |
| Crown Theatre | Crown Theatre | England, Eccles, Church Street | 1910-02-07 | 1910-02-10 | 1910 | 2 | |
| Court House, The | The Court House | England, Eastleigh, Leigh Road | 2015-01-08 | 2015-01-10 | 2015 | 1 | |
| Chequer Mead Theatre | Chequer Mead Theatre | England, East Grinstead, De La Warr Road | 1999-06-04 | 2011-01-30 | 1999–2018 | 3 | |
| Cornerstone Arts Centre | Cornerstone Arts Centre | England, Didcot, 25 Station Road | 2014-10-04 | 2014-10-04 | 2014–2018 | 3 | |
| Civic Theatre | Civic Theatre | England, Darlington, Parkgate | 2004-02-24 | 2004-02-28 | 2004 | 1 | |
| Crediton Drama Centre | Crediton Drama Centre | England, Crediton, Devon, East St | 2003-03-21 | -- | 2003 | 1 | |
| Coventry | Coventry | England, Coventry | -- | -- | | | |
| Chichester Festival Theatre | Chichester Festival Theatre | England, Chichester, A286 | 1970-05-13 | 2016-05-21 | 1970–2016 | 3 | |
| Chesterfield Civic Theatre | Chesterfield Civic Theatre | England, Chesterfield, Corporation Street | 1980-09-24 | 1980-10-04 | 1980 | 1 | |
| Chester | Chester | England, Chester | -- | -- | | | |
| Cramphorn Theatre | Cramphorn Theatre | England, Chelmsford, Essex, Fairfield Rd | 1993-05-18 | 1993-10-23 | 1993 | 1 | |
| Chads Theatre | Chads Theatre | England, Cheadle, Mellor Rd, Cheadle Hulme | 2016-10-22 | 2016-10-29 | 2016 | 1 | |
| Charlton Park | Charlton Park | England, Canterbury | 2018-06-24 | -- | 2018 | 1 | |
| Comberton Village College | Comberton Village College | England, Cambridgeshire, West Street, Comberton | 2017-07-08 | -- | 2017 | 1 | |
| Cambridge Arts Theatre | Cambridge Arts Theatre | England, Cambridge, 6 St Edward's Passage | 1942-11-09 | 2002-04-06 | 1942–2002 | 5 | |
| Churchill Theatre | Churchill Theatre | England, Bromley, High St | 2003-04-08 | 2003-04-12 | 2003 | 1 | |
| Crescent Theatre | The Crescent Theatre | England, Birmingham, Brindleyplace, Sheepcote St | 1959-04-11 | 2000-11-25 | 1959–2000 | 2 | |
| Cantabile 2 | Cantabile 2 | Denmark, Stege, Kostervej 2b | 2013-09-23 | -- | 2013 | 1 | |
| Casino | Casino | Denmark, Slagelse | 1907-12-11 | -- | 1907 | 2 | |
| Casino Teater | Casino Teater | Denmark, Ringsted | 1907-12-12 | -- | 1907 | 1 | |
| Colosseum | Colosseum | Denmark, Frederikshavn | 2002-10-15 | -- | 2002 | 1 | |
| CaféTeatret | CaféTeatret | Denmark, Copenhagen, Skindergade 3 | 1988-05-24 | -- | 1988 | 1 | |
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