| C.I.A. | 6 September 1996 | Original Production | — |
| C.I.A. Deep Kut | — | Original Production | — |
| C64Audio.com | August 1995 | Original Production | — |
| Cacophonous Records | 1993 | Original Production | 7871 |
| CalmDownKidder Records | 2007 | Original Production | — |
| Camden | October 1953 | Imprint | 316 |
| Capitol Records UK | 2013 | Imprint | — |
| Capo | 1987 | Production | 990 |
| Cargo Records | 1992 | Distributor | — |
| Carlin Recorded Music Library | 1966 | Original Production | 7189 |
| Carlton Classics | — | Imprint | 8747 |
| Caroline International | 1 August 2013 | Distributor | 15105 |
| Castle Classics | — | Reissue Production | 6448 |
| Castle Communications | 1983 | Imprint | 6448 |
| Castle Music | 1999 | Imprint | 6448 |
| Castle Pulse | — | Reissue Production | 6448 |
| Catskills Records | 1997 | Original Production | — |
| Cause 4 Concern | — | Original Production | — |
| Cavendish Music | 2 December 1954 | Original Production | 7053 |
| Certificate 18 | — | Original Production | 2592 |
| Chaconne | 1989 | Original Production | 7038 |
| Champion | 1984 | Original Production | — |
| Chandos | 1979 | Original Production | 7038 |
| Chandos Classics | — | Reissue Production | — |
| Chappell Recorded Music Library | 1941 | Publisher | — |
| Charisma | 1969 | Original Production | — |
| Charly Records | 1974 | Imprint | 8477 |
| Cheeky Records | 1991 | Original Production | 2463 |
| Chemikal Underground | February 1995 | Original Production | — |
| Cherry Pop | — | Reissue Production | — |
| Cherry Red Records | 1978 | Production | — |
| Chess Club Records | 8 October 2006 | — | 60108 |
| China Records | 1 October 1984 | Original Production | 1896 |
| Chiswick | 1975 | Original Production | 4658 |
| Chopped Herring Records | 2001 | Original Production | — |
| Chrome Dreams | 1998 | Publisher | — |
| Chronic | — | Imprint | — |
| Chrysalis | 1969 | Imprint | 1626 |
| Ché Trading | 1991 | Original Production | — |
| Circulation | 1998 | Original Production | — |
| City Beat | — | Original Production | — |
| Classic | — | Original Production | — |
| Classic CD | April 1990 | — | — |
| Classic FM | — | Reissue Production | 5303 |
| Classic Rock | 1998 | — | — |
| Classics for Pleasure | — | Imprint | 464 |
| Clay Records | — | Original Production | — |
| Clean Up Records | — | Original Production | 2920 |
| Clear | 28 August 1994 | Original Production | — |
| Coalition Recordings | — | Original Production | — |
| Code Blue | — | Original Production | — |
| Cohesion | — | Original Production | 1051 |
| Collins Classics | 1989 | Production | — |
| Colorize | — | Imprint | — |
| Columbia Graphophone Co. Ltd. | 13 February 1917 | — | private company limited by shares |
| Columbia Records | 21 April 1931 | Original Production | 162 |
| Commercial Suicide | 2001 | Original Production | — |
| Concrete | — | Original Production | — |
| Confidential Records | 1 November 1980 | Imprint | — |
| Congo Natty Records | 1994 | Original Production | — |
| Cooking Vinyl | 1986 | Original Production | 7180 |
| Cooperative Music | 2005 | Original Production | 14017 |
| Coro | 2001 | — | — |
| COS Recordings | — | Original Production | — |
| Counter Records | — | Original Production | 34609 |
| Covert Operations Recordings | 1999 | Original Production | — |
| CRD Records | 1965 | Original Production | — |
| Creation Records | 1983 | Original Production | 6306 |
| Creative Source | 1995 | Original Production | — |
| Creative Wax | 1992 | Original Production | — |
| Creole Records | — | Original Production | 420 |
| Crimson | — | Imprint | 13222 |
| Critical Music | 2002 | Original Production | — |
| Cross Records | March 2020 | Imprint | — |
| Crosstown Rebels | 2003 | Original Production | — |
| Crucast | — | Original Production | — |
| Cruel Nature Records | 2013 | Original Production | — |
| Cup of Tea Records | 1995 | Original Production | — |
| Cyclops | 1994 | Production | — |