| Country | Constitution |
| Cambodia | promulgated 21 September 1993 |
| Cameroon | approved by referendum 20 May 1972; adopted 2 June 1972; revised January 1996 |
| Canada | made up of unwritten and written acts, customs, judicial decisions, and traditions; the written part of the constitution consists of the Constitution Act of 29 March 1867, which created a federation of four provinces, and the Constitution Act of 17 April 1982, which transferred formal control over the constitution from Britain to Canada, and added a Canadian Charter of Rights and Freedoms as well as procedures for constitutional amendments |
| Cape Verde | 25 September 1992; a major revision on 23 November 1995 substantially increased the powers of the president; a 1999 revision created the position of national ombudsman (Provedor de Justica) |
| Cayman Islands | 1959; revised 1962, 1972, and 1994 |
| Central African Republic | ratified by popular referendum 5 December 2004; effective 27 December 2004 |
| Chad | passed by referendum 31 March 1996; a June 2005 referendum removed constitutional term limits |
| Chile | 11 September 1980, effective 11 March 1981; amended 1989, 1991, 1997, 1999, 2000, 2003, and 2005 |
| China | most recent promulgation 4 December 1982 with amendments in 1988 and 1993 |
| Christmas Island | Christmas Island Act of 1958-59 (1 October 1958) as amended by the Territories Law Reform Act of 1992 |
| Clipperton Island | void |
| Cocos (Keeling) Islands | Cocos (Keeling) Islands Act of 1955 (23 November 1955) as amended by the Territories Law Reform Act of 1992 |
| Colombia | 5 July 1991; amended many times |
| Comoros | 23 December 2001 |
| Congo, Democratic Republic of the | 18 February 2006 |
| Congo, Republic of the | approved by referendum 20 January 2002 |
| Cook Islands | 4 August 1965 |
| Coral Sea Islands | void |
| Costa Rica | 7 November 1949 |
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