| Country | National holiday |
| Cape Verde | Independence Day, 5 July (1975) |
| Cayman Islands | Constitution Day, first Monday in July |
| Central African Republic | Republic Day, 1 December (1958) |
| Chad | Independence Day, 11 August (1960) |
| Chile | Independence Day, 18 September (1810) |
| China | Anniversary of the Founding of the People's Republic of China, 1 October (1949) |
| Christmas Island | Australia Day, 26 January (1788) |
| Clipperton Island | void |
| Cocos (Keeling) Islands | Australia Day, 26 January (1788) |
| Colombia | Independence Day, 20 July (1810) |
| Comoros | Independence Day, 6 July (1975) |
| Congo, Democratic Republic of the | Independence Day, 30 June (1960) |
| Congo, Republic of the | Independence Day, 15 August (1960) |
| Cook Islands | Constitution Day, first Monday in August (1965) |
| Coral Sea Islands | void |
| Costa Rica | Independence Day, 15 September (1821) |
| Cote d'Ivoire | Independence Day, 7 August (1960) |
| Croatia | Independence Day, 8 October (1991); note - 25 June 1991 was the day the Croatian Parliament voted for independence; following a three-month moratorium to allow the European Community to solve the Yugoslav crisis peacefully, Parliament adopted a decision on 8 October 1991 to sever constitutional relations with Yugoslavia |
| Cuba | Triumph of the Revolution, 1 January (1959) |
| Curacao | Queen's Day (Birthday of Queen-Mother JULIANA and accession to the throne of her oldest daughter BEATRIX), 30 April (1909 and 1980) |
| Cyprus | Independence Day, 1 October (1960); note - Turkish Cypriots celebrate 15 November (1983) as "Independence Day" |