word | | Country name |
| Cook | Cook Islands | conventional long form: none conventional short form: Cook Islands former: Harvey Islands |
| Cooperative | Guyana | conventional long form: Cooperative Republic of Guyana conventional short form: Guyana former: British Guiana |
| Coral | Coral Sea Islands | conventional long form: Coral Sea Islands Territory conventional short form: Coral Sea Islands |
| Costa | Costa Rica | conventional long form: Republic of Costa Rica conventional short form: Costa Rica local long form: Republica de Costa Rica local short form: Costa Rica |
| Cote | Cote d'Ivoire | conventional long form: Republic of Cote d'Ivoire conventional short form: Cote d'Ivoire local long form: Republique de Cote d'Ivoire local short form: Cote d'Ivoire note: pronounced coat-div ... |
| Country | Sint Maarten | Dutch long form: Land Sint Maarten Dutch short form: Sint Maarten English long form: Country of Sint Maarten English short form: Sint Maarten former: Netherlands Antilles; Curacao and Dependencies |
| Crna | Montenegro | conventional long form: none conventional short form: Montenegro local long form: none local short form: Crna Gora former: People's Republic of Montenegro, Socialist Republic of Montenegro, Republic of Montenegro |
| Croatia | Croatia | conventional long form: Republic of Croatia conventional short form: Croatia local long form: Republika Hrvatska local short form: Hrvatska former: People's Republic of Croatia, Socialist Republic of Croatia |
| Cuba | Cuba | conventional long form: Republic of Cuba conventional short form: Cuba local long form: Republica de Cuba local short form: Cuba |
| Cumhuriyeti | Cyprus | ... conventional long form: Republic of Cyprus conventional short form: Cyprus local long form: Kypriaki Dimokratia/Kibris Cumhuriyeti local short form: Kypros/Kibris note: the Turkish Cypriot community, which administers the northern part ... |