word | | Country name |
| conventional | Cape Verde | conventional long form: Republic of Cape Verde conventional short form: Cape Verde local long form: Republica de Cabo Verde local short form: Cabo Verde |
| conventional | Cayman Islands | conventional long form: none conventional short form: Cayman Islands |
| conventional | Central African Republic | conventional long form: Central African Republic conventional short form: none local long form: Republique Centrafricaine local short form: none former: Ubangi-Shari, Central African Empire abbreviation: CAR |
| conventional | Chad | conventional long form: Republic of Chad conventional short form: Chad local long form: Republique du Tchad/Jumhuriyat Tshad local short form: Tchad/Tshad |
| conventional | Chile | conventional long form: Republic of Chile conventional short form: Chile local long form: Republica de Chile local short form: Chile |
| conventional | China | conventional long form: People's Republic of China conventional short form: China local long form: Zhonghua Renmin Gongheguo local short form: Zhongguo abbreviation: PRC |
| conventional | Christmas Island | conventional long form: Territory of Christmas Island conventional short form: Christmas Island |
| conventional | Clipperton Island | conventional long form: none conventional short form: Clipperton Island local long form: none local short form: Ile Clipperton former: sometimes called Ile de la Passion |
| conventional | Cocos (Keeling) Islands | conventional long form: Territory of Cocos (Keeling) Islands conventional short form: Cocos (Keeling) Islands |
| conventional | Colombia | conventional long form: Republic of Colombia conventional short form: Colombia local long form: Republica de Colombia local short form: Colombia |
| conventional | Comoros | conventional long form: Union of the Comoros conventional short form: Comoros local long form: Union des Comores local short form: Comores |
| conventional | Congo, Democratic Republic of the | conventional long form: Democratic Republic of the Congo conventional short form: none local long form: Republique Democratique du Congo local short form: none former: Congo Free State, Belgian Congo, Congo/Leopoldville, Congo ... |
| conventional | Congo, Republic of the | conventional long form: Republic of the Congo conventional short form: Congo (Brazzaville) local long form: Republique du Congo local short form: none former: Middle Congo, Congo/Brazzaville, Congo |
| conventional | Cook Islands | conventional long form: none conventional short form: Cook Islands former: Harvey Islands |
| conventional | Coral Sea Islands | conventional long form: Coral Sea Islands Territory conventional short form: Coral Sea Islands |
| conventional | 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 |
| conventional | 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 ... |
| conventional | 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 |
| conventional | Cuba | conventional long form: Republic of Cuba conventional short form: Cuba local long form: Republica de Cuba local short form: Cuba |
| conventional | 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 ... |
| conventional | Czech Republic | conventional long form: Czech Republic conventional short form: Czech Republic local long form: Ceska Republika local short form: Cesko |
| conventional | Denmark | conventional long form: Kingdom of Denmark conventional short form: Denmark local long form: Kongeriget Danmark local short form: Danmark |