word | | Country name |
| Cabo | 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 |
| Caicos | Turks and Caicos Islands | conventional long form: none conventional short form: Turks and Caicos Islands abbreviation: TCI |
| Caledonia | New Caledonia | conventional long form: Territory of New Caledonia and Dependencies conventional short form: New Caledonia local long form: Territoire des Nouvelle-Caledonie et Dependances local short form: Nouvelle-Caledonie |
| Caledonie | New Caledonia | conventional long form: Territory of New Caledonia and Dependencies conventional short form: New Caledonia local long form: Territoire des Nouvelle-Caledonie et Dependances local short form: Nouvelle-Caledonie |
| Cambodia | Cambodia | conventional long form: Kingdom of Cambodia conventional short form: Cambodia local long form: Preahreacheanachakr Kampuchea (phonetic pronunciation) local short form: Kampuchea former: Khmer Republic, Democratic Kampuchea, People's Republic of Kampuchea, State ... |
| Cameroon | Cameroon | conventional long form: Republic of Cameroon conventional short form: Cameroon local long form: Republique du Cameroun/Republic of Cameroon local short form: Cameroun/Cameroon former: French Cameroon, British Cameroon, Federal Republic of ... |
| Cameroun | Cameroon | conventional long form: Republic of Cameroon conventional short form: Cameroon local long form: Republique du Cameroun/Republic of Cameroon local short form: Cameroun/Cameroon former: French Cameroon, British Cameroon, Federal Republic of ... |
| Canada | Canada | conventional long form: none conventional short form: Canada |
| Cape | 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 |
| CAR | 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 |