word | | Country name |
| Cartier | Ashmore and Cartier Islands | conventional long form: Territory of Ashmore and Cartier Islands conventional short form: Ashmore and Cartier Islands |
| Cayman | Cayman Islands | conventional long form: none conventional short form: Cayman Islands |
| Centrafricaine | 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 |
| Central | 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 |
| Central | Malawi | conventional long form: Republic of Malawi conventional short form: Malawi local long form: Dziko la Malawi local short form: Malawi former: British Central African Protectorate, Nyasaland Protectorate, Nyasaland |
| Ceska | Czech Republic | conventional long form: Czech Republic conventional short form: Czech Republic local long form: Ceska Republika local short form: Cesko |
| Cesko | Czech Republic | conventional long form: Czech Republic conventional short form: Czech Republic local long form: Ceska Republika local short form: Cesko |
| Ceylon | Sri Lanka | ... Socialist Republic of Sri Lanka conventional short form: Sri Lanka local long form: Shri Lamka Prajatantrika Samajaya di Janarajaya/Ilankai Jananayaka Choshalichak Kutiyarachu local short form: Shri Lamka/Ilankai former: Serendib, Ceylon |
| Chad | Chad | conventional long form: Republic of Chad conventional short form: Chad local long form: Republique du Tchad/Jumhuriyat Tshad local short form: Tchad/Tshad |
| Chile | Chile | conventional long form: Republic of Chile conventional short form: Chile local long form: Republica de Chile local short form: Chile |
| China | 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 |