| Abbreviation | Definition |
|---|---|
| CMR | Cameroon |
| CN | China |
| CO | Colombia |
| COG | Congo |
| COL | Column |
| COW | Child Of Wisdom |
| CPDES | Colonia Portuguesa da Espirito Santo |
| CPLC | Community of Portuguese Language Countries |
| CPT | Cape Town |
| CR | Costa Rica |
| CR | Czech Republic |
| CS | Former Czechoslovakia |
| CSA | Confederate States of America |
| CSDC | Center for the Study of Developing Countries |
| CSIDC | Center for Social Innovation in Developing Countries |
| CSSR | eskoSlovenská Socialistická Republika |
| CSSR | ??eskoSlovensk?? Socialistick?? Republika |
| CSSR | CeskoSlovenská Socialistická Republika |
| CSTO | Collective Security Treaty Organization |
| CU | Cuba |