| Abbreviation | Definition |
|---|---|
| CV | Cape Verde |
| CVI | Cape Verde Islands |
| CX | Christmas Island |
| CY | Cyprus |
| CZ | Canal Zone |
| CZ | Coastal Zone |
| CZ | Czech Republic |
| CZECH | Czech Republic |
| CZECH | Czechoslovakia |
| DCPS | Developing Countries Partnership Scholarship |
| DCVRN | Developing Countries Vaccine Regulators Network |
| DCVRN | Developing Countries Vaccine Regulatory Network |
| DE | DEutschland (Germany) |
| DIOC | Database on Immigrants in OECD Countries |
| DJ | Djibouti |
| DK | Denmark |
| DM | Dominica |
| DO | Dominican Republic |
| DOA | Deutsch Ost Afrika |
| DPRK | Democratic People's Republic of Korea (North Korea) |