| Abbreviation | Definition |
|---|---|
| BWC | Bureau Of Workers Compensation |
| BXA | Bureau of Export Administration |
| BZPP | Buffer Zone Protection Program |
| C | Captain |
| C | caution |
| C | Citizen |
| C | Communism |
| C | Constitution |
| C | Cost |
| C | Counted |
| CA | Canada |
| CA | Clean Air |
| CA | Continuous Assessment |
| CAAS | Contracted Advisory Assistance Services |
| CAASD | Center for Advanced Aviation System Development |
| CAB | Country Analysis Brief |
| CAC | Cancer Assessment Committee |
| CAC | Carcinogenicity Assessment Committee (CDER) |
| CACFA | Citizen's Advisory Commission on Federal Areas |
| CACTIS | Center ADP/TC Computer Tracking and Inventory System (CFSAN) |