| Abbreviation | Definition |
|---|---|
| CCH | Computerized Criminal Histories |
| CD | CounterDrug |
| CDC | Centers for Disease Control and Prevention |
| CDG | Civil Disturbance Group |
| CE | Charlotte Field Office |
| CF | Case File |
| CFR | Code of Federal Regulations |
| CG | Chicago Field Office |
| CGR | Crime on Governmental Reservations |
| CH | CHannelized |
| CHICOM | CHInese COMmunist |
| CHRS | Criminal History Record Search |
| CI | Cincinnati Field Office |
| CI | Communist Index |
| CI | Confidential Informant |
| CI | Counter-Intelligence |
| CI | Criminal Investigator |
| CIA | Central Intelligence Agency |
| CIC | Counter-Intelligence Corps |
| CICP | Construction Industry Crime Prevention |