| Abbreviation | Definition |
|---|---|
| CI | contact investigation |
| CIA | Crack In America |
| CIA | Crime Intelligence Analyst |
| CIAA | Commission on Investigation of the Abuse of Authority |
| CIASP | Changi International Airport Services Police |
| CIB | Central Intelligence Beurau |
| CIB | Complaints Investigation Branch |
| CIB | Criminal Investigation Branch |
| CIC | Crazy Indian Criminal |
| CID | Criminal Intelligence Department |
| CIDS | Critical Information Dispatch System |
| CIFI | Cleaning Inspection for Forensic Investigation |
| CILC | Citation In Lieu of Custody |
| CIMU | Crime Information Management Unit |
| CIMU | Critical Incident Management Unit |
| CIP | Community Investment Prospectus |
| CIP | Community Involvement Program |
| CIPC | Centre d'information de la police canadienne |
| CIPRUS | Common Integrated Police Record Update System |
| CIRC | Canadian Intelligence Resource Centre |