| Abbreviation | Definition |
|---|---|
| IA | Insane Assassins |
| IACC | Independent Anti-Corruption Commission |
| IBFU | Identity and Benefit Fraud Unit |
| IBIS | Integrated Ballistics Identification System |
| IC | InComing |
| IC3 | Internet Crime Complaint Center |
| ICE | Integrated Case Experience |
| ICIS | Interdepartmental Committee on Internal Security |
| ICRC | Interagency Classification Review Committee |
| ICRIS | Integrated Crime Research Information System |
| ICS | Investigative Collaboration System |
| IDA | Institute for Defense Analyses |
| IDCH | Iran Drugs Control Headquarters |
| IDIU | Inter-Divisional Information Act |
| IEC | Intelligence Evaluation Committee |
| IES | Intelligence Evaluation Staff |
| IGRS | Intelligence Gathering and Retrieval System |
| IIC | Interdepartmental Intelligence Conference |
| IMAO | Internet Masking Actual Operation |
| IMT | Incident Management Team |