| Abbreviation | Definition |
|---|---|
| IBT | Integrated Baseline Testing |
| IBTA | Integrated Battlefield Targeting Architecture |
| IBU | Inshore Boat Unit |
| IC | Impose Curfew |
| IC | Incident Commander |
| IC | Integrated Circuit |
| IC | Integration Contractor |
| IC | Intelligence Community |
| IC | Inter Continental |
| IC | Intercept |
| IC | Interface Certification |
| IC&T | Installation, Checkout, and Test |
| IC/EXCOM | Intelligence Community Executive Committee |
| IC3 | Integrated Command, Control, and Communications |
| ICA | Independent Cost Analysis |
| ICA | Integrated Control Architecture |
| ICA | Irish Citizen Army |
| ICAAS | Integrated Control Avionics for Air Superiority |
| ICAD | Individual Concern and Deficiency |
| ICAD | Individuals' Chemical Agent Detector |