| Abbreviation | Definition |
|---|---|
| IJC3S | Initial Joint Command, Control, and Communications System |
| IJC3S | Integrated Joint Command, Control, and Communications System |
| IJF | Iraqi Joint Forces |
| IJFT | Interim Jet Fire Test |
| IJMS | Interim JTIDS (Joint Tactical Information Distribution System) Message System |
| IJN | Imperial Japanese Navy |
| IK | Installation Kit |
| IKAT | Interactive Keyboard and Terminal |
| IKCO | Indian King's Commissioned Officer |
| IKP | Instructor and Key Personnel |
| IKPT | Instructor and Key Personnel Training |
| IKRIS | Interoperable Knowledge Representation for Intelligence Support |
| IL | Interim ASAS (All-Source Analysis System) Lightweight Computer Unit |
| IL | Intermediate Location |
| ILA | Independent Liberation Army |
| ILA | Independent Logistics Assessment |
| ILAA | Islamic Liberation Army of Assam |
| ILAMPS | Light Airborne Multi-Purpose System |
| ILAP | Integrated Logistic Analysis Program |
| ILAW | Improved Light Antitank Weapon |