| Abbreviation | Definition |
|---|---|
| IACE | International Advanced Cadet Exam |
| IACE | International Air Cadet Exchange |
| IACG | Interagency Coordination Group |
| IACOP | International Armaments Cooperative Opportunities Plan |
| IAD | Illuminati is At Door |
| IAD | Instructor Assisted Deployment |
| IADB | Inter-American Defense Board |
| IADS | Integrated Air Defense System |
| IAEA | International Atomic Energy Agency (UN) |
| IAF | Indian Air Force |
| IAF | Israeli Air Force |
| IAFK | Imperial Armed Forces of Krospovia |
| IAG | International Army of Gamers |
| IAGC | Instantaneous Automatic Gain Control |
| IAI | Israel Aircraft Industry |
| IAIP | Information Analysis and Infrastructure Protection |
| IAIS | Improved Avionics Intermediate Shop |
| IAM | Inertially Aided Munition |
| IAMD | Integrated Air and Missile Defense |
| IAMS | Integrated Army Mobilization Study |