| Abbreviation | Definition |
|---|---|
| IGS | Intermediate General Support |
| IGSM | Interim Ground Station Module (JSTARS) |
| IGSM | Interim Ground Support Module |
| IH | Interim Headset |
| IHADSS | Integrated Helmet and Display Sight System (Army) |
| IHAWK | Improved Homing All the Way Killer |
| IHB | Indiana Harmony Brigade |
| IHC | Imperial High Command |
| IHC | International Humanitarian Community |
| IHE | Insensitive High Explosives |
| IHFR | Improved High Frequency Radio |
| IHG | Imperial Home Guard |
| IHO | Industrial Hygiene Officer |
| IHP | Individual Human Performance |
| IHPTET | Integrated High Performance Turbine Engine Technology |
| IHS | International Health Specialist |
| II | Imagery Interpretation |
| IIAA | Iranian Imperial Army Aviation |
| IIB | Interagency Information Bureau |
| IICL | Institute of International Container Lessors |