| Abbreviation | Definition |
|---|---|
| IFOV | Instantaneous Field-of-View |
| IFP | Integrated Force Package |
| IFPA | Institute for Foreign Policy Analysis |
| IFPA | International Fighter Pilots Academy |
| IFPC | Indirect Fire Protection Capability |
| IFQT | Informal Qualification Test |
| IFQT | Initial Formal Qualification Test |
| IFR | Instrument Flight Rules |
| IFRC | International Federation of Red Cross and Red Crescent Societies |
| IFS | Indian Foreign Service |
| IFS | Inshore Fire Support ship |
| IFS | Integrated Facilities System |
| IFSAR | Interferometric Synthetic Aperture Radar |
| IFSAS | Initial Fire Support Automation System |
| IFS-M | Integrated Facilities System-Mini/Micro |
| IFTD | Infantry Film and Television Department |
| IFTE | Intermediate Forward Test Equipment |
| IFV | Infantry Fighting Vehicle |
| IFVs | Infantry Fighting Vehicles |
| IG | Imperial Guard |