| Abbreviation | Definition |
|---|---|
| IETS | Interactive Electronic Technical Specification |
| IEV | Intelligent Electric Vehicles |
| IEWCS | Intelligence and Electronic Warfare Common Sensor |
| IEWCS | Intelligence Electronic Warfare Common Sensors |
| IEWS | Information Electronic Warfare Systems |
| IEWS | Integrated Electronic Warfare System |
| IEWS | Intelligence Electronic Warfare and Sensors |
| IF | Input Filter |
| IF | InterFace |
| IF | Intermediate Filament |
| IF | Intermediate Frequency |
| IFDR | Improved Force Directed Relaxation |
| IFEP | integrated full electric propulsion |
| IFF | Commodore Amiga Image format |
| IFF | Identification Friend or Foe |
| IFF | If and only if |
| IFF | Interchange File Format |
| IFPA | Intermediate-Frequency Pre-Amplifier |
| IFR | Increasing Failure Rate |
| IFT | InterFerential current Therapy |