| Acronym | Definition |
|---|
| FIW➣Forchungsinstitut für Wärmeschutz (German: Research Institute for Thermal Protection) |
| FIW➣Friendship Is Witchcraft |
| FIW➣Fighter Interceptor Wing |
| FIW➣Feature Interaction Workshop |
| FIW➣Freesite Insertion Wizard (software utility) |
| FIW➣Federal Interagency Workgroup (various government agencies) |
| FIW➣Friends in War (website) |
| FIW➣Fuel, Inspect, Wash (maintenance) |
| FIW➣Federation Interprovinciale Wallonne (animal breeders association; Belgium) |
| FIW➣Future Individual Weapon |