| Acronym | Definition |
|---|
| FIB | Focused Ion Beam |
| FIB | Forwarding Information Base |
| FIB | Festival Internacional de Benicàssim |
| FIB | Fast Internal Bus Buffer |
| FIB | Fiber Interface Board |
| FIB | Flume Ille Badminton (French badminton club) |
| FIB | Fill-In-The-Blank |
| FIB | Faisal Islamic Bank (various locations) |
| FIB | Fédération de l'Industrie du Béton (French: Concrete Industry Federation) |
| FIB | Facultat d'Informàtica de Barcelona |
| FIB | Fish in A Barrel |
| FIB | Federazione Italiana Bocce (Italian Bocce Federation) |
| FIB | Flying Inflatable Boat |
| FIB | Forward Indicator Bit (SS7 MTP Layer 2) |
| FIB | Fires Brigade |
| FIB | Federal Investigation Bureau (Grand Theft Auto IV) |
| FIB | Fast Information Block |
| FIB | Fraud Intelligence Bureau (UK) |
| FIB | Freshwater Invertebrate Biology (journal) |
| FIB | Fédération Internationale de Boules |
| FIB | Flight Information Bulletin |
| FIB | Frequency-Invariant Beamformer |
| FIB | Foundation for Internet Begging |
| FIB | Fishing-in-Balance Index (marine ecosystems) |
| FIB | Friendly Illinois Brethren/Buddy (polite form of a derogatory nickname for Illinois residents in Wisconsin) |
| FIB | Fields by Information Blending |
| FIB | Forwarding Information Block |
| FIB | Field Information Bulletin (Unisys) |
| FIB | File Interface Block |
| FIB | Frame Insertion Board |