| Acronym | Definition |
|---|
| FB | Facebook (website) |
| FB | Football |
| FB | Fantasy Baseball |
| FB | Fachbereich |
| FB | Firebird |
| FB | Fallback |
| FB | Bulgaria Air (airline code) |
| FB | Frauenbeauftragte (German: Women's Assembly) |
| FB | First Blood (gaming clan) |
| FB | Facility-Based |
| FB | Board Feet (Canada) |
| FB | Facilities Based |
| FB | FinalBurn (arcade game emulator) |
| FB | Facilities Board |
| FB | Firebat (Starcraft game) |
| FB | Fire Bush |
| FB | Fast Broadcasting |
| FB | Furukawa Battery Co. Ltd. (Japan) |
| FB | Fatty Bombatty (font) |
| FB | Funbots (QuakeNet gaming) |
| FB | Foolish Buyer (real estate) |
| FB | Fauve de Bourgogne (rabbit breed) |
| FB | Failure Biasing |
| FB | Frontline Brothers (gaming clan) |
| FB | Four-way Box |
| FB | Farside Blues |
| FB | Fine Business (morse code used by ham radio operators) |
| Fb | Frederiksberg (Danish railway station) |
| FB | Farum Boldklub (Danish soccer club) |
| FB | Finance Bureau (Hong Kong) |
| FB | Flat Bed |
| FB | Final Boss (gaming clan) |
| FB | Friends with Benefits |
| FB | FoxBox |
| FB | Finance Battalion |
| FB | Footbridge (UK maps) |
| FB | Fixed Bridge |
| FB | Fishing Boat |
| FB | Full Bridge |
| FB | Fuse Board |
| FB | Frame Buffer |
| FB | Freight Bill |
| FB | Fullback |
| FB | Farm Bureau |
| FB | Flashbang |
| FB | Fast Busy |
| FB | Fat Bastard |
| FB | Feedback |
| FB | Fenerbahce (Turkey) |
| FB | Fenian Brotherhood |
| FB | Fighter Bomber |
| FB | Fire Base |
| FB | Fire Break |
| FB | Firing Battery |
| FB | Fixed Block |
| FB | Flat Bar |
| FB | Foreign Body |
| FB | Forward Boundary |
| FB | Foul Ball |
| FB | Feature Board (Cisco) |
| FB | Fly-By |
| FB | Fully Built (rebuild engine with aftermarket parts, generally high power output) |
| FB | Fire Builder (Mic-O-Say, Heart of America Council, Boy Scouts of America) |
| FB | Fireball (gaming) |
| FB | Federal Building |
| FB | Fusebox (web application framework) |
| FB | Fruits Basket (anime) |
| FB | Fun Buddy (polite form) |
| FB | Finger Breadth |
| FB | Felügyelo Bizottság (Hungarian: Supervisory Board) |
| FB | Framing Bit |
| FB | Fly Ball (baseball) |
| FB | Full Bath |
| Fb | From Below |
| FB | Financing Bill |
| FB | Fast Break |
| FB | Fozzie Bear (The Muppet Show character) |
| FB | Full Board (hospitality industry) |
| FB | Fiber-Optic Backbone |
| FB | Fenerbahce (Turkish Soccer Team) |
| FB | Frostburn (roleplaying games, Dungeons & Dragons) |
| FB | Fiber Board |
| FB | Furnace Brazing |
| FB | Friendship Book (swapping) |
| FB | Flashback |
| FB | Foosball |
| FB | Fuse Block |
| FB | Frostbite |
| FB | Fresno Bee (newspaper) |
| FB | Ferris Bueller (movie character) |
| FB | Fringe Benefit |
| FB | Fluxbox (Unix/Linux window manager) |
| FB | Frank Black (musician) |