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