FB

FB can stand for:
* Bulgaria Air IATA code
* Facebook, a social networking website
* Fall Brawl, a WCW pay-per-view event
* Fast busy, or Reorder tone, a type of telephone signal
* Farmers Branch, Texas, a suburb of Dallas, Texas
* Fenerbahçe S.K., a Turkish sports club
* Fine business, a common ham radio slang term
* Firebase, an artillery encampment
* FirstBoat, an informational boating website at [http://www.firstboat.com FirstBoat.com]
* Fly ball, a type of batted ball or a pitching stat in baseball
* Football, a sport
* Framebuffer, in computer technology
* FreeBASIC, a 32-bit compiler using BASIC syntax for DOS, Windows, and Linux
* Friendship book, a booklet swapped amongst pen pals
* Fruits Basket, a manga and anime series
* Fullback, a position in American football
* Fullback, a position in Australian football
* Hyundai FB, a series of buses manufactured by Hyundai Motor Company
* Fuck Buddy, a slang
* Final Boss, Pro Halo 3 Team