FB
- BF (disambiguation)
- Bulgaria Air
- F B swamp vehicle
- FB "Łucznik" Radom
- FB (band)
- Fat Bastard
- Feedback
- Femtobarn
- Fenerbahçe
- FictionBook
- Fire support base
- Fluidized bed
- Football
- Footbridge
- Foreign body
- Framebuffer
- FreeBASIC
- Fremont Bank
- Friendship book
- Frostbite (game engine)
- Full-back (association football)
- Fullback (American football)
- F♭ (musical note)
- Honda Civic (ninth generation)
- Hyundai FB
- Meta Platforms
- Roary the Racing Car