FB
- Facebook, An on-line social network
- FBCB2 or FBCB2 – (p) Force XXI Battle Command, Brigade-and-Below
- FBCS – (i) Fellow of the British Computer Society
- FBI – (i) Federal Bureau of Investigation
- FBIS – (i) Foreign Broadcast Information Service
- FBIDST – (i) Fellow of the British Institute of Dental and Surgical Technologists
- FBM – (s) Board foot
- FBR
- (i) Fast Breeder Reactor
- Foundation for Biomedical Research
- Friedman, Billings, Ramsey (now known as Arlington Asset Investment)
- FBS
- Federal Bureau of Statistics (Pakistan)
- Fetal bovine serum
- Football Bowl Subdivision (U.S. college football)
- Fukuoka Broadcasting Corporation
Read more about this topic: List Of Acronyms And Initialisms: F