BSF
- BSF (time service)
- Ballerup-Skovlunde Fodbold
- Basilar skull fracture
- Bean Scripting Framework
- Bible Study Fellowship
- Bibliothèques Sans Frontières
- Biosand filter
- Biosciences Federation
- Bit Scan Forward
- Black Sea Fleet
- Black Sea Forum for Partnership and Dialogue
- Black Soldier Fly
- Boies Schiller Flexner LLP
- Bootstrapping Server Function
- Border Security Force
- Boysetsfire
- Bradshaw Army Airfield
- Brandy Station Foundation
- British Skin Foundation
- British Softball Federation
- British Standard Fine
- Building Schools for the Future
- Bund Schweizerischer Frauenvereine
- Segelföreningen i Björneborg
- United States – Israel Binational Science Foundation
- Venezuelan bolívar