BSL
- Association for Symbolic Logic
- Bachelor of Science in Law
- Bangladesh Student League
- Basketball Super League
- Basketball Super League (North America)
- Bhusaval Junction railway station
- Bhutanese Sign Language
- Biosafety level
- Black Star Line
- Blood sugar level
- BlueScope Steel Limited
- Bokaro Steel Plant
- Boost Software License
- Bootstrap loader
- Boyne Smelters Limited
- Breed-specific legislation
- British School of Lomé, Togo
- British Sign Language
- Broad Street Line
- Brookdale Senior Living
- Brunei Super League
- Bulgarian Sign Language
- Bulletin de la Société de Linguistique de Paris
- Business Source License
- EuroAirport Basel Mulhouse Freiburg
- Israeli Basketball Super League
- Metroid Fusion
- Tata Steel BSL
- Transport Phenomena (book)