BSL may refer to:
Business
- Black Star Line, a former shipping line owned by Marcus Garvey
- BlueScope Steel Limited, an Australian-based flat product steel producer
- Boyne Smelters Limited, an Australian-based aluminium smelter company
- Brookdale Senior Living, a U.S. company that operates senior residences
Education
- Bachelor of Science in Law, an academic degree
- British School of Lomé, Togo, a school in Togo, West Africa
Linguistics
Publications
- Bulletin de la Société de Linguistique de Paris, an academic journal published by the Société de Linguistique de Paris
- Bulletin of Symbolic Logic, from the Association for Symbolic Logic
- Transport Phenomena (book), an engineering textbook also known by its authors' initials (Bird, Stewart, and Lightfoot)
Science and computing
- Biosafety level or biohazard safety level, a set of biocontainment precautions
- Blood sugar level
- Boost Software License, a license popular for C++ projects
- Bootstrap loader, the software involved in booting a computer
- Business Source License, a source-available software license
Sports
- Basketball Super League (Turkish: Basketbol Süper Ligi), Turkey's premier men's basketball league
- Basketball Super League (North America), North American basketball league
- Israeli Basketball Super League, a former name of the Israeli Basketball Premier League
Transportation
- EuroAirport Basel Mulhouse Freiburg (IATA airport code)
- Broad Street Line, a subway line in Philadelphia, Pennsylvania, US
Other uses
- Bangladesh Student League, a students' political organisation in Bangladesh
- Biologic Space Laboratories, the location of the Metroid Fusion video game
- Beam stage loader, a machine that forms part of a longwall mine
- Breed-specific legislation, a type of law to prohibit or restrict the keeping of particular breeds or types of dog
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