BSB is a three-letter abbreviation that may refer to:

• Bank Services Billing Standard, an international standard related to the structure of electronic bills send by banks to their corporate customers
• Back side bus, a data bus in a computer
• Bank State Branch, a six digit numerical code used within Australia to identify branches of financial institutions.
• Presidente Juscelino Kubitschek International Airport, Brasília, Federal District, Brazil
• Bandar Seri Begawan, Brunei
• Bavarian State Library
• British Satellite Broadcasting
• The Backstreet Boys, an American pop music group
• Brigade Speciale Beveiligingsopdrachten, Dutch special forces
• Bournemouth School, Dorset, England
• British Superbike, a motorcycle racing championship
• British School of Brussels
• Burgerlike Samewerkingsburo, the Afrikaans name for the Civil Cooperation Bureau a covert, apartheid-era special forces unit
• Blood Shot Bill, New Jersey-based rapper / hip-hop artist.

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