BSA may refer to:

• Basketball South Africa
• Bearing Specialists Association, an American trade association
• Belarusian Socialist Assembly
• Bibliographical Society of America
• Birmingham Small Arms Company, UK manufacturer of firearms and vehicles
• Black Sky Aerospace, an Australian aerospace company
• Black Socialists in America
• Boston Society of Architects
• Botanical Society of America
• Boy Scouts of America
  • Scouts BSA, the flagship program
• British Social Attitudes Survey
• British Sandwich & Food to Go Association
• British Science Association
• British Sociological Association
• British Speleological Association
• British Stammering Association
• Broadcasting Service Association, the former name of the Australian radio network Macquarie Media
• Broadcasting Standards Authority, a New Zealand statutory authority
• BSA Company, motorcycle manufacturer
• BSA motorcycles, made by the Birmingham Small Arms Company Limited
• The Software Alliance, a trade group established by Microsoft and formerly called Business Software Alliance
• BSA Manufacturing, a Malaysian manufacturer of aluminum alloy wheels
• Business Services Association, of UK service providers

• Baltimore School for the Arts
• Birmingham School of Acting
• British School at Athens

• Behavioral systems analysis
• Bis(trimethylsilyl)acetamide
• Body surface area
• Bovine serum albumin
• Broad-spectrum antiviral drug

• Bank Secrecy Act, US
• Bilateral Security Agreement, US umbrella for military cooperation
• Bosnian Serb Army, the Army of Republika Srpska, the former armed forces of the Republika Srpska
• Bachelor of Science and Arts (BSA)
• Bachelor of Science in Accountancy (BSA)
• Bachelor of Science in Agriculture (B.S.A.)
• Bosaso Airport, an airport in Puntland (IATA airport code BSA)
• British Soap Awards, an awards ceremony in the UK
• BSA, a brand of bicycles produced by Tube Investments of India
• Business systems analyst
• Blue Dragon Series Awards, an annual award ceremony in South Korea
• Bharatiya Sakshya Act, 2023, Indian evidence act

• All pages with titles beginning with BSA
• All pages with titles containing BSA