Several meanings of the acronym BSA are:
- Building Societies Association
- Business Software Alliance
- British School at Athens
- British Sociological Association
- British Society of Audiology
- Basic Skills Agency
- UK Boarding Schools Association
- British Social Attitudes
- British Snowboarding Association
- British Surfing Association
- Birmingham Small Arms Company (motorcycles etc.)
- Blackwell Science Asia
- British Stammering Association
- Boy Scouts of America
- Botanical Society of America
- Boston Society of Architects
- Bovine serum albumin
- Bulgarian Studies Association
- Broadcasting Standards Authority