Organizations
- Baltimore School for the Arts
- Bank Secrecy Act
- Bearing Specialists Association
- Belarusian Socialist Assembly
- Bhutan Scouts Association
- Bibliographical Society of America
- Birmingham School of Acting
- Birmingham Small Arms Company, a British manufacturer of military and civilian firearms and vehicles including motorcycles
- Bosnian Serb Army — Army of the Republika Srpska
- Boston Society of Architects, Boston Chapter of the American Institute of Architects (AIA)
- Botanical Society of America
- The Botswana Scouts Association
- Boy Scouts of America
- Brazilian Space Agency
- British School at Athens
- British School of Amsterdam
- British Schools of America
- British Science Association, a trading name for the British Association for the Advancement of Science
- British Sociological Association
- British South Africa Company
- British Speleological Association
- British Stammering Association
- British Stratego Association
- Broadcasting Standards Authority
- Bronx Success Academy, former name of schools (now Success Academy Bronx 1 etc.), part of Success Academy Charter Schools
- Building Societies Association
- Business Services Association, the body representing UK outsourced service providers
- Business Software Alliance
Read more about this topic: BSA