BHA may mean:
- Barbados House of Assembly
- Berkshire Hathaway Assurance
- Beta hydroxy acid
- Broadland Housing Association
- Buddha Air (ICAO airline code: BHA) an airline based in Kathmandu, Nepal
- Bahía de Caráquez (IATA airport code: BHA), Ecuador
- Bottom hole assembly, pipe string end assembly of the drilling rig (crude oil production term)
- Brighton & Hove Albion F.C.
- British Homeopathic Association
- British Horseracing Authority
- British Hospitality Association
- British Humanist Association
- Bush Heritage Australia
- Butylated hydroxyanisole, a food additive
- BHA (for "Butt-Head Astronomer"), a code-name for the Power Macintosh 7100 computer
- Bibliography of the History of Art, a bibliographic database on the history of Western art, produced by Getty Research Institute