BSU
- BISU Union
- Baku State University
- Ball State University
- Baluchistan States Union
- Bangladesh Students Union
- Baptist Student Union
- Batangas State University Apolinario R. Apacible School of Fisheries
- Bath Spa University
- Behavioral Analysis Unit
- Behavioral Science Unit
- Beijing International Studies University
- Beijing Sport University
- Belarusian State University
- Bemidji State University
- Benguet State University
- Boise State University
- Bowie State University
- Bridgewater State University
- Britannia Staff Union
- British Seafarers' Union
- Bukidnon State University
- Bulacan State University
- Classifying space for SU
- Classifying space for SU(n)
- Federal Bureau for Maritime Casualty Investigation
- Federal Bureau of Investigation