BSU

• BISU Union
• Baku State University
• Ball State University
• Baluchistan States Union
• Bangladesh
• Bangladesh Students Union
• Baptist Student Union
• Batangas State University Apolinario R. Apacible School of Fisheries
• Bath Spa University
• Behavioral Analysis 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
• Federal Bureau for Maritime Casualty Investigation
• Federal Bureau of Investigation
• three-letter acronym