| Acronym | Definition |
|---|
| BSU | Ball State University |
| BSU | Boise State University |
| BSU | Bemidji State University |
| BSU | Black Student Union |
| BSU | Bowie State University (Bowie, Maryland) |
| BSU | Boligsparing for Ungdom (Norwegian: Housing Savings for Young) |
| BSU | Brigade de Sûreté Urbaine (French: Urban Police Brigade) |
| BSU | Baptist Student Union (college religious organization) |
| BSU | Bacillus |
| BSU | Benguet State University (Philippines) |
| BSU | Belarusian State University (Minsk, Belarus) |
| BSU | Behavioral Science Unit (FBI) |
| BSU | Base Station Unit |
| BSU | Blood Supply Unit (US DoD) |
| BSU | Balkan Speleological Union (Bulgaria) |
| BSU | Base Service Unit |
| BSU | Beam Steering Unit (sub-system of electronically scanned antenna arrays) |
| BSU | Basic Semantic Unit |
| BSU | Benue State University (Nigeria; est. 1992) |
| BSU | Boat Support Unit |
| BSU | N,N-Bis-Trimethylsilyl-Urea (chemistry) |
| BSU | Bus Switching Unit |
| BSU | Bulk Storage Unit (Military) |
| BSU | Baseband Separation Unit |
| BSU | Beloved Spousal Unit |
| BSU | Bomb Stabilizer Unit |
| BSU | Bukhara State University (Uzbekistan) |
| BSU | Bosch Smoke Unit (fuel engineering) |
| BSU | Biological Survey Unit (USGS Patuxent Wildlife Research Center) |