| BSU | Ball State 
| Others |
| BSU | Bangladeshi Students Union
| Others |
| BSU | Baptist Student Union
| Others |
| BSU | Barre Supervisory Union
| Others |
| BSU | Bartholin, Skene, and Urethral glands
| Others |
| BSU | Basankusu, Congo
| Others |
| BSU | Basic Semantic Unit
| Others |
| BSU | Basic Service Unit
| Others |
| BSU | Basic Spatial Unit
| Others |
| BSU | Basic Structural Unit
| Others |
| BSU | Battery Supply Unit
| Others |
| BSU | BEA Smart Update
| Others |
| BSU | Beam Steering Unit
| Others |
| BSU | Been Swagged Up
| Others |
| BSU | Behavioral Science Unit
| Others |
| BSU | Beloved Spousal Unit
| Others |
| BSU | Bemidji State University
| Others |
| BSU | Benue State University, Makurdi.
| Others |
| BSU | Best Summer University
| Others |
| BSU | Better Shape Up
| Others |
| BSU | Betterment Service Unity
| Others |
| BSU | Big Sunday Urban
| Others |
| BSU | Black Student Union
| Others |
| BSU | Black Students United
| Others |
| BSU | Blitz Sonic Ultra
| Others |
| BSU | Blood Stool And Urine
| Others |
| BSU | Blood Supply Unit
| Others |
| BSU | Bluecollar St Univ
| Others |
| BSU | Bluefield State University
| Others |
| BSU | Boise State
| Others |
| BSU | Boise State Boise State University
| Others |
| BSU | Boise State University
| Others |
| BSU | Bomb Squad Unit
| Others |
| BSU | Bomb Stabilization Unit
| Others |
| BSU | Bonita Springs Utilities
| Others |
| BSU | Bosch Smoke Unit
| Others |
| BSU | Bowie State University
| Others |
| BSU | Boy Scout University
| Others |
| BSU | Bremsen Sonderuntersuchung
| Others |
| BSU | Bridgewater State University
| Others |
| BSU | British Standard Unit
| Others |
| BSU | Business Support Unit
| Others |
| BSU | Bypass Switch Unit
| Others |