| Abbreviation | Definition |
|---|---|
| BASEA | Boston Area Solar Energy Association |
| BASEA | British Airport Services and Equipment Association |
| BASELT | British Association of State English Language Teaching |
| BASES | British Association of Sport and Exercise Sciences |
| BASES | Business Association of Stanford Entrepreneurial Students |
| BASF | Builders Association of South Florida |
| BASHH | British Association for Sexual Health & HIV |
| BASHH | British Association of Sexual Health and HIV |
| BASHP | Bristol Association of Secondary Heads and Principals |
| BASHP | Bristol Association of Secondary Heads and Principles |
| BASI | British Association of Snowsports Instructors |
| BASMA | Bay Area Shiite Muslims Association |
| BASO | Belgian Association for the Study of Obesity |
| BASO | British Association of Surgical Oncology |
| BASO | Builders Association Southern Oregon |
| BASP | British Association of Ski Patrollers |
| BASPA | Black and Azov Seas Ports Association |
| BASRAT | British Association of Sport Rehabilitators and Trainers |
| BASTA | Bell Association to STOP the Abuse |
| BASU | British Association of Softball Umpires |