| Abbreviation | Definition |
|---|---|
| BTFCU | Building Trades Federal Credit Union (Orange, CA) |
| BTU | Baltimore Teachers Union |
| BTU | Boston Teachers Union |
| BTU | Broward Teachers Union |
| BTWU | Bangladesh Tea Workers Union |
| BTWU | Bharatiya Tea Worker Union |
| BUAV | British Union Against Vivisection |
| BUCF | Banking Union Centre in Frankfurt |
| BUCH | Bulgarian Union of Churches How |
| BUF | British Union of |
| BUF | British Union of Fascists |
| BUH | Battlefords Union Hospital |
| BUH | Battlfords Union Hospital |
| BUJ | Bombay Union of Journalists |
| BUKA | British Union of Karate Associations |
| BUSD | Bellevue Union School District |
| BUSD | Brentwood Union School District |
| BUSU | Brock University Students Union |
| BUSU | Brock University Students' Union |
| BUU | Beijing Union University |