| Abbreviation | Definition |
|---|---|
| BTTO | Berkley Trilene TransOptic mono-filament line |
| BTTO | Bier Trinker Team Oberhausen |
| BTTU | Balkan Table Tennis Union |
| BTW | Below The Waist |
| BTW | Big Time Wrestling |
| BUC | Buccaneer |
| BUCS | Tampa Bay Buccaneers |
| BUDA | Boston Ultimate Disc Alliance |
| BUDS | Beach Ultimate Discipline Strategy |
| BUFF | Basketball's Ultimate Fun Fellowship |
| BUG | Backpackers Ultimate Guide |
| BUG | Backpacker's Ultimate Guide |
| BUG | Bicycle Users Group |
| BUI | Bass Understand Instincts |
| BUI | Boxing Union of Ireland |
| BULA | Beach Ultimate Lovers Association |
| BUMP | Birmingham Urban Mountain Pedalers |
| BUP | Breaking Up a Pass |
| BURHA | Bet U Really Hate Arsenal |
| BUSA | British Underwater Sports Association |