| Abbreviation | Definition |
|---|---|
| BRO | BMX Riders Organization |
| BS | Bite Stamps |
| BSA | Baby Sitters Anonymous |
| BSA | Baby Sitters of America |
| BSAC | British Sub-Aqua Club |
| BSC | Baby Sitters Club |
| BSC | Beer Swilling Club |
| BSCC | British Shorthair Cat Club |
| BSD | Black Spiral Dancer |
| BSFC | Boston Scottish Fiddle Club |
| BSH | Budgerigar Society Holland |
| BSM | British School of Motoring |
| BSME | Baltimore Society of Model Engineers |
| BSSM | Bishojou Senshi Sailor Moon |
| BTD | Ballons Tower Defence |
| BTD | Balloons Tower Defence |
| BTW | British Traditional Wicca |
| BTW | Brothers of the Third Wheel |
| BUDC | Banstead Underwater Diving Club |
| BUDC | Birmingham University Diving Club |