| Abbreviation | Definition |
|---|---|
| BMTA | British Motor Trade Association |
| BMWMOA | BMW Motorcycle Owners of America |
| BMX | Bicycle Motorcross |
| BNIB | Brand New In Box |
| BNIP | Brand New In Packet |
| BNWB | Brand New Without Box |
| BOM | Book Of the Month |
| BOOB | Babes On Outrageous Bikes |
| BOOB | Bikers Offering Options to Bikers |
| BOS | British Origami Society |
| BOTW | Breath Of The Wild |
| BPCS | Blue Persian Cat Society |
| BPP | British Packet Postage |
| BPPI | Balai Penelitian Pemuliaan Ikan |
| BRAD | Beta Reader Appreciation Day |
| BRCA | British Radio Car Association |
| BRD | Bumper Retrieving Dog |
| BRDN | BaroneRosso Day North |
| BRMC | Black Rebel Motorcyle Club |
| BRMC | British Racing Mechanics Club |