| Abbreviation | Definition |
|---|---|
| BR | Barrel Racing |
| BR | Battle Race |
| BR | Before Restart |
| BRAC | Bicycle Racing Association of Colorado |
| BRACE | Bracing |
| BRBF | Buckling restrained braced frame |
| BRBF | Buckling Restrained Bracing Frame |
| BRC | british racing cyle |
| BRCC | Berkeley Racing Canoe Center |
| BRD | Backpack Racing Development |
| BRD | BallRacing Developments |
| BRD | Blue Ribbon Downs |
| BRDC | British Racing Drivers' Club |
| BRG | BMX Racing Group |
| BRG | Boneout Racing Group |
| BRIF | Barrel Racing Incentive Fund |
| BRIT | British Racing Injured Troops |
| BRL | Bagger Racing League |
| BRL | Bicycle Racing League |
| BRM | Beyond Race Magazine |