| Abbreviation | Definition |
|---|---|
| BRBR | Big Rocky and Bumpy Ride |
| BRC | Bicycle Rain Canopy |
| BRC | Brothers Rugby Club |
| BRCE | Bicycle Rain Canopy Equipment |
| BRD | Blue Ribbon Downs |
| BRDC | British Racing Drivers' Club |
| BRDL | Bridle |
| BRM | Burbank Red Machines |
| BRO | Brooklyn Dodgers |
| BRP | Basic Role Playing |
| BRR | Bike Ride To Rippey |
| BRR | Buck Rope Race |
| BRS | Bear Retardant Suit |
| BRS | Brantford Red Sox |
| BRSA | Bow River Swim Association |
| BRSC | Blue Ridge Ski Council |
| BRV | Blue Ridge Voyageurs |
| BRW | Benchmark Risk Weight |
| BRYC | Braddock Road Youth Club |
| BRYH | Black River Youth Hockey |