| Abbreviation | Definition |
|---|---|
| BWRT | Brazil World Rally Team |
| BYC | Back Yard Cricket |
| BYC | Balboa Yacht Club |
| BYC | Barbados Yacht Club |
| BYC | Bayview Yacht Club |
| BYC | Bellingham Yacht Club |
| BYC | Benicia Yacht Club |
| BYC | Berkeley Yacht Club |
| BYC | Beverly Yacht Club |
| BYC | Boston Yacht Club |
| BYC | Breakwater Yacht Club |
| BYC | Bremerton Yacht Club |
| BYC | British Yacht Club |
| BYH | Braintree Youth Hockey |
| BYHO | Braintree Youth Hockey Organization |
| BYOA | Build Your Own Arrow |
| byob | Bring Your Own Bat |
| BYOF | Build Your Own Fish |
| BYOP | Bring Your Own Paint |
| BYOT | Bring Your Own Towel |