| Abbreviation | Definition |
|---|---|
| BYF | Benicia Youth Football |
| BYF | Bethel Youth Facility |
| BYF | Boston Youth Fund |
| BYFC | Bangladesh Youth First Concerns |
| BYFC | Bassingbourn Youth Football Club |
| BYFC | Bristol Youth Football and Cheer |
| BYG | Big Youth Group |
| BYG | Briarwood Youth Group |
| BYG | Bridge Youth Group |
| BYH | Baltimore Youth Hockey |
| BYH | Bethlehem Youth Hockey |
| BYH | Brookline Youth Hockey |
| BYHRS | Bahrain Youth Human Rights Society |
| BYI | Brown Youth Initiative |
| BYKE | Baltimore Youth Kinetic Energy |
| BYL | Buffalo Youth Lacrosse |
| BYLA | Bethel Youth Lacrosse Association |
| BYLA | Bronxville Youth Lacrosse Association |
| BYLA | Burlington Youth Lacrosse Association |
| BYLP | Backstory Youth Leadership Program |