| Abbreviation | Definition |
|---|---|
| BABY | Brunettes Against Bubblegum Youth |
| BAYB | Baldwin Area Youth Basketball |
| BAYB | Broken Arrow Youth Baseball |
| BAYC | Bay Area Youth Centers |
| BAYFL | Brunswick Area Youth Football League |
| BAYO | Basingstoke Area Youth Orchestras |
| BAYOU | Beginning Agricultural Youth Opportunity Unit |
| BAYS | Baltimore Area Youth Soccer |
| BAYS | Bay Area Youth Sailing |
| BAYS | Bay Area Youth Soccer |
| BAYS | Bay Area Youth Summit |
| BAYS | Boston Area Youth Soccer |
| BB | Boys' Brigade |
| BBBSY | Big Brothers Big Sisters of York |
| BBY | Be Brave Youth |
| BBYG | Bible Baptist Youth Group |
| BBYO | Bnai Brith Youth Organization |
| BCY | Bury Christian Youth |
| BCY | Business Challenge for Youth |
| BCYA | Black Consciousness Youth Of Azania |