| Abbreviation | Definition |
|---|---|
| AYSA | Ashwaubenon Youth Soccer Association |
| AYSA | Auburn Youth Soccer Association |
| AYSF | APEC Youth Science Festival |
| AYSF | Atlanta Youth Soccer Foundation |
| AYSM | Arab Youth Startup Marketplace |
| AYSO | American Youth Soccer Organ |
| AYSO | American Youth Soccer Organization |
| AYSO | American Youth Symphonic Orchestra |
| AYSO | Amsterdam Youth Symphony Orchestra |
| AYSRH | Adolescent and Youth Sexual and Reproductive Health |
| AYSRH | Adolescent Youth Sexual Reproductive Health |
| AYT | Actor's Youth Theatre |
| AYU | Arab Youth Union |
| AYUDA | American Youth Understanding Diabetes Abroad |
| AYUSH | all youth and usual status health |
| AYW | AAP Youth Wing |
| AYW | Adirondack Youth Winds |
| AYW | Alliance Youth Works |
| AYY | American Youth Yoga |
| AZYC | Australasian Zionist Youth Council |