| Abbreviation | Definition |
|---|---|
| AYCC | Australian Youth Climate Coalition |
| AYCE | Alberta Youth Council on the Environment |
| AYD | Academic Youth Development |
| AYD | Advancing Youth Development |
| AYD | Allegheny Youth Development |
| AYD | American Youth for Democracy |
| AYD | Arab Youth Directory |
| AYD | Asian Youth Day |
| AYD | Austin Youth Development |
| AYE | APEX Youth Escape |
| AYEC | Adaklu Youth Education Committee |
| AYEC | Alberta Youth Entrepreneur Camp |
| AYEC | Alberta Youth Entrepreneurial Camp |
| AYEC | Alberta Youth Entrepreneurship Camp |
| AYEC | Atlantic Youth Environmental Council |
| AYEDI | Afghan Youth Engagement and Development Initiative |
| AYEN | Algoma Youth Engagement Network |
| AYES | African Youth Entrepreneurship Society |
| AYES | Automotive Youth Educational System |
| AYF | Admina Youth Foundation |