| Abbreviation | Definition |
|---|---|
| IYYAD | International Youth Young Adult Department |
| JAJYC | J Ashburn Jr Youth Center |
| JASMYN | Jacksonville Area Sexual Minority Youth Network |
| JAY | Just Another Youth |
| JBYM | Jungle Breezes Youth Ministries |
| JCTA | Juventud Cristo Te Ama (Spanish: Christ Loves Youth) |
| JCY | Jewish Center Youth |
| JFY | Julia Farr Youth |
| JLA | Junior League of Atlanta |
| JOY | Jasmyns Out Youth |
| JOY | Jasmyn's Out Youth |
| JOY | Jesus Other Youth |
| JOY | Jesus Outstanding Youth |
| JOY | Joint Operation Youths |
| JOY | Junior Orthodox Youth |
| JOY | Just Older Youths |
| JOY | Just Over Youth |
| JPY | Japanese participating youth |
| JRBG | Junior Researchers in-Burns Group |
| JSYR | Jersey Shore Youth Rugby |