| Abbreviation | Definition |
|---|---|
| HYI | Hendrix Youth Institute |
| HYI | Homeless Youth Initiative |
| HYL | Hamburg Youth Lacrosse |
| HYL | Hamden Youth Lacrosse |
| HYL | Hancock Youth Leadership |
| HYL | Helena Youth League |
| HYN | Homeless Youth Network |
| HYNZ | Hindu Youth New Zealand |
| HYO | Harford Youth Orchestra |
| HYO | Hindu Youth Organisation |
| HYO | Huntsville Youth Orchestra |
| HYOC | Hawaii Youth Opera Chorus |
| HYP | Hamilton Youth Poets |
| HYP | Haywood Youth Project |
| HYP | Healthy Youth Partnership |
| HYP | Hoosier Youth Philharmonic |
| HYP | Horizon Youth Programs |
| HYPE | Hayti Youth for Progress and Enrichment |
| HYPE | Helping Youth on the Path to Employment |
| HYPE | Helping Youth Participate and Excel |