| Abbreviation | Definition |
|---|---|
| HNA | Hazen's Notch Association |
| HNA | Holistic Networkers' Association |
| HNAA | Hilltowns Natural Areas Alliance |
| HNAF | Himalayan Nature and Adventure Foundation |
| HNAF | Historical and Nautical Archaeology Foundation |
| HNBA | Hispanic National Bar Association |
| HNBF | Hispanic National Bar Foundation |
| HNCA | Hmong Nature Conservancy Activity |
| HNO | Humanitarian Needs Overview |
| HNRA | Historic National Road Alliance |
| HO | Humanitarian Organization |
| HOA | Heart Of Alabama Combined Federal Campaign |
| HOAF | Heart Of America Foundation |
| HOAS | Horn of Africa Services |
| HOD | House of Delegates |
| HOH | Home Of Hope |
| HOM | Hospice Of Michigan |
| HOME | Homes Open For Ministry Encouragement |
| HOME | House Of Modification Examples |
| HOO | Heart Of Omega |