| Abbreviation | Definition |
|---|---|
| HACA | Historical Armed Combat Association |
| HACB | Hampshire Association for the Care of the Blind |
| HACU | Hispanic Association of Colleges and Universities |
| HADF | Hill Area Development Foundation |
| HAF | Heart of America Foundation |
| HAF | Hospice Angel Flight |
| HAFA | Hmong American Farmers Association |
| HAFFA | Hongkong Association of Freight Forwarding Logistics |
| HAFFA | Hongkong Association of Freight Forwarding & Logistics |
| HAFFA | Hongkong Association of Freight Forwarding and Logistics |
| HAFFA | Hongkong Association of Freight Forwarding And Losgistics |
| HAI | Health Action International |
| HAIN | Heavenly Angels In Need |
| HAM | Health Action MANA (Midwives Alliance of North America) |
| HAMS | Hillside Association of Music Supporters |
| HAOA | Histiocytosis Association Of America |
| HAPC | Help A Poor Child |
| HAPPI | Horse And Petting Pal Interaction |
| HARP | Humanitarian Assistance Response Plan |
| HAS | Houston Audubon Society |