| Abbreviation | Definition |
|---|---|
| HASA | Hopkins Association for Stroke Awareness |
| HASG | Homeopathic Affiliated Study Group |
| HASL | Handicapped Awareness Support League |
| HATS | Highlands Against Tobacco and Smoking |
| HAVEN | Help A Village Emerge New |
| HAY | Hunger Action for Youth |
| HBA | Home Baking Association |
| HBA | Home Builders Association |
| HBC | Hepatitis B Coalition |
| HBC | Homes for Black Children |
| HBI | Heartbeat International |
| HBLI | Hispanic Border Leadership Institute |
| HBOCF | Hereditary Breast and Ovarian Cancer Foundation |
| HBS | Housing Bureau for Seniors |
| HC | Holland Chapter |
| HCA | Handicap Children's Association |
| HCA | Hawaii Conservation Alliance |
| HCA | Holiday Camp Association |
| HCA | humanitarian and civic assistance |
| HCB | Harvard Club of Boston |