| Abbreviation | Definition |
|---|---|
| HACT | Housing Associations Charitable Trust |
| HACU | Hispanic Association Of Colleges And Universitites |
| HACU | Hispanic Association Of Colleges Universities |
| HADA | Houston Art Dealers' Association |
| HAI | Helicopter Association International |
| HAL | Housing Association Leasing |
| HAMS | Holland America Music Society |
| HAPA | Hispanic Association for Professional Advancement |
| HASL | Hawaii Association of School Librarians |
| HBA | Houston Bar Association |
| HCCLA | Harris County Criminal Lawyers Association |
| HCIMA | Hotel and Catering International Management Association |
| HCPC | Health and Care Professions Council |
| HCRA | Halifax Citadel Regimental Association |
| HCRA | Heritage Community Recreation Association |
| HCSSA | Harvard Chinese Students And Scholar Association |
| HCSSA | Harvard Chinese Students And Scholars Association |
| HDI | Help Desk Institute |
| HDMA | Healthcare Distribution Management Association |
| HDRG | Heavy Duty Remanufacturing Group |