| Abbreviation | Definition |
|---|---|
| GYA | Greater Youngstown Area |
| GYC | Greater Yellowstone |
| GYD | Graveyard |
| H-1B | US employment visa |
| HA | Highway Agency |
| HABC | Housing Authority of Baltimore City |
| HACA | Housing Authority of the City of Austin |
| HACA | Housing Authority of the County of Alameda |
| HACB | Housing Authority of the City of Beaumont |
| HACB | Housing Authority of the County of Beaver |
| HACB | Housing Authority of the County of Butte |
| HAER | Historical Architectural Engineering Report |
| HAG | Homeless Assistance Grants |
| HAH | Hide Away Hills |
| HAPPY | Holiday Activities Partnership Project for Youths |
| HASA | HIV AIDS Services Administration |
| HASAP | HIV AIDS Support and Advocacy Programme |
| HASAP | HIV and AIDS School Awareness Program |
| HASAP | Houston Area Substance Abuse Program |
| HAT | Hinte Anderson Trail |