| Acronym | Definition |
|---|
| HADC➣Housing Authority of Dekalb County (Decatur, GA) |
| HADC➣Haymarket Affair Digital Collection (Chicago Historical Society) |
| HADC➣Holloman Air Development Center |
| HADC➣Heart of America Dance Centre (Lees Summit, MO) |
| HADC➣Hough Area Development Corporation (est. 1968; Cleveland, OH) |
| HADC➣Honorary Aide-de-Camp (French: Honorary Camp Assistant; Canada) |