| Acronym | Definition |
|---|
| HHD | Heavy Heavy Duty |
| HHD | Health and Human Development (Education Development Center, Inc.) |
| HHD | Herbert Hoover Dike (Florida) |
| HHD | Husker Harvest Days (trade show; Nebraska) |
| HHD | Hogshead |
| HHD | Headquarters Detachment |
| HHD | Hybrid Hard Drive (Samsung/Microsoft) |
| HHD | Hailey-Hailey Disease |
| HHD | Hand Held Device |
| HHD | Hypertensive Heart Disease (cardiovascular disorder) |
| HHD | Headquarters & Headquarters Detachment |
| HHD | Hip Hop Discussion (forum) |
| HHD | Happy Hump Day |
| HHD | Hartford Health Department |
| HHD | Hylian Help Desk (website) |