| Acronym | Definition |
|---|
| HDA | High Definition Audio |
| HDA | Help Desk Analyst |
| HDA | Health Development Agency (UK NHS) |
| HDA | Hispanic Dental Association |
| HDA | Hexamethylene Diamine |
| HDA | Helideck Assistant (oil production) |
| HDA | Head Disk Assembly |
| HDA | Moto Honda da Amazonia (Brazilian motorcycle company) |
| HDA | Horizontal Distribution Area |
| HDA | Hybrid Digital-Analog |
| HDA | Holistic Dental Association |
| HDA | Higher Duties Allowance (Australia; pay for performing duties above employed position) |
| HDA | High Density Area |
| HDA | Helper Dependent Adenovirus (vectors) |
| HDA | High Density Alloy |
| HDA | Hall of Distinguished Alumni (Rutgers University; New Brunswick, NJ) |
| HDA | Hawaii Department of Agriculture |
| HDA | Hawaii Dental Association |
| HDA | Hard Disk Assembly |
| HDA | Hampshire Deaf Association (UK) |
| HDA | Hometown Democracy Amendment |
| HDA | Humanitarian Daily Rations |
| HDA | Health Disability Advocates (Chicago, IL) |
| HDA | Hard Decision-Aided |
| HDA | Hardwood Distributor's Association |
| HDA | Hemispherical Dielectric Antenna |
| HDA | Hierarchical Decoding Algorithm |
| HDA | Heads, Actuator, Frame and Discs |
| HDA | Historian Data Access |
| HDA | High Definition Amplifier |
| HDA | Hot Dipped Aluminized paint |