HDAA
| Acronym | Definition |
|---|---|
| HDAA | High Definition Authoring Alliance (Sonic Solutions) |
| HDAA | Health Data for All Ages (US CDC) |
| HDAA | Help Desk Association Australasia |
| HDAA | Her Death and After (band) |
| HDAA | Hull and District Angling Association (UK) |
| HDAA | Home Domain Allocation Agency |