HDA
HDA may stand for:
- HDA is the ICAO code for Dragonair
- Head and Disk Assembly of a Winchester (sealed) hard disk drive
- Helicase-dependent amplification, a technique to copy DNA
- Health Development Agency
- Health Devices Alerts
- Hidden Falls
- PC integrated High Definition Audio
- High density amorphous ice, a phase of water
- Hispanic Dental Association
- Home Designers Association