HDA may refer to:
Computing
- Intel High Definition Audio
- OPC Historical Data Access
- , see Device file § Naming conventions
- Head and Disk Assembly of a Winchester disk
Science and mathematics
- Helicase-dependent amplification
- High density amorphous ice
- Higher-dimensional algebra
Other uses
- Dragonair
- Ein Shemer Airfield
- Hardlines Distribution Alliance, a hardware store retailers' cooperative
- Hockey Diversity Alliance
- The Holy Demon Army
- Huntington's Disease Association
- HiTeC Digital Audio, former name of Auzentech