HDA

HDA may refer to:

Computing

 * Intel High Definition Audio
 * OPC Historical Data Access
 * /dev/hda, 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