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 The Housing Delivery Authority in New South Wales, Australia Huntington's Disease Association HiTeC Digital Audio, former name of Auzentech