DAA has multiple meanings, including:
- Danmarks Adels Aarbog, (Yearbook of the Danish Nobility), a genealogical publication
- Data access arrangement
- Data Authentication Algorithm
- Decimal Adjust after Addition, an Intel 80x86 processor instruction
- Department of Administrative Affairs, fictional department in Yes Minister
- Designated Approving Authority, an individual who provides oversight of an IT environment
- Detect and Avoid, a set of technologies designed to avoid interference of UWB upon other networks
- Direct Access Archive, a file format for disk images
- Direct anonymous attestation
- Disabled Artists Association of Ireland, of which Christy Brown was the most notable member
- Dominion Automobile Association, a Canadian motorists' association.
- Dubai American Academy, an educational institute located in Dubai, United Arab Emirates
- Dublin Airport Authority
- Days After Anthesis