DA
- da – (s) Danish language (ISO 639-1 code) – deca
- DA – (s) Denmark (FIPS 10-4 country code) – (i) Debtors Anonymous – (i) U.S. Department of the Army – District Attorney
- DAB – Digital Audio Broadcasting
- DACT – (i) Data Automated Communications Terminal – Dissimilar Air Combat Training
- DADVSI – (i) Loi sur le droit d’auteur et les droits voisins dans la société de l’information (French, "Law on copyrights and related rights in the information society")
- DAES – (i) Defence Acquisition Executive Summary – (UK MoD) Directorate of Analysis, Experimentation and Simulation
- DAF – (a) Dissolved Air Flotation, a technique used in water treatment
- DAFIF – (a) Digital Aeronautical Flight Information File
- DAK – (a) Disney's Animal Kingdom
- DA&M – (i) (U.S.) Director, Administration & Management
- dan – (s) Danish language (ISO 639-2 code)
- DAO – (i) Division Ammunition Officer
- DAQ – (p) Data acquisition – (i) Delivered Audio Quality
- DARE – (a) Drug Abuse Resistance Education
- DARO – (i/a) (U.S.) Defense Airborne Reconnaissance Office
- DARPA – (a) U.S. Defense Advanced Research Projects Agency
- DART – (a) Disaster Assistance Response Team – Dublin Area Rapid Transit
- DAS – (a) Defensive Aids Suite
- DASD – (i) (U.S.) Deputy Assistant Secretary of Defense
- DASL – (i) Datapoint's Advanced System Language
- DAU – (i) (U.S.) Defense Acquisition University
- DAWN – (a) (U.S.) Drug Abuse Warning Network
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