DCA may refer to:
Computers
- Document Content Architecture, an IBM document standard
- Dynamic Channel Allocation/Assignment, in wireless networks
- DTS Coherent Acoustics in DTS (sound system)
Military
- Defence Cyber Agency, a tri-service command of the Indian Armed Forces
- Defense Communications Agency, former name of US Defense Information Systems Agency
- The Defense Cooperation Agreement
- Defensive counter air (Défense contre les aéronefs), French term for air defense
- Deputy Commandant for Aviation, principal advisor on all aviation matters in the United States Marine Corps
- Dual-capable aircraft, used in nuclear sharing
Organizations
- California Department of Consumer Affairs
- Department for Constitutional Affairs of the UK government, 2003-2007
- DCA Design
- Department of Civil Aviation (Australia)
- Department of Civil Aviation (Thailand)
- Digital Communications Associates, US company
- Diyanet Center of America, Lanham, Maryland
- Drum Corps Associates, a governing body of drum corps in North America
- Dundee Contemporary Arts, Scotland
- Namibia Directorate of Civil Aviation
- Christian Democracy for Autonomies, a former political party in Italy
Science and technology
- Detrended correspondence analysis, a statistical technique
- Dichloroacetic acid / dichloroacetate, an organic acid
- Dichloroethanes, organic solvents
- Digitally-controlled amplifier
- Direct coupling analysis, a method for analyzing sequence data in computational biology
- Directional component analysis, a multivariate statistical technique used in the atmospheric sciences
- Drone congregation area, a location where bees gather to mate
Television, film, and music
- Distributors Corporation of America, American film distribution company (1952-1959)
Transportation
- Ronald Reagan Washington National Airport, Arlington County, Virginia, US, IATA code
- Dutch Caribbean Airlines, former Netherlands Antilles airline
Other uses
- Direct corporate access, part of UK Faster Payments Service
- Dollar cost averaging, an investment strategy
- Disney California Adventure, Anaheim, California, US
- Debt Collection Agency, companies specialized in pursuing payments of debts
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