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 Defensive counter air (Défense contre les aéronefs), French term for air defense Deputy Commandant for Aviation, principle 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 the 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 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