DAC

Businesses and organisations

DacEasy, originally Dac Software, Inc.
Danish Architecture Centre, an international cultural attraction
Defense Ammunition Center (United States), of the United States Department of Defense
Democratic Action Congress, a political party in Trinidad and Tobago
Designated activity company, a type of company in Ireland
Development Assistance Committee of the Organisation for Economic Co-operation and Development
Direct Action Committee, a British peace campaign 1957–1961
Distributed autonomous corporation, an organization managed by a decentralized computer program
Domain Awareness Center, an anti-crime initiative in Oakland, California, U.S.

Dakota Athletic Conference, in North Dakota and South Dakota, U.S.
Duneland Athletic Conference, in Indiana, U.S.
Daskalakis Athletic Center, an athletic and recreational facility in Philadelphia, Pennsylvania, U.S.
Detroit Athletic Club, in Detroit, Michigan, U.S.
FC DAC 1904 Dunajská Streda, a Slovak football team
Dota 2 Asia Championships 2015 or DAC 2015, a Dota 2 tournament
Dota Auto Chess, a mod within Dota 2 that was the first prominent autobattler

DAC, a form of 7+3 (chemotherapy)
Microsoft Data Access Components, or Windows DAC, a framework of interrelated Microsoft technologies
Diamond anvil cell, a high-pressure device used in geology and engineering
Digital-to-analog converter, a system that converts a digital signal into an analog signal
Direct air capture, to extract carbon dioxide directly from air
Direct Attach Copper, a 10 Gigabit Ethernet connector
Discretionary access control, in computer security
Double-acting Cylinder, a type of pneumatic cylinder
D-acetylcarnitine.

DAC (automobile), a 1922–1923 American car by the Detroit Air-Cooled Car Company
DAC (vehicle manufacturer), a Romanian truck manufacturer
Rocar DAC, a series of Romanian buses and trolleybuses

DAC Air, defunct Romanian airline
Daily Air, a Taiwanese airline, ICAO airline code DAC
Direction de l'Aviation Civile, a government agency of Luxembourg
Dutch Aeroplane Company, manufacturer of the DAC RangeR
Hazrat Shahjalal International Airport, Dhaka, Bangladesh, IATA airport code DAC