Other
- DAC (vehicle manufacturer), a Romanian truck manufacturer
- Deputy Assistant Commissioner, a rank in the London Metropolitan Police
- Decitabine, or 5-aza-2'-deoxycytidine, a DNA-demethylating agent
- Deferred Acquisition Costs, in the insurance industry, when a company defers the sales costs that are associated with acquiring a new customer over the term of the insurance contract
- Districtus Austriae Controllatus, a classification for Austrian wine
- Star Trek DAC, a Star Trek video game
- Shahjalal International Airport (IATA airport code: DAC) in Dhaka, Bangladesh
- Defense Ammunition Center in McAleseter, Oklahoma
- Defense Acquisition Council, responsible for purchases related to the Indian Army
- Dac, the fictional Mon Calamari homeworld
- Department of the Army Civilians Civilian Personnel of Department of the Army, USA
- Diocesan Advisory Committee for the Care of Churches (DAC), an organisation in each Church of England diocese
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