DCT may refer to:

Science and technology DCT (videocassette format), a videocassette format developed by Ampex Discovery Channel Telescope, former name of the Lowell Discovery Telescope, US Dual-clutch transmission, a vehicle technology which allows gears to be selected in fully manual or automatic mode

Biology and medicine Direct Coombs test, used to test for autoimmune hemolytic anemia Distal convoluted tubule, a part of the functional unit of the kidney Dopachrome tautomerase, a human gene

Mathematics Discrete cosine transform, a mathematical transform related to the Fourier transform and widely used in digital data compression Dominated convergence theorem, a central mathematical theorem in the theory of integration first proposed by Henri Lebesgue

Other uses Death Come True, a 2020 adventure video game Director Control Tower, a facility equipped to direct and control a ship's gun battery Discourse-completion task, a pragmatics research method in linguistics Dreams Come True (band), a Japanese band Danescourt railway station (National Rail station code), Wales Divine Command Theory, a moral theory which holds that divine revelation (especially by God) is the basis for morality

See also Motorola DCT2000, a set-top-box device used for receiving digital cable TV