dec

• December, the 12th month and final month of the year in the Julian and Gregorian calendars
• Decade (log scale), a unit for measuring ratios on a logarithmic scale
• Declination, a term from astronomy
• Diethylcarbamazine, an anti-parasite drug
• Diethyl carbonate, an organic solvent
• Diplome d’Études Collegiales, French name for Diploma of College Studies, a college studies diploma issued in Quebec
• Oratorical Declamation, an event in competitive debate
• Display Energy Certificate, a UK requirement to show a certificate rating energy performance in public buildings
• Direct energy conversion, a scheme for power extraction from nuclear fusion
• An abbreviation for decimal, for example in ASCII charts
• Abbreviation for decathlon, an Olympic athletics event

• Delaware Electric Cooperative
• Department of Education and Communities (New South Wales), Australia
• Department of Environment and Conservation (New South Wales), Australia
• Department of Environment and Conservation (Western Australia), Australia
• New York State Department of Environmental Conservation, New York, United States
• Dheeraj and East Coast LLC, Dubai
• Digital Equipment Corporation, a defunct computer and technology company
• Disasters Emergency Committee, coordinates fifteen disaster relief charities in the United Kingdom
• Distance Education Council, former body for open and distance education, see Distant Education Bureau
• Dubai Economic Council, a policy-making body of the government of Dubai

• Declan Donnelly (from Ant & Dec), a United Kingdom television presenter
• Francis E. Dec (1926–1996), American outsider writer and lawyer

• Deč, a village in Serbia
• Decatur Airport, Decatur, Illinois (IATA airport code DEC)
• Derwent Entertainment Centre, an entertainment centre in Hobart, Australia
• Doncaster Education City, a development in South Yorkshire

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