DEC, dec or Dec may refer to:
- Deč, a village in Serbia
- Francis E. Dec, a conspiracy theorist
- Decatur Airport, Decatur, Illinois (ICAO airport code)
- December, a month of the year in the Gregorian Calendar
- Decent, average.
- Declan Donnelly (Ant & Dec), a United Kingdom television presenter
- Declination, a term from astronomy
- Department of Environment and Conservation, Australia
- Derwent Entertainment Centre, an entertainment centre in Hobart, Australia
- Diethylcarbamazine, an anti-parasite drug
- Digital Equipment Corporation, a defunct computer and technology company
- Diplome d’Études Collegiales, a college studies diploma issued in Quebec
- Disasters Emergency Committee, coordinates 13 disaster relief charities in the United Kingdom
- Doncaster Education City, a development in South Yorkshire
- New York State Department of Environmental Conservation
- Oratorical Declamation, an event in competitive debate
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