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Digital Equipment Corporation was an American company in the computer industry and a leading vendor of computer systems, software and peripherals from the 1960s to the 1990s. Also known as DEC ^[1] and using the trademark DIGITAL, its PDP and VAX products were arguably the most popular minicomputers for the scientific and engineering communities during the 1970s and 1980s.

From 1957 until 1992 its headquarters was located in an old wool mill in Maynard, Massachusetts. DEC was acquired in June 1998 by Compaq, which subsequently merged withHewlett-Packard in May 2002. Some parts of DEC, especially the compiler business and theHudson, Massachusetts facility, were sold to Intel.

Digital Equipment Corporation should not be confused with the unrelated companies Digital Research, Inc or Western Digital (despite the latter manufacturing the LSI-11 chipsets used in DEC's low end PDP-11/03 computers).