DEI is a three-letter acronym. It may refer to one of the following:

  • DEI (Greek national electrical company)
  • FIFA Trigramme for Dutch East Indies
  • Dale Earnhardt, Inc., a current NASCAR team
  • DEI, Dayalbagh Educational Institute, university in Agra, India
  • DEI (Dabney Eats It), the lounge in Dabney House at Caltech. Also serves as Dabney House's motto.
  • Data Expedition, Inc., an enterprise software company that produces software for the data transfer market.
  • Destroy Erase Improve, a 1995 album by Swedish heavy metal band Meshuggah
  • Directed Electronics, Inc., manufacturer of vehicular audio and security systems, including the popular Clifford and Viper car alarm systems.
  • Dutch East Indies, Indonesia when it was still a Dutch Colony
  • Dawat-e-Islami : A non-political Islam preaching organization