Dek or DEK may refer to:

• Dek language
• Dek Island, Ethiopia
• Dek (news), subhead
• Dek, a proposed name for digit 10 (↊) in duodecimal
• DEK (gene), a human gene
• Dek, Qazvin, a village in Iran
• German Evangelical Church Confederation (German: Deutscher Evangelischer Kirchenbund; 1922–1933)
• German Evangelical Church in Bohemia, Moravia and Silesia
• Deutsche Einheitskurzschrift, a German stenography system
• Democratic National Party (Cyprus), a Greek Cypriot political party
• Diethyl ketone, a flammable chemical
• Donald Ervin Knuth, an American computer scientist, mathematician, and professor
• Dek (number), the 10th number in the Dozenal number system.

This disambiguation page lists articles associated with the title DEK.
If an internal link led you here, you may wish to change the link to point directly to the intended article.