DD, dd, or other variants may refer to:

Arts and entertainment

*"D.D.", a track on mixtape ''Echoes of Silence'' by The Weeknd *DD (character), a character in ''The Saga of Seven Suns'' novels by Kevin J. Anderson *DD National or DD1, an Indian national television channel *Dancing Dolls, a Japanese all-female pop group *Daredevil (Marvel Comics character), a Marvel Comics character **Matt Murdock (Marvel Cinematic Universe), the Marvel Cinematic Universe counterpart * Decorative Designers *Donegal Daily, an Irish news website *Doordarshan, a public service broadcaster in India *Erann DD, a Danish singer and songwriter *DD, the production code for the 1966 ''Doctor Who'' serial ''The Tenth Planet''

Business

* DuPont, which trades shares on the New York Stock Exchange as DD * Dunkin' Donuts, a company

Military

* DD tank, an amphibious tank * Dishonorable discharge, a punitive discharge in the U.S. military * DD, the U.S. Navy hull classification for destroyers * DD Form 214, a form used by the U.S. Defense Department

Places

* DD postcode area, in Scotland * .dd, a hypothetical domain name for the German Democratic Republic * Dresden, Germany (license plate code DD)

Science and technology

Computing

* , an HTML element#dd, HTML element for specifying definition data * dd (Unix), a program that copies and converts files and data * Deckadance, a DJ program for Windows and Mac OS X designed by Image-Line * Deployment descriptor, a component in Java Platform, Enterprise Edition applications * Logo for Dolby Digital, audio compression technologies developed by Dolby Laboratories * Double density, a capacity designation on magnetic storage, usually floppy disks * Debian Developer, the traditional full-membership role in Debian

Other uses in science and technology

* Data Deficient, a rating on the IUCN Red List of Threatened Species * Decimal degrees, geographic coordinates shown using decimal fractions * Death domain, a protein-interaction module, a subclass of the death fold protein motif * DD Index, for ''Democracy-Dictatorship Index'' * Abbreviation for dolichospondylic dysplasia, a genetic syndrome * Developmental disability, or developmentally disabled, a diverse group of chronic conditions due to mental or physical impairments arising before adulthood * Deuterium-deuterium fusion, a type of nuclear fusion

Sports

* Delhi Daredevils, former name of Delhi Capitals * Delhi Dynamos FC, an Indian Super League franchise, now Odisha FC

Transportation

* DD tank, an amphibious tank * D-D locomotive, the AAR classification for a railway locomotive with two four-axle bogies * Danish Air Lines, an airline * Invincible D-D, a prototype aircraft * Nok Air, a low-cost airline based in Thailand * Victorian Railways Dd class, a class of steam locomotives in Australia

Other uses

* DD, a brassiere measurement * Dd (digraph), in the Welsh language * Degree of difficulty, in several sports * Demand draft, a negotiable instrument issued by the bank * Deputy Director (disambiguation), a rank in some organizations * Designated driver, a person who remains sober as the responsible driver * Doctor of Divinity, an academic degree * Dine and dash, a form of theft by fraud * Direct debit, a way of paying bills