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) The following is a list of characters featured in ''The Saga of Seven Suns'', a series of science fiction novels written by Kevin J. Anderson from 2002 to 2008. For characters in the sequel trilogy '' The Saga of Shadows'', see List of ''The Saga ...

, 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