DD

DD, dd, or other variants may refer to:

Arts and entertainment

 * "D.D.", track from the 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
 * Dhivya Dharshini, Indian television host and actress, known as DD, see Koffee With DD
 * 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
 * DD Returns (2023), the third film in the Dhilluku Dhuddu series
 * "Double D'z" (2022), a song from Elevation (Black Eyed Peas album)
 * Edd, commonly known as Double-D, a character from Ed, Edd n Eddy

Business

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

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)
 * Daman and Diu, a former union territory of India, now part of Dadra and Nagar Haveli and Daman and Diu

Computing

 * , an 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
 * d.d. or D.D., a type of abbreviaton in Bosnian language and Croatian language for Joint-stock company means "dioničko društvo"

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, former 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
 * Daniel Defense, a firearms manufacturer
 * 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