# 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
* Dhivyadharshini, Indian television host and actress, known as 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
* Dhilluku Dhuddu franchise, Indian film series
** Dhilluku Dhuddu (2016), the first film in the Dhilluku Dhuddu series
** Dhilluku Dhuddu 2 (2019), the second film in the Dhilluku Dhuddu series
** DD Returns (2023), the third film in the Dhilluku Dhuddu series
** DD Next Level (2025), upcoming film and the fourth film in the Dhilluku Dhuddu series
* "Double D'z" (2022), a song by Black Eyed Peas from Elevation
* 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 coffee and doughnut company
* Data Disc
* Dioničko društvo (d.d. or D.D.), a type of Joint-stock company in Bosnian and Croatian languages

## 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

## Science and technology
### Computing

* <dd></dd>, 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

## 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
* Double Diamond Burton Pale Ale