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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

DuPont, which trades shares on the New York Stock Exchange as DD
Dunkin' Donuts, a company
Data Disc
Dioničko društvo (d.d. or D.D.), a type of Joint-stock company in Bosnian and Croatian languages

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

<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

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

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