Derek "DK" Kitson, a character in the television series Third Watch, played by Derek Kelly
Dark Kingdom (professional wrestling), a professional wrestling stable
Discovery Kids
Music
DK (band), a Soviet rock band
Deekay, a music production team
Danity Kane, an American female music group
Darren Knott, British disc jockey and record producer
Dave Koz, American saxophonist
Dead Kennedys, American punk band
Other media
Diels–Kranz numbering, a standard system for referencing the works of the pre-Socratic philosophers
Donkey Kong (character), a video game character
Diddy Kong, a video game character
Dixie Kong, a video game character
DistroKid, an American independent digital music service
Businesses and organizations
DK (publisher) (Dorling Kindersley), an international book publisher
Democratic Coalition (Hungary), a political party in Hungary
Design School Kolding (Danish: Designskolen Kolding)
Digital Keystone, a technology company in Mountain View, California
Digital Kitchen, a creative digital agency with offices in Seattle, Chicago, and Los Angeles
Dravidar Kazhagam, a political party in India
Eastland Air (1991-2003, IATA airline code DK), an Australian airline
German Banking Industry Committee (German Die Deutsche Kreditwirtschaft)
Sunclass Airlines (IATA airline code DK), a Danish airline
Delek US, NYSE ticker symbol DK, a downstream energy company
People
DK (born 1997), South Korean singer, a member of band Seventeen (South Korean band)
DK Metcalf (born 1997), American football wide receiver
Darryl Kile (1968–2002), American professional baseball pitcher
Donna Karan (born 1948), fashion designer and creator of the DKNY label
Dinesh Karthik (born 1985), Indian cricketer
Keiichi Tsuchiya, known as the Drift King for his nontraditional use of drifting in non-drifting racing events and his role in popularizing drifting as a motorsport
Places
Denmark (ISO 3166-2 country code DK, licence plate code DK)
.dk, the country code top-level Internet domain for Denmark
Dakshina Kannada, a district in Karnataka, India
Democratic Kampuchea, name of present-day Cambodia from 1975 to 1979
Dickinson County, Kansas, which uses the county code DK
Dolný Kubín, a town in Slovakia and seat of the eponymous district which uses the code DK
In science and technology
Decikelvin (dK), an SI unit of thermodynamic temperature
DK (automobile), a Danish automobile from the early 1950s