Dragon Quest, a series of console role-playing games created by Enix (now Square Enix)
Dragon Quest (Video Game), The first game in the series originally released for the Famicom in 1986
DragonQuest, a 1980 role-playing game created by SPI
Businesses
Dairy Queen, a fast food chain
Coastal Air Transport (IATA code DQ)
People
DQ (artist), Danish singer, participant in Eurovision Song Contest 2007
Dan Quayle, American politician
Dulquer Salmaan, Indian actor and singer
Dan Quinn (American football), football coach
In science and technology
HLA DQ, a human leukocyte antigen type protein
Data quality, various measures in information science
Design qualification, part of verification and validation
Digital Intelligence Quotient, a form of intelligence that combines knowledge in information technology and the socio-emotional ability to interact effectively through this medium
Double-ended queue, a data type in computer science
In sport
Disqualification (boxing)
Disqualification (professional wrestling)
Disqualification (tennis)
Other uses
DQ code, used in telephone directory assistance in the UK