QD may refer to:
Businesses and organizations:
- QD stores, a chain of discount retail outlets in England
- Air Class Líneas Aéreas (IATA airline designator QD)
- Dobrolet (low-cost airline) (IATA airline designator QD)
- Quantic Dream, a French video game developer
- Quill and Dagger, a Senior Honor Society at Cornell University
Science and technology:
- Quantum dots, very small semiconductor particles, in nanotechnology
- Quarter-deck, a part of a ship
- Questioned Documents, the field of forensics that deals with the scientific examination of documents
- Nokia N-Gage QD, a handheld game console and smartphone by Nokia
- Quick disconnect, a mechanical fitting used to provide a fast, make-or-break connection of fluid transfer lines
- ATCvet code QD Dermatologicals, a section of the Anatomical Therapeutic Chemical Classification System for veterinary medicinal products
- Quaque die, a Latin phrase meaning "every day"
- Queen dowager, a title or status generally held by the widow of a king
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