QD may refer to:
- Air Class Líneas Aéreas IATA airline designator
- Queue Depth
- Quantic Dream
- Quantum dot
- quaque die, a Latin phrase meaning "every day"
- Quarter-deck, a part of a ship
- Queen Dowager
- Questioned Documents, the field of forensics that deals with the scientific examination of documents
- Quick Detachable OR Quick Disconnect
- Nokia N-Gage QD
- Quill and Dagger, a Senior Honor Society at Cornell University
- ATCvet code QD Dermatologicals, a section of the Anatomical Therapeutic Chemical Classification System for veterinary medicinal products