QD

QD may refer to:

* Air Class Lineas Aereas IATA airline designator
* Quantic Dream
* Quantum dot
* "quaque die", a Latin phrase meaning "every day"
* Quarter-deck, a part of a ship; See Deck (ship)
* Queen Dowager
* Questioned Documents, the field of forensics that deals with the scientific examination of documents
* Quick Detachable OR Quick Disconnect : in relation with Nokia N-Gage QD
* Quill and Dagger, Senior Honor Society at Cornell University