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QD may refer to:

Businesses and organizations:

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

Other uses:

  • Quaque die, a Latin phrase meaning "every day"
  • Queen dowager, a title or status generally held by the widow of a king