QQ may refer to:

• Tencent QQ (qq.com), a Chinese instant messaging program
• Alliance Airlines, IATA airline designator
• Chery QQ, a compact Chinese car, which is considered an imitation of GM's Chevrolet Spark/Daewoo Matiz
• QinetiQ Ltd., a UK science and technology company
• Q-Q plot, a plot to compare distributions in statistics
• Reno Air, former IATA airline designator
• QQ, quit in Leetspeak. More broadly, quit complaining.
• QQ, an emoticon for a crying face.
• QQ, "QQ" A "quit" command in Multi-user Dungeons (MUDs, text-based MMOs ), changed from "q" which caused problems as it was too close to "w," the command for going west.
• Quisqualate receptors - non-NMDA-type ionotropic transmembrane receptor for glutamate that mediates fast synaptic transmission in the central nervous system (CNS).

qq may refer to:

• qq-operator in Perl programming language

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