Johann Joachim Quantz (1697–1773) was a German flutist and composer.

Quantz may also refer to:

• QuantZ, a 2009 puzzle video game
• Quantz Verzeichnis, a catalogue of compositions by Johann Joachim Quantz, created by Horst Augsbach
• Qwantz.com, the host of Dinosaur Comics
• 9911 Quantz, a minor planet

• Quantztown, Ontario