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