A collet is a holding device, a subtype of chuck.
Collet may also refer to:
- Collet (name)
- Collet baronets, St Clere in the parish of Ightham in the County of Kent, was a title in the Baronetage of the United Kingdom
- Collet v. Collet, a Supreme Court of the United States decision
- The root–hypocotyl transition zone of a plant
- The Dream Collet, a magical book in the Yes! PreCure 5 anime