A detector is a device capable of registering a specific substance or physical phenomenon.
Detector may also refer to:
- Detector (radio), a device that recovers information from a modulated wave
- Detector (film), a 2000 Norwegian film
- USS Detector, two United States Navy ships
- , was a coastal minesweeper launched 29 May 1941
- , was a minesweeper launched 5 December 1952