Phaser may refer to:
- Barber pole phaser is an analog synthesizer specially designed to create Shepard tones, an Auditory illusion.
- Endosulfan, an organic compound
- Phaser (fictional weapon), in the Star Trek fictional universe
- Phaser (effect), in electronics, an audio signal processor used to distort the signal
- Light Phaser, a lightgun for the Sega Master System video game system
- Xerox Phaser, Xerox's trade name for makes of thermal transfer printers, solid ink printers and color laser printers
- The Personnel Halting and Stimulation Response rifle (PHASR), a dazzler weapon
- Phaser, an insecticide containing the active ingredient endosulfan
- Phaser Digital Power Transducer from Second Wind
- Phaser (band), a Washington, D.C. rock band
See also:
- Phase (disambiguation)
- Phasor (disambiguation)
- FASOR