Phaser can refer to:
- Phaser (fictional weapon), in the Star Trek fictional universe, a beam weapon commonly used by the protagonists
- Phaser (effect), in electronics, an audio signal processor used to distort the signal
- Light Phaser, a lightgun for the Sega Master 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, in the Novell networking environment, a part of an old command that executes through a login script which plays a sound file called phasers.wav, with the following syntax: "fire phasers <number of times>."
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