Crystal may refer to:
- Crystal Nerdlinger: A girl Shaggy once knew, who was mentioned in the SDWAY episode, What the Hex Going On?.
- Crystal Fine: The owner of Hot Springs Health Spa, from DC Comics' Scooby-Doo! story, Hot Springs, Cold Sweat.
- Crystal: A real alien who posed as a human hippy on Earth, and became a love interest for Shaggy, from the direct-to-video film, Scooby-Doo and the Alien Invaders.
- Crystal: A magician's assistant who worked at the Merlin Brothers Academy of Magic, from the direct-to-video film, Scooby-Doo! Abracadabra-Doo.
- Crystal Scales: The voice actress of Crystal from Scooby-Doo! Abracadabra-Doo.
- Crystal: The real identity of the ghost miner, from DC Comics' Scooby-Doo! Where Are You? story, Scare Mail.