A Crystal could refer to:

  1. Ancient crystal power cell, power sources created by the Lanteans.
  2. Control crystal, crystals used in controlling the technology of a variety of cultures.
  3. Crystal of M3X-387, a crystalline race native to the Pegasus galaxy.
  4. Crystal skull, devices, built by the Omeyocan, with a function of transportation and dimension shifting.
  5. Crystal Skull, the twenty first episode of the third season of Stargate SG-1.
  6. Unity, a crystalline race native to the Milky Way galaxy.

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