Moonstone may refer to:
In geography:
- Moonstone, California, an unincorporated community in Humboldt County, California
- Moonstone, Ontario, a township in Ontario, Canada
- Mount St. Louis Moonstone, a southern Ontario ski resort
In literature:
- Moonstone (comics), a character in the Marvel Universe
- Moonstone (imprint), an imprint of HarperCollins
- Moonstone Books, an American publisher
- The Moonstone, a 1868 book by Wilkie Collins
- Moonstone, an artifact in the Lone Wolf gamebook series
- The Moonstone, a setting in Erin Hunter's Warriors novel series
In entertainment:
- Moonstone (company), a Japanese visual novel studio
- Moonstone (computer game), a 1992 computer game
- "Moonstone" (The Outer Limits), an episode of The Outer Limits
- The Moonstone (1909 film), an American film by William Nicholas Selig
- The Moonstone (1915 film), an American film by Frank Hall Crane
- The Moonstone (1934 film), an American film by Reginald Barker
- The Moonstone (1959 TV serial), a British miniseries made by the BBC
- "Moonstone", a 1967 song by Cat Stevens from New Masters
- Moonstones, a plot element in Skies of Arcadia
In other uses:
- Moonstone (gemstone), a sodium potassium aluminium silicate
- Lunar Society Moonstones, a set of eight carved sandstone memorials to various members of the Lunar Society
- Sandakada pahana or Moonstone, a unique feature of the Sinhalese architecture of ancient Sri Lanka
- Moonstone, a machine used to select numbers in the Lotto draw in the National Lottery (United Kingdom)
- Moonstone, a Performing Arts Festival performance given at IIT-Bombay