This is a disambiguation page.
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Planet X may refer to:
In-universe
- Planet X (Famine on Planet X) - the planet featured in the Doctor Who Annual short story, Famine on Planet X.
- Planet X (Risk Assessment) - a planet mentioned in the Torchwood novel, Risk Assessment.
- Planet X (Planet X) - the planet featured in the Bernice Summerfield audio story, Planet X.
Real world
- Planet X (audio story) - the second story in The New Adventures of Bernice Summerfield Volume 3: The Unbound Universe.
- Famine on Planet X (short story) - a short story in Doctor Who Annual 1979.