Planet X (disambiguation)

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 (Unbound Universe) - the planet featured in the Bernice Summerfield audio story, Planet X.
* Planetoid X - the planet featured in the Doctor Who audio story, Last of the Cybermen.
* Planet XXX - the planet mentioned in the Torchwood audio story, Through the Ruins.
== 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.