Tenth planet is a term formerly applied to possible planets beyond Neptune, before the reclassification of Pluto. It may also refer to:

• 2060 Chiron, claimed by some to be the tenth planet upon discovery
• 15760 Albion, then nicknamed "Smiley" and hailed as the tenth planet
• Eris (dwarf planet), referred to by some to be the tenth planet after discovery, up to the reclassification of Pluto

• Doctor Who and the Tenth Planet, a 1976 Doctor Who novelization by Gerry Davis
• The Tenth Planet, a. k. a. Days of Creation, a 1944 Captain Future novel by Joseph Samachson under the house name Brett Sterling
• The Tenth Planet, a 1973 novel by Edmund Cooper
• The Tenth Planet, a 1984 novel by Leo Melamed
• The Tenth Planet, a 1999 novel by Dean Wesley Smith and Kristine Kathryn Rusch, the first installment in a trilogy of novels

• The 10th Planet, a cancelled space combat game
• 10th Planet Jiu-Jitsu, non-traditional system of Brazilian Jiu-Jitsu
• The Tenth Planet, a 1952 Hollywood Star Playhouse radio play starring Joseph Cotten
• The Tenth Planet, a 1965 Doctor Who serial
• "The Tenth Planet?", a 1972 episode of the BBC astronomy programme The Sky at Night
• "Tenth Planet", a song by Solid Space from the 1982 album Space Museum

• Planet X (disambiguation)
• Ninth planet (disambiguation)
• Eleventh planet
• Fictional planets of the Solar System

This disambiguation page lists articles associated with the title Tenth planet.
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