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

Astronomy

• 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

Literature

• 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

Other uses

• 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

See also

• 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.
If an internal link led you here, you may wish to change the link to point directly to the intended article.