Jupiter is the fifth planet from the Sun.

Jupiter may also refer to:

• Jupiter (mythology), supreme Roman deity
• Jupiter (locomotive), another name for the Central Pacific No. 60 locomotive, best known for its role in the "Golden Spike" Ceremony
• Jupiter, Florida, a town in Palm Beach County, Florida
• Jupiter, Romania, a summer resort on the Black Sea
• Jupiter JVM, a Java virtual machine
• HMS Jupiter, three ships of the British Royal Navy
• Jupiter Novels, a series of science fiction novels published by Tor Books
• Jupiter, a novel by Ben Bova

In business:

• Jupitermedia Corporation, a U.S. company that manages Internet properties
• Jupiter (company), a Japanese game and hardware development studio
• Jupiter Limited, an Australian gambling company that merged with Tabcorp in 2003

In rocketry:

• PGM-19 Jupiter
• Jupiter-C (rocket)

In music:

• A line of music synthesizers made by Roland
  • Roland Jupiter-4
  • Roland Jupiter-6
  • Roland Jupiter-8
• Jupiters, a pop rock band from Pakistan
• Jupiter Band Instruments, a brand of woodwind, brass, and percussion instruments
• Jupiter, an album by rock band Cave In

Jupiter may also be:

• A name given to Mozart's Symphony No. 41
• A variety of apple developed in Kent, England
• The main villain in Robin Jarvis's The Deptford Mice trilogy
• "Jupiter, the Bringer of Jollity", a movement in Gustav Holst's suite The Planets, which contains the hymn "I Vow to Thee, My Country"
• "Song of Jupiter", an arrangement by Leroy Anderson of the aria "Where'er you walk" from Handel's oratorio Semele
• Sailor Jupiter, the codename of Makoto Kino, a character in the Sailor Moon franchise
• The name of Fireman Sam's Fire Engine

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