Mars can refer to different things:

• Mars is the fourth planet from the Sun.
• Mars was the god of war in Roman mythology.
• Mars, Incorporated is a confectioner, and the Mars Bar is the name of a candy bar they produce.
• "Mars, the Bringer of War" is a movement in Gustav Holst's The Planets suite.
• Mars was a short-lived No Wave band.
• Mars is the title of a manga comic book.
• Mars is an actor from Hong Kong, member of the Jackie Chan stuntman team.
• Technology
  • Seven ships of the Royal Navy have been named HMS Mars.
  • The Mars probe program was a series of unmanned craft launched by the Soviet Union in the early 1970s.
  • Mars was the code name for a family of PDP-10-compatible computers built by Systems Concepts.
  • In cryptography, MARS is a block cipher designed by IBM, and one of the finalists for the Advanced Encryption Standard.
  • MARS can stand for Military Affiliate Radio System , an auxiliary communications system for the United States armed forces
• Places
  • Mars is a borough located in Butler County, Pennsylvania
  • Mars Hill is a town in Aroostook County, Maine
  • Mars' Hill is an obsolete translation, used for instance in the Authorised Version of the Acts of the Apostles, for the Areopagus (Hill of Ares) in Athens.
  • Mars is a commune in the Ardèche département, in France.
  • Mars is a commune in the Gard département, in France.