Mars is the fourth planet from the Sun.

Mars also commonly refers to:

• Mars (mythology), the Ancient Roman god of war, equivalent to the Greek god Ares
• Mars Inc., a confectioner and food company
  • Mars bar, produced by Mars, Inc.

Mars may also refer to:

• MARS (gene), a human enzyme
• Medication Administration Record Sheet
• MARS, the Molecular Adsorbents Recirculation System for liver dialysis

• Mars Glacier, Alexander Island, Antarctica

• MaRS Discovery District, a scientific research centre in Toronto
• McGill Arctic Research Station, Nunavut, Canada

• Mars, Ardèche, France
• Mars-sous-Bourcq, Ardennes, France
• Mars, Gard, France
• Mars, Loire, France
• Mars-la-Tour, Meurthe-et-Moselle, France
• Mars-sur-Allier, Nièvre, France

• Monterey Accelerated Research System, a cabled-based ocean observatory in Monterey Bay, California
• Mars, California, a populated place
• Mars Bluff, South Carolina, an unincorporated community
• Outingdale, California, formerly called Mars, a populated place
• Le Mars, Iowa, a city in and the county seat of Plymouth County
• Mars Hill, Maine, a town
• Mars Hotel (Arches National Park), a summit in Utah
• Mars, Nebraska, a ghost town
• Mars, Pennsylvania, a borough
• Mars, Texas, a ghost town

• Mars, Chernihiv Oblast, a village in the North of Ukraine

• Mars (Black Clover), a character in Black Clover
• Mars (Biker Mice from Mars), the planet as it appears in Biker Mice from Mars
• Military Armament Research Syndicate, a fictional organization in the G.I. Joe universe
• Commander Mars, a Pokémon character
• Mars or Scarface, an Ultimate Muscle character
• The Megaversity Association for Reenactments and Simulations, a fictional association in The Big U
• Mars the Dog, canine star of A Dog's Breakfast

• Mars (1930 film), an animated short film in the Oswald the Lucky Rabbit series
• Mars (1968 film), a soviet science education/fiction film
• Mars (1997 film), a film starring Shari Belafonte
• Mars (1998 film), a film starring Olivier Gruner
• Mars (2004 film), a Russian film set in Mars, a small town on the Black Sea
• Mars (2010 film), a 2010 animated film
• Mars (American TV series), a 2016 docudrama science fiction series
• Mars (Taiwanese TV series), a 2004 drama series based on the manga by Fuyumi Soryo
• Mars (talk show), a Philippine female talk show on GMA News TV and GMA
• Mars, an upcoming animated film by The Whitest Kids U' Know
• Mars: Zero's Rebellion, a 2024 drama series starring Shunsuke Michieda

• Mars (Fritz Zorn), a 1976 autobiographical essay by Fritz Angst
• Mars (comics), a comic book series
• Mars (manga), a 1996 manga series by Fuyumi Soryo
• Mars trilogy, three science fiction novels by Kim Stanley Robinson
• Mars, a novel by Ben Bova in the Grand Tour series
• Mars, 1976 manga series by Mitsuteru Yokoyama
• The Mars Project, a non-fiction science book by Wernher von Braun
• Project Mars: A Technical Tale, a science fiction novel by Wernher von Braun

• Mars (B'z album)
• Mars (Gackt album)
• Mars, disk two of the Red Hot Chili Peppers double album Stadium Arcadium
• Mars, an album by Sinkane

• Mars Music, a now defunct U.S. music store chain
• Mars (band), a No Wave band
• M.A.R.S., a heavy metal supergroup that released the 1986 album Project Driver
• MARRS, British electronic music group

• "Mars" (song), a 2008 single by Fake Blood
• "Mars, the Bringer of War", a movement in Holst's The Planets
• "Mars", a song by Jay Sean from Neon
• "Mars", a song by Mario from Closer to Mars
• "Mars", a song by Soulfly from Prophecy

• Project Mars, codename for the Sega 32X add-on video game console
• Memory Array Redcode Simulator, the environment for the competitive programming game Core War

• MARS (missile), air to ground missile built by Israel Military Industries
• Mars Automatic Pistol, a semi-automatic pistol developed in 1900
• MARS tanker programme, which resulted in the four Tide-class tankers that entered service with the British Royal Fleet Auxiliary from 2017
• ITL MARS, a reflex sight made by International Technologies Lasers
• Operation Mars, codename of the Second Rzhev-Sychevka Offensive, a Soviet offensive during World War II
• Military Auxiliary Radio System, an auxiliary communications system of amateur radio operators for the United States armed forces
• Mittleres Artillerie Raketen System or M270 Multiple Launch Rocket System
• Operation Mars, 28 March 1918 German offensive in World War I, part of the Spring Offensive
• Machine-Assisted Analytic Rapid-Repository System, a US Defense Intelligence Agency data repository

• Dutch frigate Mars, later HMS Mars, a 32-gun fifth rate ship of the line built in 1769
• French ship Mars, a list of French warships
  • French privateer Mars (1746), later HMS Mars, a 64-gun third-rate
• German trawler V 621 Mars, a German vorpostenboot in service in 1944
• HMS Mars, a list of ships of the Royal Navy
  • HMS Mars (1759), a 74-gun third rate
  • HMS Mars (1794), a 74-gun third rate
    • Mars-class ship of the line
  • HMS Mars (1848), an 80-gun second rate
  • HMS Mars (1896), a Majestic-class battleship
  • HMS Mars (R76), a Colossus-class aircraft carrier renamed HMS Pioneer in 1944
  • Mars, a planned Minotaur-class cruiser of the Royal Navy, cancelled in 1946
• SMS Mars, a list of ships
  • SMS Mars (1879), a German gunnery training ship
  • SMS Tegetthoff (1878) or SMS Mars, an Austro-Hungarian central battery ship
• Swedish warship Mars, a ship sunk in 1564
• USS Mars, several ships of the US Navy
  • USS Mars (1798), a galley
  • USS Mars (AC-6), launched in 1909
  • USS Mars (AFS-1), launched in 1963
    • Mars-class combat stores ship
• Mars class, several ship classes

• Mars (beer), a type of lambic ale
• Mars (motorcycle), a defunct German motorcycle manufacturer
• Mars (oil platform), an oil drilling platform in the Gulf of Mexico
• Mars (supermarket), a U.S. grocery chain
• Icaro Mars, an Italian hang glider design
• MARS Group, a British architectural think tank founded in 1933
• Mauritius Amateur Radio Society
• Mongolian Amateur Radio Society
• Mumbai Amateur Radio Society, Mumbai, India
• Mars Tver, a former name of THK Tver, a minor professional ice hockey club in Tver, Russia

• Mars (surname), a list of people with the surname
• Cheung Wing-fat (born 1954), nicknamed Mars, Hong Kong actor, action director, stuntman and martial artist
• Mars (rapper) (born 1980), stage name of Mario Delgado, American horrorcore rapper
• Mars (record producer), moniker of Lamar Edwards from production teams 1500 or Nothin' and Smash Factory
• Jean-Baptiste Belley or Mars (1740s–1805), Senegalese Haitian politician
• Xueyang "Mars" Ma, member of Mandopop boy band Top Combine

• Mars Argo, stage name of Brittany Sheets, American singer, songwriter, actress, photographer, Internet personality and YouTuber
• Mars Bonfire (born 1943), Canadian musician and songwriter
• Mars Di Bartolomeo (born 1952), Luxembourgish politician
• Mars Ravelo (1916–1988), Filipino comic book cartoonist and graphic novelist

• MARS (cipher), a block cipher, IBM's submission for the AES
• Cisco Security Monitoring, Analysis, and Response System, a security monitoring tool for network devices
• Mars computer, a family of PDP-10-compatible digital computers built by Systems Concepts
• Mars program, a series of uncrewed spacecraft launched by the Soviet Union
• Mid-Atlantic Regional Spaceport, a space launch site on Wallops Island, Virginia
• Mars Analogue Research Station Program, of The Mars Society
• Marketing and Reporting Sales system, a customer relationship management software package produced and sold by Phoenix American

• Mars Light, an oscillating railroad safety light found on locomotives
• MARS (ticket reservation system), a train seat reservation system used in Japan
• Mars (Metra), a station on Metra's Milwaukee District/West in Chicago, Illinois
• JRM Mars, a flying boat
• Mars, a West Cornwall Railway locomotive

• Mars (astrology), a set of qualities and influences
• Mars (surname)
  • Mars family, the family that owns Mars, Incorporated
• Multivariate adaptive regression spline, a statistical analysis technique

• Ares (disambiguation)
• Colonization of Mars for the Mars colony concept
• Exploration of Mars, for various Mars projects and programmes
• Champ de Mars (disambiguation)
• Field of Mars (disambiguation)
• Mars 1 (disambiguation)
• Mars II (disambiguation)
• Mars Hill (disambiguation)
• Mars station (disambiguation)
• Marrs, an American surname
• All pages with titles beginning with Mars
• All pages with titles beginning with MARS
• All pages with titles containing mars