Janus may refer to:

• Janus (mythology), the two-faced Roman god of gates, doors, doorways, beginnings, and endings.
• Janus (moon), a moon of Saturn.
• Janus Patera, a shallow volcanic crater on Io, a moon of Jupiter.
• Janus (simulation), a military combat simulation first developed in the late 1970s by the Lawrence Livermore National Laboratory's Combat Simulation Laboratory.
• Society of Janus, a San Francisco based BDSM education and support group.
• Janus Capital Group, an investment company based in Denver, Colorado.
• Zündapp Janus, a bubble car model by Zündapp.
• a Janus word, or auto-antonym: a word with two opposite meanings.
• Janus (TV series), A television series created by the Australian Broadcasting Commission with two story lines: the criminal family being prosecuted and the police/judicial process.
• Schempp-Hirth Janus, a two-seater glider.
• HMS Janus, a name used by British naval ships.

People

• Janus of Cyprus, king of Cyprus from 1398 to 1432.
• Janusz I, Archbishop of Gniezno
• Janus I, Duke of Masovia
• Janus II, Duke of Masovia
• Janus Junius Toland, a sobriquet of pantheist philosopher John Toland.
• Janus Ulitius, the Latinized name of 17th century philologist Jan van Vliet.
• Janus Friis, the Danish entrepreneur best known for co-founding the file-sharing application KaZaA and Skype, the peer-to-peer telephony application.
• Janus (Paul Kelly), an English professional wrestler.

Computing

• Janus (programming language)
• "Janus" was a codename used for Microsoft Windows 3.1 and Windows 2000 (DEC Alpha and Itanium 64-bit editions).
• Janus (DRM), a Microsoft Digital Rights Management platform.
• JANUS clinical trial data repository, a standard supported by the FDA as a data warehouse for human clinical trial information

Film and music

• Janus Films, an American film distribution company.
• Janus Records, a record label.
• Janus (band), an orchestral darkwave group.
• Janus, the criminal organization in the James Bond movie GoldenEye.
• The Janus Project, a taboo cloning project in the movie Judge Dredd.
• "Janus", a song from the album Out and About with the Gone Jackals by hard rock group The Gone Jackals.
• "Janus" appears on the CD Inner Journeys: Myth + Legends by Cusco

Literature and comics

• Janus: A Summing Up, a book by Arthur Koestler.
• Janus (comics), a superhero in the DC Comics universe.
• Janus (Marvel Comics), a superhero in the Marvel Comics universe and an enemy of Marvel Comics' Dracula.
• The Janus Directive, a DC Comics crossover.
• Janus (Stargate), an "Ancient" scientist in the TV series Stargate Atlantis and Stargate SG-1.
• Janus (Angels and Demons), the antagonist in the novel Angels and Demons.
• Janus, a French poetry magazine published in Paris by Elliott Stein from 1950 to 1961.
• Janus Publishing, a British publishing company known for publishing the work of previously unpublished authors.
• Janus, a short story by Ann Beattie.

Magazines

• Janus (science fiction magazine), a feminist science fiction magazine.
• Janus (spanking magazine), a British spanking magazine edited by Harrison Marks.

Games and gaming

• Janus chess, a chess variant.
• Janus Zeal, a character in the game Chrono Trigger.
• In the RPG In Nomine, Janus is the Archangel of the Wind.

Geography

• Janus Island, an island of the Palmer Archipelago, Antarctica.
• Janus Lake (Ontario), Canada.
• Janus Lake (Washington), Snohomish County, Washington.
• Mont Janus, France.
• Mount Janus (Antarctica)
• Mount Janus (Newfoundland), Newfoundland and Labrador, Canada.
• Mount Janus (Svalbard), Norway.
• Janus Peak, British Columbia, Canada.

Science

• Janus-faced molecule, used to describe a molecule whose effects on organisms can vary between beneficial and toxic.
• Janus Experiments, a series of experiments on radio-sensitivity in mice and dogs.

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