Janus may refer to:

• Janus (mythology), the two-faced god of gates, doors, doorways, beginnings, and endings in Roman mythology
• Janus of Cyprus, king of Cyprus from 1398 to 1432
• 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
• Schempp-Hirth Janus, a two-seater glider
• Janus, the criminal organization headed up by Alec Trevelyan in the James Bond movie GoldenEye
• Janus Films, an American film distribution company
• Janus Records, a record label
• Janus Capital Group, an investment company based in Denver, Colorado
• Janus chess, a chess variant
• Janus (comics), a comic book superhero in the DC Comics universe
• The Janus Directive, a DC Comics crossover
• Janus, another comic book superhero, from the Marvel Comics universe and an enemy of Dracula
• Janus (DRM), a Digital Rights Management platform of Microsoft
• Janus Island, in the Palmer Archipelago of Antarctica
• Janus Lake (Ontario), in Ontario, Canada
• Janus Lake (Washington), in Snohomish County, Washington
• Mont Janus, in France
• Mount Janus (Antarctica), in Antarctica
• Mount Janus (Newfoundland), in Newfoundland and Labrador, Canada
• Mount Janus (Svalbard), in Svalbard, Norway.
• Janus (moon), a moon of Saturn
• Janus Patera, a shallow volcanic crater on Io, a moon of Jupiter
• Janus Peak, in British Columbia, Canada
• Janus (simulation), a military combat simulation first developed in the late 1970s by the Lawrence Livermore National Laboratory's Combat Simulation Laboratory
• the Society of Janus, a San Francisco based BDSM education and support group
• Janus Zeal, a character in the game Chrono Trigger
• Zündapp Janus, a bubble car model by Zündapp
• a Janus word, or auto-antonym: a word with two opposite meanings
• Janus (band), a musical group rooted in Louisville Kentucky created in the summer of 2005 Janus
• Janus computer programming language
• Janus (TV), A television series created by the Australian Broadcasting Commission with two story lines: the criminal family being prosecuted and the police/judicial process
• Janus, a French poetry magazine published in Paris by Elliott Stein from 1950 to 1961.
• Janus, a German orchestral darkwave group
• Janus, a Microsoft codename for a beta version of Windows 3x
• Janus (Angels and Demons), Janus the antagonist in the 2000 novel Angels and Demons.
• Janus (Paul Kelly), an English professional wrestler.

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