- Janus (mythology) , the two-faced god of gates, doors, doorways, beginnings, and endings in Roman mythology
- Janus Of Cyprus , king of Cypress from 1398 to 1432
- 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.
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