Janus Junius Toland, a sobriquet of pantheist philosopher John Toland

Janus, the criminal organization in the James Bond movie GoldenEye

Janus (mythology), the two-faced god of gates, doors, doorways, beginnings, and endings in Roman mythology

Windows 3.1 (codenamed Janus)

The Janus Project, a taboo cloning project in the movie Judge Dredd

Janus (moon), a moon of Saturn

Janus of Cyprus, king of Cyprus from 1398 to 1432

Janus (Angels and Demons), the antagonist in the novel Angels and Demons

The Janus Directive, a DC Comics crossover

Janus Capital Group, an investment company based in Denver, Colorado

Schempp-Hirth Janus, a two-seater glider

Janus Ulitius, the Latinized name of 17th century philologist Jan van Vliet

a Janus word, or auto-antonym: a word with two opposite meanings

Janus (band), an orchestral darkwave group

Janus (DRM), a Digital Rights Management platform of Microsoft

Janus Films, an American film distribution company

Janus Friis, the Danish entrepreneur best known for co-founding the file-sharing application KaZaA and Skype, the peer-to-peer telephony application

Janus (programming language)

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

Janus chess, a chess variant

Janus I, Duke of Masovia

Zündapp Janus, a bubble car model by Zündapp

HMS Janus, British naval ships

Society of Janus, a San Francisco based BDSM education and support group

Janus Island, in the Palmer Archipelago of Antarctica

Janus Records, a record label

Janus-faced molecule, A molecule that has an effect either positive or negative depending on the situation.

Janus was the pre-release codename for Windows 2000 64-bit editions for Alpha and Itanium

Janus: A Summing Up, a book by Arthur Koestler

Janus (comics), a superhero in the DC Comics universe

Janus, another comic book superhero, from the Marvel Comics universe and an enemy of Dracula

Janus (Stargate), an Ancient scientist in the TV series Stargate Atlantis and Stargate SG-1