# Janus (disambiguation)

Janus is the two-faced Roman god of gates, doors, doorways, beginnings, and endings.
Janus may also refer to:

## Computing

* Janus (concurrent constraint programming language)
* Janus (DRM), a Microsoft Digital Rights Management platform
* Janus (protocol), a file transfer protocol for use on bulletin board systems
* Janus (time-reversible computing programming language)
* JANUS clinical trial data repository, a standard supported by the U.S. Food and Drug Administration
* Janus Recognition Toolkit (JRTk), a general purpose speech recognition toolkit
* Janus, a codename used for Windows 2000 (DEC Alpha and Itanium 64-bit editions)
* Janus attack, an alternative name of a Man-in-the-middle attack

## People

* Janus (given name)
* Janus (surname)
* Janus Prospero from the Resident Evil film series
* Janus of Cyprus (1375–1432), king of Cyprus from 1398 to 1432
* Janus I, Duke of Masovia
* J'anus, the claimed stage name of Janis McGavin, a performer on Balls of Steel Australia

## Astronomy

* Janus Patera [it], a shallow volcanic crater on Io, a moon of Jupiter
* Janus (moon), a moon of Saturn
* Janus (star), the name given to the hydrogen-helium faced white dwarf star ZTF J203349.8+322901.1

## Performing arts
### Music

* Janus Records, a record label
* Janvs, a black metal band from Liguria, Italy
* Janus (musical project), a German darkwave musical project established 1995
* Janus (American band), hard rock band, established in the mid-1990s in Chicago, Illinois
* Janus (album), the first full-length album released by Boyfriend

### Film

* Janus Films, an American film distribution company
* Janus, the criminal organization in the James Bond movie GoldenEye
* The Janus Project, a taboo cloning project in the movie Judge Dredd

### Other performing arts

* Janus (play), a 1955 Broadway romantic comedy
* Janus (TV series), an Australian drama television series

## Printed media
### Comics

* Janus (comics), a list of characters
* Janus (Marvel Comics), Marvel Comics character
* Janus, DC Comics character known as Two-Face
* Janus, character in the novel Angels & Demons

### Other printed media

* Janus (journal) (1896–1990), an academic journal on history of science and medicine published in Amsterdam
* Janus (science fiction magazine), a feminist science fiction magazine published from 1975-1980
* Janus: A Summing Up, a 1978 book by Arthur Koestler
* The Janus branch of the Cahill family in The 39 Clues
* Janus word or auto-antonym, a word with multiple meanings in which one is the reverse of another
* Janus, a French poetry magazine published in Paris by Elliott Stein from 1950 to 1961
* Janus (1971-2007), a British fetish magazine of erotic spanking and caning imagery.

## Games and gaming

* Janus Chess, a chess variant
* Janus Zeal, a character in the game Chrono Trigger

## Places

* Janus Island, an island of the Palmer Archipelago, Antarctica
* Mont Janus, a mountain near Mont Chaberton, France

## Science

* Janus (genus), a genus of stem sawflies in the family Cephidae
* 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
* Janus kinase, an intracellular signalling molecule; component of the JAK-STAT signal system
** Janus kinase inhibitor, a medication that inhibits the activity of the Janus kinase enzymes
* Janus particle, an amphiphilic particle with a surface that is half hydrophilic half hydrophobic
* Janus TMD monolayers, a type of asymmetric transition-metal dichalcogenide monolayers
* Janus (spacecraft), a NASA mission to binary asteroids

## Transportation and vehicular

* Janus (1810 ship) (1810–1832), built in New York, U.S.
* HMS Janus, a name used by British naval ships
* Schempp-Hirth Janus, a German two-seater glider
* Yorkshire Engine Company Janus, a British diesel shunting locomotive
* Zündapp Janus, a bubble car model by Zündapp
* Janus Motorcycles, a motorcycle manufacturer based in Goshen, Indiana

## Other uses

* Janus Capital Group, an investment company based in Denver, Colorado
* Janus v. AFSCME, U.S. Supreme Court case (2018)
* Society of Janus, a San Francisco-based BDSM education and support group
* Janus, catalogue database of Cambridge University Library