Hydra generally refers to: *

Lernaean Hydra The Lernaean Hydra or Hydra of Lerna (), more often known simply as the Hydra, is a serpentine lake monster in Greek mythology and Roman mythology. Its lair was the lake of Lerna in the Argolid, which was also the site of the myth of the Dan ...

, a many-headed serpent in Greek mythology * ''Hydra'' (genus), a genus of simple freshwater animals belonging to the phylum Cnidaria Hydra or The Hydra may also refer to:

Astronomy

Hydra (constellation) Hydra is the largest of the 88 modern constellations, measuring 1303 square degrees, and also the longest at over 100 degrees. Its southern end borders Libra (constellation), Libra and Centaurus (constellation), Centaurus and its northern end bo ...

Hydra (moon) Hydra, formal designation (134340) Pluto III, is a natural satellite of Pluto, with a diameter of approximately across its longest dimension. It is the second-largest moon of Pluto, being slightly larger than Nix. Hydra was discovered along ...

, a satellite of Pluto

Computing

Hydra (chess) Hydra was a chess machine, designed by a team with Dr. Christian "Chrilly" Donninger, Dr. Ulf Lorenz, GM Christopher Lutz and Muhammad Nasir Ali. Since 2006 the development team consisted only of Donninger and Lutz. Hydra was under the patrona ...

, a chess computer *

Hydra (digital repository) Samvera, originally known as Hydra, is an open-source digital repository software product. Samvera main components are Fedora Commons, Solr, Blacklight, and HydraHead (a Ruby on Rails plugin and gem, respectively). Each Samvera implementation is ...

, an open-source digital repository software product later renamed Samvera *

Hydra (operating system) Hydra (stylized as HYDRA) is an early, discontinued, capability-based, object-oriented microkernel designed to support a wide range of possible operating systems to run on it.Wulf 74 pp. 337–345 Hydra was created as part of the C.mmp project at ...

, an early, discontinued, capability-based, object-oriented microkernel * Hydra (software), a parallelized network login cracker built in various operating systems * Hydra (specification), a specification for REST APIs * Hydra 100, a multi-GPU hardware solution * HYDRA Game Development Kit, a development system by André LaMothe *

Razer Hydra The Razer Hydra (previously known as Sixense TrueMotion) is a motion and orientation detection game controller developed by Sixense Entertainment, a company founded in 2007, in partnership with Razer USA. It uses a weak magnetic field to detect t ...

, a game controller * NEC HYDRAstor, a storage system

Fictional entities

Hydra (comics) Hydra (often capitalized as HYDRA) is a fictional list of designated terrorist organizations, terrorist organization appearing in American comic books published by Marvel Comics. Its name alludes to the mythical Lernaean Hydra, as does its mott ...

, a fictional organization in the Marvel Universe **

Hydra (Marvel Cinematic Universe) The Marvel Cinematic Universe (MCU) is an American media franchise and shared universe centered on superhero films and Superhero fiction, other series starring Superhero, various titular superheroes independently produced by Marvel Studios and b ...

, an organisation in the Marvel Cinematic Universe based on the comics counterpart * Hydra (''Dungeons & Dragons''), a fictional monster in ''D&D'' * Hydra (''Transformers''), a character in ''Transformers'' * The Hydra, a fictional organization in ''

The Phantom ''The Phantom'' is an American adventure comic strip, first published by Lee Falk in February 1936. The main character, the Phantom, is a fictional costumed crime-fighter who operates from the fictional African country of Bangalla. The char ...

'' * Hydra, a character in ''

UFO Ultramaiden Valkyrie is a Japanese manga series created by Kaishaku. The series was adapted into a 32-episode anime series and one specially released OVA episode by TNK. Seasons 1 and 2 were broadcast in Japan on Kids Station between 2002 and 2004. The anime ...

'' * The Hydra, a fictional deity created by Henry Kuttner ** Mother Hydra, the co-ruler of the

Deep One The Deep Ones are creatures in the Cthulhu Mythos of H. P. Lovecraft. The beings first appeared in Lovecraft's novella ''The Shadow over Innsmouth'' (1931), but were already hinted at in the early short story "Dagon". The Deep Ones are a race o ...

race in the Cthulhu Mythos * The Hydra, a fictional fighter jet in '' Grand Theft Auto: San Andreas'' and ''Grand Theft Auto Online'' * The Hydra, a fictional machine in ''

Kirby Air Ride ''Kirby Air Ride'' is a 2003 Racing game, racing video game developed by HAL Laboratory and published by Nintendo for the GameCube. A spin-off of the Kirby (series), ''Kirby'' series, the player controls Kirby (character), Kirby or his multicolo ...

'' * Hydra, a boss enemy in the video game ''

Prototype 2 ''Prototype 2'' (stylized as '' ROTOTYPE2') is a 2012 action-adventure video game developed by Radical Entertainment and published by Activision, and the sequel to 2009's ''Prototype.'' First announced at the 2010 Spike VGA Awards, it was release ...

Film and television

* '' Hydra'' (film), a 2009 monster movie * Hydra (''Chuck''), a fictional database on ''Chuck'' * Hydra, a fictional

Dharma Initiative The Dharma Initiative, also written DHARMA (Department of Heuristics and Research on Material Applications), is a fictional research project and organization featured in the television series ''Lost (2004 TV series), Lost''. It was introduced in ...

station on ''Lost''

Music

Hydra Entertainment Hydra Entertainment is a hip hop record label specializing in Instrumental hip hop. They are most notable for their ''Hydra Beats'' series of instrumental albums by prominent hip hop producers. All of its releases are out of print. Hip hop grou ...

, the hip-hop record label *

Hydra (band) Hydra is an American Southern rock band founded in 1970 by Spencer Kirkpatrick (guitar), Wayne Bruce (vocals and guitar), Steve Pace (drums) and Orville Davis (bass). In 1977, it became a three-piece band (with Wayne Bruce now on bass) and the ...

, an American southern rock band in the 1970s *

Hydra (E.P.) Hydra generally refers to: * Lernaean Hydra, a many-headed serpent in Greek mythology * ''Hydra'' (genus), a genus of simple freshwater animals belonging to the phylum Cnidaria Hydra or The Hydra may also refer to: Astronomy * Hydra (constel ...

, an E.P. by British ambient duo

Main (band) Main were a British band formed in 1991 by guitarists Robert Hampson and Scott Dowson, both formerly of the English rock band Loop. Drawing on that group's experimentation with drones and guitar texture, the duo moved further into ambient s ...

, 1991 * ''Hydra'' (Otep album), 2013 * Hydra, an album by Satariel, 2005 * ''Hydra'' (Toto album), or the title song, 1979 * ''Hydra'' (Within Temptation album), 2014 * ''Hydra'', an album by

Iris Iris most often refers to: *Iris (anatomy), part of the eye * Iris (color), an ambiguous color term *Iris (mythology), a Greek goddess * ''Iris'' (plant), a genus of flowering plants * Iris (given name), a feminine given name, and a list of peopl ...

, 2008 * "Hydra", a song by Dir En Grey from ''

Macabre In works of art, the adjective macabre ( or ; ) means "having the quality of having a grim or ghastly atmosphere". The macabre works to emphasize the details and symbols of death. The term also refers to works particularly gruesome in natu ...

'', 2000 * "Hydra", a song by Twilight Force from ''

Dawn of the Dragonstar ''Dawn of the Dragonstar'' is the third studio album by Swedish symphonic power metal band Twilight Force. It was released on 16 August 2019. It is the band's second album with Nuclear Blast Records, the first to feature vocalist Allyon, and the ...

'', 2019 * "HYDRA", a song by Myth & Roid, 2018 * "The Hydra", a song by Le Sserafim from '' Antifragile'', 2022

People

Hydra (skater) Jennifer Wilson, known as Hydra, is a roller derby skater who has played a leading role in the development of the sport. Hydra joined Bad Girl Good Woman (BGGW) in 2001, around the time that the league was founded.Hydra (wrestler), American professional wrestler * Hydra, an alias of DJ and producer

The Thrillseekers Steve Helstrip, known by the stage name the Thrillseekers, is an English DJ and record producer. His debut single was "Synaesthesia", released in 1999. Helstrip has worked under the guises of En Motion, Insigma, Rapid Eye and Hydra. He also w ...

Places

* Hydra, Algeria, a neighbourhood and a municipality in Algiers *

Hydra (island) Hydra, or Ydra or Idra (; , ), and in Ancient history, antiquity Hydrea, is one of the Saronic Islands of Greece, located in the Aegean Sea between the Myrtoan Sea and the Argolic Gulf. It is separated from the Peloponnese by a narrow strip of ...

, an island of Greece

Ships

* ''Hydra'' (ship), a hydrogen ship * Greek ironclad ''Hydra'', a French-built ironclad warship launched in 1889 * Greek destroyer ''Hydra'', a ''Dardo''-class destroyer launched in 1932 * Greek frigate ''Hydra'', a ''MEKO 200''-type frigate launched in 1992, lead ship of the ''Hydra'' class frigate * HMS ''Hydra'' (1797), a 38-gun fifth rate * HMS ''Hydra'' (1838), a wooden steam paddle sloop ** ''Hydra''-class sloop, a class of British steam sloops * HMS ''Hydra'' (1871), a Cyclops-class turret ship * HMS ''Hydra'' (1912), an Acheron-class destroyer * HMS ''Hydra'' J275), an Algerine-class minesweeper launched in 1942 * HMS ''Hydra'' (A144), an oceanographic survey vessel launched in 1965 * Hydra-class minelayer, a class of Dutch 1910s minelayers * , a Dutch Navy diving support vessel

Other uses

* '' The Hydra'', a literary magazine *

Hydra (association) Hydra e. V. is a German self-help and advocacy group for prostitutes. The self- proclaimed "Hurenorganisation" (Whore organisation) is a non-profit association that was founded in 1980 by interested women as the first West German organisation of ...

, a German self-help and advocacy group for prostitutes * ''Hydra'' (video game), an arcade and Atari Lynx video game *

Hydra game Hydra generally refers to: * Lernaean Hydra, a many-headed serpent in Greek mythology * ''Hydra'' (genus), a genus of simple freshwater animals belonging to the phylum Cnidaria Hydra or The Hydra may also refer to: Astronomy * Hydra (constel ...

, a concept in mathematical logic *

Hydra Market Hydra (Russian: Гидра) was a Russian language dark web marketplace, founded in 2015, that facilitated trafficking of illegal drugs, financial services including cryptocurrency tumbling for money laundering Money laundering is the proc ...

, a Russian language dark web marketplace that facilitated trafficking of illegal drugs as well as financial services *

Hydra the Revenge Hydra the Revenge, or simply Hydra, is a steel Floorless Coaster at Dorney Park & Wildwater Kingdom in Dorneyville, Pennsylvania. Manufactured by Bolliger & Mabillard, the coaster opened to the public on May 7, 2005. Hydra was built on the site ...

, a roller coaster at Dorney Park in Pennsylvania, US *

Hydra 70 The Hydra 70 rocket (weapon), rocket is an American made diameter fin-stabilized unguided rocket used primarily in the air-to-ground role. It can be equipped with a variety of warheads, and in more recent versions, guidance systems for point att ...

, an air-to-ground rocket * Hydra Technologies, an unmanned aerial vehicle firm *

Hydra Trophy The Hydra Trophy is the trophy awarded to the Women's Flat Track Derby Association (WFTDA) team that wins the WFTDA Championship Tournament at the conclusion of every WFTDA roller derby season. Named in honor of Hydra (skater), Hydra, founding mem ...

, a trophy of the roller derby WFTDA Championships * Hydra, a wireless station during World War II at

Camp X Camp X was the unofficial name of the secret Special Training School No. 103, a Second World War British paramilitary installation for training covert agents in the methods required for success in clandestine operations. It was located on the n ...

Operation Hydra (Yugoslavia) Operation Hydra was a failed British attempt during World War II in Yugoslavia to develop contact with the Partisans led by Josip Broz Tito, in Montenegro in February 1942. Two British Special Operations Executive agents and an officer of the Ro ...

Operation Hydra (1943) Operation Hydra was an attack by RAF Bomber Command on a German scientific research centre at Peenemünde on the night of 17/18 August 1943. Group Captain John Searby, commanding officer of No. 83 Squadron RAF, commanded the operation, the fir ...