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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 (constellation)
• Hydra (moon), a satellite of Pluto

Computing

• Hydra (chess), a chess computer
• Hydra (digital repository), an open-source digital repository software product later renamed Samvera
• Hydra (operating system), 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, a game controller
• NEC HYDRAstor, a storage system

Fictional entities

• Hydra (comics), a fictional organization in the Marvel Universe
  • Hydra (Marvel Cinematic Universe), 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
• Hydra, a character in UFO Ultramaiden Valkyrie
• The Hydra, a fictional deity created by Henry Kuttner
  • Mother Hydra, the co-ruler of the Deep One 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
• Hydra, a boss enemy in the video game Prototype 2

Film and television

• Hydra (film), a 2009 monster movie
• Hydra (Chuck), a fictional database on Chuck
• Hydra, a fictional Dharma Initiative station on Lost

Music

• Hydra Entertainment, the hip-hop record label
• Hydra (band), an American southern rock band in the 1970s
• Hydra (E.P.), an E.P. by British ambient duo Main (band), 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, 2008
• "Hydra", a song by Dir En Grey from Macabre, 2000
• "Hydra", a song by Twilight Force from Dawn of the Dragonstar, 2019
• "HYDRA", a song by Myth & Roid, 2018
• "The Hydra", a song by Le Sserafim from Antifragile, 2022

People

• Hydra (skater), roller derby skater
• Hydra (wrestler), American professional wrestler
• Hydra, an alias of DJ and producer The Thrillseekers

Places

• Hydra, Algeria, a neighbourhood and a municipality in Algiers
• Hydra (island), 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
• HNLMS Hydra (A854), a Duch Navy diving support vessel

Other uses

• The Hydra, a literary magazine
• Hydra (association), a German self-help and advocacy group for prostitutes
• Hydra (video game), an arcade and Atari Lynx video game
• Hydra game, a concept in mathematical logic
• Hydra Market, a Russian language dark web marketplace that facilitated trafficking of illegal drugs as well as financial services
• Hydra the Revenge, a roller coaster at Dorney Park in Pennsylvania, US
• Hydra 70, an air-to-ground rocket
• Hydra Technologies, an unmanned aerial vehicle firm
• Hydra Trophy, a trophy of the roller derby WFTDA Championships
• Hydra, a wireless station during World War II at Camp X
• Operation Hydra (Yugoslavia)
• Operation Hydra (1943)

See also

• Greek ship Hydra, a list of Hellenic Navy vessels
• HMS Hydra, a list of British Navy vessels
• Hydro (disambiguation)
• Hydrus, a small constellation in the deep southern sky
• Ghidra, reverse engineering software
• All pages with titles beginning with Hydra
• All pages with titles containing Hydra

• Disambiguation pages
• Place name disambiguation pages