Hydra may refer to:
Society
Technology
- Hydra (chess), a chess computer
- Hydra class frigate, the name of a frigate class of the Hellenic Navy
- Greek battleship Hydra, a Hellenic Navy pre-dreadnought battleship
- Hydra (operating system)
- Hydra (software), a software used to test weak computer network passwords
- HYDRA Game Development Kit, a retro games development system, by André LaMothe
- HMS Hydra, the name of several Royal Navy vessels
- Hydra (ship), a hydrogen ship
- Hydra 70, an air-to-ground rocket
- Hydra 100, a multi-gpu hardware solution
- Hydra Project (EU Project), EU funded research project
- Hydra Technologies of Mexico, a firm dedicated to the design and development of unmanned aerial vehicles
Music
- Hydra Entertainment, hip hop record label
- Hydra Head Records, an independent record label
- Hydra (Iris Album) , an album by Synthpop band, Iris
- Hydra (album), an album by Toto
- "Hydra", a song on the above album
- Hydra (band), a Southern rock band
- Hydra (Satariel album), an album by Satariel
- Hydra, a song by popular Japanese rock band, Dir en grey from their album Macabre
Fiction
- HYDRA, a secret criminal organization in the Marvel Universe
- Hydra (Transformers), one of several Transformers characters
- The Hydra, a Cthulhu Mythos deity created by Henry Kuttner
- Mother Hydra, co-ruler of the Deep One race and consort of Father Dagon in the fictional Cthulhu mythos
- The Hydra flak tank in the Warhammer 40,000 universe
- Hydra, a DHARMA Initiative station on the TV series Lost
See also
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