Hydra may refer to:
- The recurring enemy.
- The character from Final Fantasy V.
- The weapon from Dirge of Cerberus -Final Fantasy VII-.
- The field boss from Final Fantasy Crystal Chronicles: The Crystal Bearers.
Hydra was one of the spawn of Echidna, a many-headed serpentine monstrosity in Ancient Greek mythology. It could breathe poison, and indeed its very blood was deadly. The Hydra was killed as one of Heracles's Twelve Labors.The