This disambiguation page lists articles associated with the same or a similar title.
Hydra might refer to:
- Hydra (constellation) [r]: Stellar onstellation in the equatorial region of the southern sky near Cancer, Libra, and Centaurus, from Greek (water snake). [e]
- Lernaean Hydra [r]: In Greek mythology, a giant water snake with many heads killed by Herakles. [e]