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Hydra may refer to the following:
- Hydra (code) - A UNSC code word for biological threats.
- Hydra system - A colony system of the UNSC.
- Hydra System Massacres - A group of conflicts in UNSC history.
- Multiple Launch Rocket System-1 Hydra Gyroc Launcher - A missile launcher introduced in Halo 5: Guardians.
- This is a disambiguation page - a navigational aid which lists other pages that might otherwise share the same title. If an article link referred you here, you might want to go back and fix it to point directly to the intended page.