The Citadel may refer to:
- Citadel (level) - One of the Halo 3 DLC maps.
- Covenant citadel - The Covenant structure used in Halo Wars.
- Citadel (Forerunner) - The Forerunner structure located on the Ark.
- Battle of the Citadel - The last major battle to be fought in the Human-Covenant war.
- The Citadel Skull achievement - Claimed by obtaining the Citadel Skull.
- 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.