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.
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