Udûn may mean:
In Tolkien's Middle-earth writings
- Udûn, Iron Mountains, also called Utumno, the underground fortress of Morgoth in the Age of the Lamps, before the First Age of Middle-earth
- Udûn, Mordor, the plain by the Black Gate at the northwestern point of Mordor in the Third Age
In motion pictures
- Udûn, an episode in the streaming series The Lord of the Rings: The Rings of Power
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