Ultima Underworld (disambiguation)

and refer to:
 * The first two parts of the series:
 * Ultima Underworld: The Stygian Abyss
 * Ultima Underworld II: Labyrinth of Worlds
 * Although less commonly, it could include two other games:
 * Ultima Underworld III
 * Underworld Ascendant
 * Ultima Underworld: The Stygian Abyss