Underworld may refer to:
- The Underworld, the trope about the place after death.
- Underworld 1985
- Underworld (1927), a silent gangster picture from 1927.
- Underworld (2003), an action film series featuring vampires and werewolves.
- Underworld (2006), a superhero gangster story set in the Marvel Universe.
- The 1997 Don DeLillo novel.
- The Thomas Pynchon story story from the 1950s or 1960s.
- A British band.
- The Divinyls album.
- The tabletop game, UnderWorld: An Adventure Game of Subterranean Fantasy
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