Unknown Dungeon can refer to four different locations:
- Cerulean Cave, a cave in the Kanto region.
- Nameless Cavern, a cave in the Hoenn region in Pokémon Omega Ruby and Alpha Sapphire.
- Unknown Dungeon (Kalos), a cave in the Kalos region.
- Unknown Dungeon (Mystery Dungeon), a wireless feature in Pokémon Mystery Dungeon: Blue Rescue Team.