Underground has several referrals:
- The Underground, a vast series of subterranean passages deep below Sinnoh in Pokémon Diamond, Pearl, and Platinum.
- Grand Underground, the Underground's replacement in Pokémon Brilliant Diamond and Shining Pearl.
- Underground Path (Kanto Routes 5–6) and Underground Path (Kanto Routes 7–8), both in Kanto, which allow passage below Saffron City.
- Goldenrod Tunnel, a shopping district that runs below Goldenrod City. It was originally called "the Underground" in Generation II.
- The Under, a town in Orre.
- Waterworks, the location of an important Pokémon Ranger mission in Fiore, which is known as Underground Waterworks (Japanese: ちかすいどう) in the Japanese version.
It can also refer to: