The Underdark is a fictional setting which has appeared in Dungeons & Dragons role-playing campaigns and Dungeons & Dragons-based fiction books, including the Legend of Drizzt series by R. A. Salvatore. It is described as a vast subterranean network of interconnected caverns and tunnels, stretching beneath entire continents and forming a literal underworld for whichever surface setting it is added to.

The Underdark is featured prominently in the campaign settings World of Greyhawk and the Forgotten Realms. The concept of a dungeon that spanned a planet was first introduced by Gary Gygax in his D-series of game modules and at the end of the G-series. The Underdark is described in detail in the 1986 manual Dungeoneer's Survival Guide, by Doug Niles.

It is also a part of Eberron, in which it is called Khyber and is home to a host of evil beings driven deep into the caverns at the end of the age of demons. Much of the literary attention for this deep underworld setting was received in the sourcebooks and accessories for the Forgotten Realms setting. R.A. Salvatore's novels about the fictional character Drizzt Do'Urden originated much of this development. Some other sources of information about the Underdark are more generic; these may not specifically refer to the Forgotten Realms at all.

The Underdark is also the setting for the expansion pack to the computer game Neverwinter Nights called Hordes of the Underdark, which features the port city of Lith My'athar, and the mysterious Seer.

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