Underdark (disambiguation)

Underdark might refer to:


 * The Underdark, a subterranean realm renowned for being the home of the drow and other evil beings
 * Underdark (sourcebook), the 2003 3rd edition sourcebook about the Underdark
 * Underdark (4th edition sourcebook), the 2010 4th edition sourcebook about the Underdark
 * The Underdark, a tavern in the Trades Ward of Waterdeep