MonsterQuest (sometimes written as Monsterquest or Monster Quest) is an American television series that originally aired from October 31, 2007 to March 24, 2010 on the History Channel channel. Produced by Whitewolf Entertainment, the program deals with the search for various monsters of interest to the cryptozoology subculture and paranormal entities reportedly witnessed around the world. A spin-off show, MysteryQuest, which focuses on unsolved mysteries, premiered on September 16, 2009.

The purpose of the show is best described by the narrator, Stan Bernard, in the introduction:

Witnesses ("People" for Season 4) around the world report seeing monsters. Are they real or imaginary? Science searches for answers...on MonsterQuest.

History channel revived the MonsterQuest series for special episodes beginning on August 28, 2020. These special episodes did not feature new investigations but instead compiled scenes from the previous four seasons.