Gargoyleosaurus, meaning “gargoyle lizard”, is a genus of ankylosaurid dinosaur from the Late Jurassic Period (Kimmeridgian and Tithonian ages) and found in the Morrison Formation. It was discovered in 1996 at the Bone Cabin Quarry West in Albany County, Wyoming. A skeletal reconstruction is currently on display at the Denver Museum of Nature and Science. It was officially described by Ken Carpenter and his colleagues in 1998 and given the species name G. parkpini. It was renamed G. parkpinorum in 2001 under the authority of the ICZN.
The head of Gargoyleosaurus measured 11 inches long and the total body length was an estimated 10 to 13 feet. It weighed as much as 2,200 pounds.