Nomingia is a genus of theropod dinosaur from the Late Cretaceous Period. It was discovered in the Bugin Tsav Beds around the Gobi Desert. It is named for the Nomingiin Gobi, which is part of the nearby Gobi Desert. It was described in 2000 based on several skeletal fragments. The type species is N. gobiensis.
Nomingia was a medium-sized theropod with beaked jaws and possibly a display crest. Nomingia is characterized by the fused vertebrae at the end of the tail that forms a unique mass. This mass may have supported a feather fan, like that of the Caudipteryx. Before this fossil was discovered, the unique bone structure was thought to only exist in birds.