Tochisaurus (meaning "Tochi lizard") is a genus of small theropod dinosaur. It lived during the Late Cretaceous Period. Its fossils, consisting solely of the metatarsus, were found in Mongolia. The type (and only known) species is T. nemegtensis, formalized by Kurzanov and Osmólska in 1991. Based on the partial fossils, Tochisaurus is thought to have been a troodontid.