Homalocephale (from Greek ωμαλος, homalos, "even", and κεφαλή, kephalē, "head") is a genus of dinosaur belonging to the pachycephalosaurid family, which lived during the late Cretaceous period. The genus was described in 1974 by Osmólska & Maryañska, and consists of a single species, the 3 meters (10 ft) long herbivore Homalocephale calathocercos. Homalocephale lived in what is now Mongolia, 80 million years ago.