The Teratophoneus (meaning "monstrous murderer") is a genus of carnivorous tyrannosaurid theropod dinosaur which lived during the late Cretaceous period (late Campanian age, about 75 million years ago) in what is now Utah, USA. It is known from an incomplete skull and postcranial skeleton recovered from the Kaiparowits Formation. Teratophoneus was named by Thomas D. Carr, Thomas E. Williamson, Brooks B. Britt and Ken Stadtman in 2011 and the type species is T. curriei. The generic name is derived from Greek teras, "monster", and phoneus, "murderer". The specific name honors Philip J. Currie.