Deinodon, which translates to "terrible tooth" in Greek, is a controversial genus within the tyrannosaurid dinosaur family. It encompasses a single species, Deinodon horridus. D. horridus is solely represented by a collection of teeth discovered in the Late Cretaceous Judith River Formation of Montana. These teeth were originally documented by paleontologist Joseph Leidy in 1856 and were recovered by Ferdinand Vandeveer Hayden.

The teeth of Deinodon displayed slight heterodonty, and it is highly likely that the holotype teeth initially assigned to Aublysodon actually belong to Deinodon. Subsequent findings have suggested that the fossilized teeth attributed to D. horridus are more likely to be associated with the dinosaur now identified as Gorgosaurus libratus. In a study conducted in 1922 by William Diller Matthew and Barnum Brown, it was determined that the teeth of D. horridus and G. libratus were nearly identical and almost certainly belonged to the same species.