Dromaeosaurus (/ˌdroʊmiəˈsɔːrəs, -mioʊ-/, "swift running lizard") is a genus of theropod dinosaur which lived during the Late Cretaceous period (middle late Campanian), sometime between 80 and 69 million years ago, in Alberta, Canada and the western United States. The type species is Dromaeosaurus albertensis, which was described by William Diller Matthew and Barnum Brown in 1922. Its fossils were unearthed in the Dinosaur Park Formation. Teeth attributed to this genus have been found in the Prince Creek Formation. Dromaeosaurus is the type genus of both Dromaeosauridae and Dromaeosaurinae, which include many genera with similar characteristics to Dromaeosaurus such as Dakotaraptor, its closest relative.