Dromaeosaurus was a genus of theropod dinosaur which lived during the Late Cretaceous period (middle late Campanian), sometime between 76.5 and 74.8 million years ago, in the western United States and Alberta, Canada. The name means 'running lizard' and is derived from the Greek dromeus (δρομευς) meaning 'runner' and sauros (σαυρος) meaning 'lizard'.