Dromaeosaurus, whose name means "running lizard," is a genus of dromaeosaurid theropod dinosaur that lived between 80 and 69.1 million years ago, during the Late Cretaceous, specifically between the Campanian and Maastrichtian, in what is now North America.

The type species is Dromaeosaurus albertensis, which was described by William Diller Matthew and Barnum Brown in 1922. Its fossils have been unearthed in the Dinosaur Park Formation, the Hell Creek Formation, and the Horseshoe Canyon Formation.

The earliest known remains of Dromaeosaurus were discovered by paleontologist Barnum Brown during a 1914 expedition to the Red Deer River on behalf of the American Museum of Natural History. The area where these bones were collected is now part of Dinosaur Provincial Park in Alberta, Canada.

Dromaeosaurus was a medium-sized carnivore, about 2 meters long and 16 kg in body mass. Its mouth was full of sharp teeth, and it likely had a highly curved sickle-shaped claw on each foot.

It had a relatively robust skull with a deep snout. Its teeth were quite large and curved cone-shaped with a layer of enamel covering the crown. It had only nine teeth in each jaw. Dromeosaurus also had a vein at the back of its head, the vena capitis dorsalis, which drained the front neck muscles through two long canals that ran to the back surface of the brain. The Meckelian groove of Dromeosaurus is quite shallow and does not have much depth.