Proceratosaurus bradleyi was a small theropod dinosaur that hunted in Europe around 166 million years ago, during the Middle Jurassic Period. Once thought to have been an ancestor to the larger horned predator Ceratosaurus due to fragments of a crest being found on its head, Proceratosaurus is now thought to have been more closely related to theropods of the coelurosaur lineage like Yutyrannus and Guanlong.