Ornithodesmus (meaning "bird link") is a genus of small, coelurosaurian dinosaur that lived in England 130 million years ago. The name was originally assigned to a bird-like sacrum (a series of vertebrae fused to the hip bones), initially believed to come from a pterosaur. More pterosaur remains were later assigned to Ornithodesmus, until it was determined that the original specimen in fact came from a small coelurosaur, possibly a troodontid or dromaeosaurid. All pterosaurian material previously assigned to this genus has been re-named Istiodactylus.