Rileyasuchus (meaning "Riley’s crocodile") is a genus of phytosaur from the Rhaetian (Late Triassic) of England. It has a confusing history, being associated with the taxonomy of Palaeosaurus and Thecodontosaurus, and being a replacement name for a preoccupied genus (Rileya, which had already been used by Howard (or Ashmead; it's unclear which one has priority, but they apparently are the same animal) in 1888 for a hymenopteran).