| Named By: | Oskar Kuhn in 1961 |
| Time Period: | Late Triassic |
| Location: | England |
| Size: | Unknown due to lack of remains |
| Diet: | Carnivore/Piscivore |
| Fossil(s): | Two vertebrae and a humerus have been attributed to the genus |
| Classification: | | Chordata | Reptilia | Archosaouromorpha | Phytosauria | |
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).