| Named By: | J. R. Bolt & S. Chatterjee in 2000 |
| Time Period: | Late Triassic |
| Location: | USA, Texas - Cooper Canyon Formation |
| Size: | Unavailable |
| Diet: | Carnivore/Piscivore |
| Fossil(s): | Almost complete skull |
| Classification: | | Chordata | Amphibia | Temnospondyli | Stereospondyli | Metoposauroidea | |
Rileymillerus is an extinct genus of temnospondyl amphibian from the Late Triassic of Texas. It is closely related to metoposaurids.