| Named By: | J. F. Bonaparte in 1969 |
| Time Period: | Late Triassic, 217-215 Ma |
| Location: | Argentina - Los Colorados Formation |
| Size: | Skull 25 centimetres long. Roughly estimated to be about 2 meters long |
| Diet: | Carnivore |
| Fossil(s): | Based upon almost compete skull and partial post cranial skeletal remains. Fossil remains of at least four individuals are now known |
| Classification: | | Chordata | Reptilia | Archosauria | Pseudosuchia | Ornithosuchidae | |
Not to be confused with the sauropodomorph dinosaur, Riojasaurus
Riojasuchus is an extinct genus of quadrupedal crurotarsan archosaur. Riojasuchus is a member of Ornithosuchidae, a family of facultatively bipedal carnivores that were geographically widespread during the Late Triassic. Two other genera, Ornithosuchus and Venaticosuchus, are currently known. The holotype specimen is PVL 3827. It was found in the Los Colorados Formation.