| Named By: | Oscar Alcober & Ricardo Martinez in 2010 |
| Time Period: | Late Triassic, 231.4 Ma |
| Location: | Argentina, San Juan Province - Ischigualasto Formation |
| Size: | Estimated 3 meters long |
| Diet: | Carnivore |
| Fossil(s): | Partial skeleton with a jaw fragment |
| Classification: | | Chordata | Reptilia | Dinosauria | Theropoda | Eusaurischia | Herrerasauridae | |
Sanjuansaurus ("San Juan Province lizard") is a genus of herrerasaurid dinosaur from the Late Triassic-age Ischigualasto Formation of northwestern Argentina.