| Sanjuansaurus Temporal range: Carnian
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| Preserved bones of the holotype specimen | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Family: | †Herrerasauridae |
| Genus: | †Sanjuansaurus Alcober & Martinez, 2010 |
| Species: | †S. gordilloi
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| Binomial name | |
| †Sanjuansaurus gordilloi Alcober & Martinez, 2010
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Sanjuansaurus ("San Juan Province lizard") is a genus of herrerasaurid dinosaur from the Late Triassic (Carnian) Ischigualasto Formation of the Ischigualasto-Villa Unión Basin in northwestern Argentina.