| Protognathosaurus Temporal range: Middle Jurassic |
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| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Sauropsida |
| Superorder: | Dinosauria |
| Order: | Saurischia |
| Suborder: | Sauropodomorpha |
| Infraorder: | Sauropoda |
| Family: | Euhelopodidae |
| Genus: | Protognathosaurus Olshevsky, 1991 |
| Species | |
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Protognathosaurus (meaning "early jaw lizard") is a genus of dinosaur from the Middle Jurassic. It was a sauropod found in what is present-day China. The type species, P. oxyodon, was originally described by Zhang (1988) (as Protognathus, which was already in use for a genus of beetle), and was renamed by George Olshevsky in 1991. Protognathosaurus is known only from a fragmentary jaw.