Pisanosaurus
| Pisanosaurus Temporal range: Upper Triassic, 228–216.5 mya
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| Family: | Pisanosauridae Casamiquela, 1967
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| Genus: | Pisanosaurus Casamiquela, 1967
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Pisanosaurus (meaning "Pisano lizard") is a genus of primitive ornithischian dinosaur from the Upper Triassic of what is now South America. It was a bipedal herbivore described by Argentine paleontologist Rodolfo Casamiquela in 1967. Only one species the type, Pisanosaurus mertii, is known, based on a single partial skeleton.
It is the oldest known ornithischian.
