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Temporal range: Upper Triassic, 228–216.5 mya
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Superorder: Dinosauria
Order: Ornithischia
Family: Pisanosauridae
Casamiquela, 1967
Genus: Pisanosaurus
Casamiquela, 1967

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.