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Temporal range: Upper Triassic, 228–216.5 mya
Pisanosaurus NT small.jpg
Lise reconstruction of Pisanosaurus mertii
Scientific classification
Kingdom: Animalia
Phylum: Chordata
(unranked): Dinosauromorpha
(unranked): Dinosauriformes
Family: Pisanosauridae
Casamiquela, 1967
Genus: Pisanosaurus
Casamiquela, 1967

Pisanosaurus (meaning "Pisano lizard") is a genus of dinosauriforme 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 was once classified as the oldest known ornithischian dinosaur but a 2017 study had disproven this.