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Temporal range: Upper Jurassic 155–145 mya
Dryosaurus (left) and Ceratosaurus (right)
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Superorder: Dinosauria
Order: Ornithischia
Suborder: Cerapoda
Infraorder: Ornithopoda
Superfamily: Iguanodontia
Family: Dryosauridae
Genus: Dryosaurus
Marsh, 1878

D. altus
D. lettowvorbecki

Dryosaurus was a small plant-eating ornithopod dinosaur that lived in forests around 150 million years ago.

Its family, the Dryosauridae, were precursors (ancestors) of the Iguanodons, and lived from the Middle Jurassic to the Lower Cretaceous.