Darwinsaurus (meaning "Darwin's lizard") is a genus of herbivorous styracosternan ornithopod dinosaur. In the early nineteenth century dinosaur remains were discovered in the Shornden Quarry at Shornden near Hastings in East Sussex. These were first reported by Richard Owen in 1842. In 1889 they were referred to Iguanodon fittoni by Richard Lydekker. They were then assigned to Hypselospinus fittoni by David Bruce Norman in 2010. Paul considered Darwinsaurus a basal member of the Iguanodontia.