Abrictosaurus  was a bipedal heterodontosaurid from the Late Triassic to the Early Jurassic red sandstones of Lesotho, South Africa. It was an herbivore with high-crowned teeth. Unlike other heterodontosaurids, it lacked canine-like teeth on its lower jaw.

Abrictosaurus ["awake lizard"] (the skull without tusks) may be a female, while Heterodontosaurus (with the tusks) is a male of the same species. 2 skulls and 1 associated fragmentary skeleton [UCL B54 [holotype]: partial skeleton, UCL A.100: partial skull] It measured approximately 1,2 meter length and 1 meter top and weighed around 43 kg.

The name expresses J. A. Hopson's "disagreement with [R. A.] Thulborn's suggestion that heterodontosaurids underwent aestivation (or hibernation) during the yearly dry season," based on the supposed replacement pattern of their teeth. Abrictosaurus was active year-round in Hopson's view.