Dinodontosaurus (meaning "terrible-toothed lizard") is a genus of dicynodont therapsid.

It was medium to large dicynodont of the Triassic (with skull up to 40 centimetres (16 in) long[1]) and had a beak corneum.

It lived in the Middle Triassic but disappeared in the Upper Triassic.

Dinodontosaurus in a cladogram from Szczygielski & Sulej (2023):[3] Rhinodicynodon Tetragonias Shansiodon Vinceria Dinodontosaurus Dolichuranus Acratophorus Rabidosaurus Wadiasaurus Sinokannemeyeria Parakannemeyeria Xiyukannemeyeria Rhadiodromus Shaanbeikannemeyeria Kannemeyeria Rechnisaurus Uralokannemeyeria Angonisaurus Woznikella Stahleckeriidae