| Named By: | Charles W. Gilmore in 1928 |
| Time Period: | Late Triassic |
| Location: | USA, Conneticut - New Haven Formation and New Jersey - Passaic Formation, and Canada, Nova Scotia - Blomidon Formation & Wolfville Formation |
| Size: | 33 centimetres long |
| Diet: | Herbivore |
| Fossil(s): | Several individuals |
| Classification: | | Chordata | Reptilia | Procolophonomorpha | Procolophonidae | Leptopleuroninae | |
Hypsognathus ('high jaw') is an extinct genus of procolophonid parareptile from the Late Triassic of New Jersey and Connecticut.
Hypsognathus resembled a moderately sized lizard, with a length of 33 centimetres (13 in), although it was unrelated to modern lizards. Because of its broad teeth, Hypsognathus is thought to have been a herbivore. Its body is low and broad and it has a relatively short tail. Hypsognathus has some spikes on the side of its head, probably for protection against predators.