Hypsognathus NT small
A restoration of Hypsognathus fenneri
Scientific classification
Kingdom: Animalia
Class: Reptilia
clade: Parareptilia
Order: Procolophonomorpha
Family: Procolophonidae
Subfamily: Leptopleuroninae
Genus: Hypsognathus
Gilmore, 1928
Species: H. fenneri
Binomial name
Hypsognathus fenneri
Gilmore, 1928

Hypsognathus fenneri (meaning "high jaw") is a 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.