Stereognathus is an extinct genus of tritylodontid cynodonts from the Middle Jurassic of the United Kingdom.

A second species, S. hebridicus, was named after the Hebrides in Scotland, where it was found; it was synonymized with S. ooliticus in 2017.

[2] S. ooliticus was the first tritylodontid species ever found, being described by Charlesworth in 1855[3] and later by Sir Richard Owen.

[4] In 1972, S. hebridicus was named from several postcanine teeth recovered in Bathonian age deposits on the Isle of Skye in Scotland by palaeontologists R. J. G. Savage and Michael Waldman.

[5] Despite being the first tritylodontid genus found and named, Stereognathus remains poorly represented, being known mainly from isolated molar teeth.