Arctognathus is an extinct genus of gorgonopsids that throve during the Late Permian in the Karoo basin of what is now South Africa.
A carnivore, like all gorgonopsid, Arctognathus was given its name ("Bear jaw") in reference to its short and rounded snout. There is only one recognized species, A. curvimola.
It was a small gorgonopsid with a total length estimated at 1.1 m and an 18 cm skull.
Below is a cladogram from the phylogenetic analysis of Gebauer (2007):