| Named By: | Harry Govier Seeley in 1895 |
| Time Period: | Middle Permian |
| Location: | South Africa - Pristerognathus Assemblage Zone (Beaufort Group) |
| Size: | Skull about 25 centimetres long. Body length about 1.5 meters long |
| Diet: | Carnivore |
| Fossil(s): | Few individuals mostly by skull material |
| Classification: | | Chordata | Synaspida | Therapsida | Therocephalia | Scylacosauridae | |
Pristerognathus is an extinct genus of therocephalian, known from the late Middle Permian (Capitanian) of South Africa. It lends its name to the Pristerognathus Assemblage Zone of the Beaufort Group of South African geological strata. Pristerognathus was a medium-sized therocephalian with a 25 cm skull and a total length up to 1.5 m (4.9 ft).
These animals were roughly dog-sized, and are characterized by long, narrow skulls with large canines. They are likely to have lived in woodlands,and preyed on smaller therapsids and millerettids of the time.
Pristerognathus was discovered in 1895 by Seeley.Three species are known: P. baini, P. polyodon and P. vanderbyli. There has also been a fourth species P. minor, but this has been moved to Pristerognathoides.