| Named By: | Robert Broom in 1903 |
| Time Period: | Early Triassic, 252-250 Ma |
| Location: | China, South Africa |
| Size: | Between 1.5 to 2.2 meters long |
| Diet: | unavailable |
| Fossil(s): | Known from several specimens |
| Classification: | | Chordata | Sauropsida | Diapsida | Archosauromorpha | Archosauriformes | Proterosuchidae | |
| Also known as: | | Chasmatosaurus | Elaphrosuchus | |
Proterosuchus is an extinct genus of Early Triassic archosauriform reptiles. Remains have been found from South Africa and China. The genus Chasmatosaurus is a junior synonym of Proterosuchus, as all species of Chasmatosaurus, including C. aleandri, C. vanhoepeni, and C. yuani, have been reassigned to Proterosuchus. Elaphrosuchus has also been synonymized with Proterosuchus. The type species of Proterosuchus is P. fergusi. The Chinese species is P. yuani.