| Named By: | Harry Govier Seeley in 1895 |
| Time Period: | Early - Middle Triassic, 247-237 Ma |
| Location: | Antarctica, Argentina, China, South Africa |
| Size: | Body length up to 1 meter long, Skull up to 30 centimetres long |
| Diet: | Carnivore |
| Fossil(s): | Multiple fossils, Cynognathus is one of the most numerous and completely reconstructed cynodonts |
| Classification: | | Chordata | Synapsida | Therapsida | Cynodontia | |
| Also known as: | | Cistecynodon parvus | Cynidiognathus broomi | Cynidiognathus longiceps | Cynidiognathus merenskyi | Cynognathus beeryi | Cynognathus minor | Cynognathus platyceps | Cynogomphius berryi | Karoomys browni | Lycaenognathus platyceps | Lycochampsa ferox | Lycognathus ferox | |
Cynognathus is an extinct genus of large-bodied cynodont therapsid that lived in the Early and Middle Triassic. It is known from a single species, Cynognathus crateronotus. Cynognathus was a 1.2 meter-long predator closely related to mammals and had an almost worldwide distribution. Fossils have so far been recovered from South Africa, South America, Antarctica, and Western Africa.