| Cynognathus Temporal range: Middle Triassic,
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| Fossil skull of Cynognathus | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Synapsida |
| Clade: | Therapsida |
| Clade: | Cynodontia |
| Clade: | †Cynognathia |
| Family: | †Cynognathidae Seeley, 1895 |
| Genus: | †Cynognathus Seeley, 1895 |
| Type species | |
| †Cynognathus crateronotus Seeley, 1895
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Cynognathus is an extinct genus of large-bodied cynodontian therapsids that lived in the Middle Triassic. It is known from a single species, Cynognathus crateronotus. Cynognathus was a predator closely related to mammals and had a southern hemispheric distribution. Fossils have so far been recovered from South Africa, Argentina, Antarctica, and Namibia.