| Chthonosaurus Temporal range: Late Permian | |
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| A restoration of Chthonosaurus velocidens | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| clade: | Synapsida |
| Order: | Therapsida |
| Suborder: | †Therocephalia |
| Family: | †Akidnognathidae |
| Genus: | †Chthonosaurus Vjuschkov, 1955 |
| Type species | |
| †Chthonosaurus velocidens Vjuschkov, 1955 | |
Chthonosaurus is a Therocephalian Therapsid from late Permian Russia.