| Phreatosaurus Temporal range: Permian
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Synapsida |
| Clade: | Therapsida |
| Suborder: | †Dinocephalia |
| Family: | †Phreatosuchidae |
| Genus: | †Phreatosaurus Efremov, 1954 |
| Species | |
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Phreatosaurus is an extinct genus of basal dinocephalian therapsids.