| Promastodonsaurus Temporal range: Carnian
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Order: | †Temnospondyli |
| Suborder: | †Stereospondyli |
| Clade: | †Capitosauria |
| Family: | †Mastodonsauridae |
| Genus: | †Promastodonsaurus Bonaparte 1963 |
| Type species | |
| †Promastodonsaurus bellmani Bonaparte 1963
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Promastodonsaurus ("before Mastodonsaurus") is an extinct genus of capitosauroid temnospondyls within the family Mastodonsauridae.[1] Fossils of the genus were found in the Ischigualasto Formation of the Ischigualasto-Villa Unión Basin in northwestern Argentina.[2]