| Diphydontosaurus Temporal range: Late Triassic,
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| Skull of D. avonis in lateral view | |
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| Lombary specimen of Diphydontosaurus sp. | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Order: | Rhynchocephalia |
| Genus: | †Diphydontosaurus Whiteside, 1986 |
| Species: | †D. avonis
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| Binomial name | |
| †Diphydontosaurus avonis Whiteside, 1986
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Diphydontosaurus is an extinct genus of small rhynchocephalian reptile from the Late Triassic of Europe. It is the most primitive known member of Sphenodontia.