| Acleistorhinus Temporal range: 273.6–271.6 Ma | |
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| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Sauropsida |
| Clade: | Parareptilia |
| Order: | Procolophonomorpha |
| Family: | Acleistorhinidae |
| Genus: | Acleistorhinus |
| Type species | |
| Acleistorhinus pteroticus | |
Acleistorhinus (meaning "unclosed nose") is an extinct genus of procolophonomorph parareptile known from the Early Permian in what is now Oklahoma, North America.