| Opalios Temporal range: Late Cretaceous (Cenomanian),
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|---|---|
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Monotremata |
| Superfamily: | Ornithorhynchoidea |
| Family: | †Opalionidae Flannery et al., 2024 |
| Genus: | †Opalios Flannery et al., 2024 |
| Species: | †O. splendens
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| Binomial name | |
| †Opalios splendens Flannery et al., 2024
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Opalios (meaning "opal") is an extinct genus of monotreme mammal from the Late Cretaceous (Cenomanian) Griman Creek Formation of Australia. The genus contains a single species, O. splendens, known from a fragmentary left dentary.