Colognathus
| Colognathus Temporal range: Late Triassic,
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| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Order: | incertae sedis |
| Family: | †Colognathidae |
| Genus: | †Colognathus Case, 1933 |
| Type species | |
| †Xenognathus obscurus Case, 1928
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| Synonyms | |
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Colognathus is an extinct genus of enigmatic reptile from Late Triassic (Norian age) rocks of the southwestern United States. The genus contains a single species, Colognathus obscurus, described in 1928 by Ermine C. Case based on a jaw fragment. Case interpreted the specimen as belonging to a unique form of fish. Later analyses suggested possible relationships with procolophonid 'parareptiles. Alongside the German Quasicolognathus, it is currently placed in the family Colognathidae, the relationships of which are unclear.