| Thiornis Temporal range:
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|---|---|
_(19765729204).jpg)
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| Fossil slab of Thiornis sociata | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Order: | Podicipediformes |
| Family: | Podicipedidae |
| Genus: | †Thiornis Navás, 1922 |
| Type species | |
| †Thiornis sociata | |
| Synonyms | |
|
Podiceps sociatus (Navás, 1922) sensu Olson, 1995 | |
Thiornis is a fossil genus of Middle Miocene grebe known from a nearly complete specimen from Libros, Spain. Originally classified as a type of moorhen, Thiornis has since been classified as a species of grebe. The overall anatomy of the bird is identical to modern grebes. It contains a single species, T. sociata.