| Rhea fossilis Temporal range:
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|---|---|
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| Illustrations of various bird fossils from the 1891 "Annuals of the La Plata Museum", the Rhea fossilis specimens are the two long bones in the second column. | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Infraclass: | Palaeognathae |
| Order: | Rheiformes |
| Family: | Rheidae |
| Genus: | Rhea |
| Species: | †R. fossilis
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| Binomial name | |
| †Rhea fossilis Moreno & Mercerat 1891
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Rhea fossilis is an extinct species of bird in the genus Rhea that inhabited the Southern Cone of South America during the Neogene period. Its closest living relatives are the greater rhea and the lesser rhea.