| Named By: | J. F. Bonaparte, J. Ferigolo & A. M. Ribeiro in 2001 |
| Time Period: | Late Triassic, 225 Ma |
| Location: | Brazil - Caturrita Formation |
| Size: | Unavailable |
| Diet: | Uncertain |
| Fossil(s): | Based upon a partial skull, remains of several individuals are now known |
| Classification: | | Chordata | Synapsida | Therapsida | Cynodontia | Tritheledontidae | |
Riograndia is a genus of tritheledontid cynodont from the Late Triassic of South America. The type and only species is Riograndia guaibensis. Remains have been found in the Caturrita Formation of the geopark of Paleorrota. It was a small non-mammalian cynodont several advanced features also present in mammals. Several specimens of Riograndia guaibensis have been found in the towns of Candelaria and Faxinal do Soturno in the Caturrita Formation.