| Named By: | R. C. Wood in 1970 |
| Time Period: | Late Miocene-Early Pliocene (Huayquerian-Montehermosan)~9.0-5 Ma |
| Location: | Venezeula - Urumaco Formation and Brazil - Solimoes Formation |
| Size: | Preserved length of carapace of largest individual 1.8 meters long. Estiamted length of shell up to 3.3 meters long |
| Diet: | Uncertain |
| Fossil(s): | Remains of two species, including the carapace |
| Classification: | | Chordata | Reptilia | Anapsida | Testudines | Pleurodira | Pelomedusoidea | Podocnemididae | |
Stupendemys is a prehistoric genus of freshwater turtle. Its fossils have been found in northern South America, in rocks dating from the late Miocene to the very start of the Pliocene, about 6 to 5 million years ago.