| Named By: | Meyer in 1839 |
| Time Period: | Middle Triassic, Anisian-Ladinian |
| Location: | Europe |
| Size: | Around 3 meters long |
| Diet: | Piscivore |
| Fossil(s): | At least two individuals |
| Classification: | | Chordata | Reptilia | Sauropterygia | Pistosauroidea | |
Pistosaurus is an extinct genus of aquatic sauropterygian reptile closely related to plesiosaurs. Fossils have been found in France and Germany, and date to the Middle Triassic. It contains a single species, Pistosaurus longaevus