| Named By: | Li in 2003 |
| Time Period: | Anisian, 244 Ma |
| Location: | China, Guizhou Province |
| Size: | 3 meters long |
| Diet: | unavailable |
| Fossil(s): | Initially a skull, A second specimen included much of the post cranial skeleton |
| Classification: | | Chordata | Reptilia | Diapsida | Archosauromorpha | Prolacertiformes | Tanystropheidae | |
Dinocephalosaurus (meaning "terrible-headed reptile") is a genus of long necked, aquatic protorosaur that inhabited the Triassic seas of China. Specimens belonging to the genus were discovered near Xinmin in Guizhou Province, China in 2002.