| Named By: | Karl Eichwald in 1860 |
| Time Period: | Capitanian |
| Location: | Russia |
| Size: | Largest skulls about 80 centimetres long. Total body length estimated at somewhere between 5-6 meters long |
| Diet: | Herbivore/Omnivore |
| Fossil(s): | Mostly skulls |
| Classification: | | Chordata | Synapsida | Therapsida | Dinocephalia | Anteosauroidea | |
| Also known as: | | Deuterosaurus mnemonialis | Eurosaurus verus | Mnemeiosaurus jubilaei | Uraniskosaurus watsoni | |
Deuterosaurus is a genus of dinocephalian therapsid, one of the nonmammalian synapsids dominating the land during the late Palaeozoic.