| Named By: | Richard Owen in 1851 |
| Time Period: | Upper Cretaceous |
| Location: | England |
| Size: | Around 1.5 meters long |
| Diet: | Carnivore/Piscivore |
| Fossil(s): | Partial remains |
| Classification: | | Chordata | Reptilia | Squamata | Scleroglossa | Dolichosauridae | |
Dolichosaurus (meaning "long lizard") is an extinct genus of marine squamate of the Upper Cretaceous Cenomanian chalk deposits of England. Sister-group relationships between coniasaurs, dolichosaurs, Aigialosauridae and Mosasauridae are an unresolved polytomy. The paleobiology of Dolichosaurus is reconstructed as similar to coniasaurs, nothosaurs, and modern sea snakes.