| Named By: | D. A. Russel in 1967 |
| Time Period: | 100 Ma Late Cretaceous |
| Location: | USA, Kansas |
| Size: | Skull roughly 74 centimetres long |
| Diet: | Carnivore/Piscivore |
| Fossil(s): | Skull and forward half of the post cranial skeleton |
| Classification: | | Chordata | Reptilia | Squamata | Mosasauridae | Plioplatecarpinae | |
| Also known as: | | Clidastes velox | Platecarpus oxyrhinus | |
Ectenosaurus is a genus of mosasaur from the Late Cretaceous period.