| Named By: | T. Konishi & M. W. Caldwell in 2011 |
| Time Period: | Late Cretaceous, 88-84 Ma |
| Location: | USA |
| Size: | Roughly estimated to be about 4.8-5 meters long |
| Diet: | Carnivore/Piscivore |
| Fossil(s): | Several individuals, some almost complete |
| Classification: | | Chordata | Reptilia | Squamata | Mosasauridae | Plioplatecarpinae | Plioplatecarpini | |
| Also known as: | | Clidastes planifrons | Platecarpus planifrons | |
Plesioplatecarpus is an extinct genus of plioplatecarpine mosasaur known from the Late Cretaceous (middle Coniacian to middle Santonian stage) of the northern Gulf of Mexico and the Western Interior Basin of North America.