| Named By: | S. W. Shannon & K. R. Wright in 1988 |
| Time Period: | Late Cretaceous |
| Location: | USA, Alabama - Mooreville Chalk Formation, Kansas - Niobrara Formation |
| Size: | Uncertain |
| Diet: | Carnivore/Piscivore |
| Fossil(s): | At least two individuals but mostly of skull material |
| Classification: | | Chordata | Reptilia | Squamata | Mosasauridae | Plioplatecarpinae | |
Selmasaurus is an extinct genus of medium-sized plioplatecarpine mosasaur from the Late Cretaceous of the United States.