Wannchampsus ("Wann Langston, Jr.'s crocodile") is an extinct genus of paralligatorid neosuchian, close to but not a true crocodilian.

It is known from fossils discovered in Lower Cretaceous rocks in north-central Texas, United States.

This fossil is attached by matrix to another partial skull of the same genus and species, SMU 76605.

These fossils were found in rocks of the late Aptian-age Lower Cretaceous Twin Mountains Formation, southwest of Stephenville, in Comanche County, Texas; the site is otherwise known as the Proctor Lake dinosaur locality.

Adams performed a phylogenetic analysis and found Wannchampsus kirpachi to be a derived paralligatorid, closely related to the "Glen Rose form", which he regarded as belonging to the genus Wannchampsus.