Pseudophlegethontia is an extinct genus of aïstopod tetrapodomorphs.

Fossils of Pseudophlegethontia have been found from the Mazon Creek fossil beds in Grundy County, Illinois, a conservation lagerstätte well known for the exceptional preservation of middle Pennsylvanian taxa.

[1] Pseudophlegethontia has been considered to be morphologically intermediate between derived phlegethontiids and more basal "ophiderpetontids" such as Ophiderpeton.

It possesses basal characters such as a relatively short body, "k shaped" ribs, and distinctive skull roof bones while also possessing several more derived features such as a pointed snout, thin gastralia, and a lack of dorsal osteoderms.

[1] It is usually,[2][3] but not unanimously,[4] placed as the sister taxon to phlegethontiids, represented by Phlegethontia.