Pseudothurmannia is a genus of extinct cephalopods belonging to the subclass Ammonoidea and included in the family Crioceratitidae of the ammonitid superfamily Ancylocerataceae.

These fast-moving nektonic carnivores [1] lived in the Cretaceous period, from Hauterivian age to Barremian age.

[2] [3] Shell of Pseudothurmannia species can reach a diameter of about 4–12 centimetres (1.6–4.7 in).

They show flat or slightly convex sides, a surface with dense ribs and a subquadrate whorl section.

Fossils of species within this genus have been found in the Cretaceous rocks of Antarctica, Bulgaria, Czechoslovakia, France, Hungary, Italy, Japan, Morocco, Spain, Russia and United States.