Pontoleon magnus True, 1905 Pontolis is an extinct genus of large walrus.

Pontolis lived along the Pacific coast of North America along what is now the western coasts of California and Oregon between 11.608 and 5.332 million years ago, during the Miocene and Pliocene.

Pontolis reached more than 4 m (13 ft) in body length,[4] rivaling the extant southern elephant seal as the largest pinniped[5] and member of the order Carnivora of all time.

Weight estimates for Pontolis range between 2,000 to 4,000 kg (4,400 to 8,800 lb).

This article related to prehistoric animals from order Carnivora is a stub.