Pliolymbus is a fossil genus of grebe known from the Late Pliocene to Early Pleistocene of United States and Mexico.

The specimens were collected in the summer of 1950 from Kansas, United States by Claude W. Hibbard and the species was named in 1967 by Bertram G. Murray.

The binomial nomenclature for the species means “heavy bone Pliocene diver” in reference of the age and skeletal features of the grebe.

[1] Howard (1969) published a specimen collected from Lake Chapala from a series of field surveys in the region from 1926, 1958 and 1963.

[1] However Olson (1985) question the validity of the genus and suggest Pliolymbus baryosteus might be a species of Podiceps instead.