Potamarius izabalensis is a species of catfish in the family Ariidae.

[2] It was described by Carl Leavitt Hubbs and Robert Rush Miller in 1960, originally under the genus Arius.

[1] It is known to inhabit Izabal Lake in Guatemala, and possibly also inhabits the Polochic River.

It reaches a maximum standard length of 44 cm (17 in).

This Ariidae-related article is a stub.