See text Ololygon is a genus of frogs in the family Hylidae.

[1] The majority of species in it are endemic to the Atlantic Forest of eastern Brazil,[1] although the range of some species, including Ololygon aromothyella and Ololygon berthae, is known to extend south to northeastern Argentina, southern Paraguay, and Uruguay.

[2][3] The following species are recognized in the genus Ololygon:[1]