Aplastodiscus leucopygius is a species of frog in the family Hylidae,[2] endemic to Brazil.

The iris is golden, tinged with orange around the edge, and the tympanum is clearly visible.

The fingers and toes have large discs on the tips to help the frog retain grip when climbing.

[3] A. leucopygius is an arboreal species and is endemic to the mountains near the south-eastern coast of Brazil at altitudes of 800 to 1,600 metres (2,600 to 5,200 ft) above sea level.

This ends with the inspection by the female of an underground nesting chamber already prepared in a wet, muddy place by the male.