Callulops marmoratus is a species of frog in the family Microhylidae.

It is endemic to Papua New Guinea and only known from its type locality, Crater Mountain Wildlife Management Area in the southwestern Chimbu Province,[3] on the southern escarpment of the New Guinea Highlands.

Both fingers and toes are unwebbed but have moderately enlarged disks.

[2] The type series was collected from an evergreen/submontane hill forest at 850–900 m (2,790–2,950 ft) above sea level.

Thus, the species appears to be terrestrial or fossorial, in agreement with its morphology.