The Moaif tree frog (Litoria mystax) is a species of frog in the subfamily Pelodryadinae, endemic to West Papua, Indonesia.

Its natural habitat is subtropical or tropical moist lowland forests.

Litoria mystax is part of the species-group L. bicolor, which was created to accommodate 7 species from the region that had characteristics in common.

The other members of the group are: Litoria cooloolensis and Litoria fallax in Australia; Litoria bicolor in Austrália and Papua New Guine; Litoria bibonius, Litoria contrastens, Litoria longicrus and Litoria mystax in Papua New Guine.

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