Pristimantis acuminatus is a species of frog in the family Strabomantidae. It is found in the Amazon rainforest of Ecuador, northern Peru, and adjacent Colombia and Brazil. It is a lowland Amazonian rainforest species that also occurs on the lower reaches of the Andes. At night these frogs can be found perched on leaves some above the ground; during the daytime they may be found in bromeliads or sleeping on the undersides of leaves. It may also occur in cultivated areas. This widespread species is not considered threatened.