Osteocephalus fuscifacies is a species of frog in the family Hylidae endemic to Ecuador. It is known from the Napo River drainage at intermediate elevations (250–950 m (820–3,120 ft) asl). The specific name fuscifacies is derived from Latin fuscus (=tan) and facies (=face), in reference to the uniform tan-colored loreal region and the lack of a light subocular spot. Common name Napo slender-legged treefrog has been coined for this species.

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