Scinax fuscomarginatus is a species of frog in the family Hylidae. It is found in northwestern Argentina, Paraguay, eastern Bolivia, southern, central, and eastern Brazil, and in scattered localities in the lowlands of eastern Venezuela and savannas of Guyana and southern Surinam as well as adjacent Brazil. As currently defined, it is one of most widespread Neotropical frogs; the northernmost records refer to what was formerly recognized as Scinax trilineatus. Common name brown-bordered snouted treefrog has been coined for this species.