Leucostethus fugax is a species of frog in the family Dendrobatidae. It is endemic to the valley of Pastaza River, on the eastern slope of the Cordillera Oriental, southern Ecuador. Its natural habitats are moist forests, in a transition zone between humid tropical forest and very humid premontane forest. It is threatened by habitat loss. References fugax Amphibians of the Andes Amphibians of Ecuador Endemic fauna of Ecuador Amphibians described in 1993 Taxonomy articles created by Polbot