Gastrotheca lateonota (common name: El Tambo marsupial frog) is a species of frog in the Hemiphractidae family. It is known from its type locality, El Tambo near Canchaque, Cordillera de Huancabamba, at an elevation of 2,770 m (9,090 ft) asl in Peru, and from the area of Chillacoche in the El Oro Province of Ecuador. Its natural habitat is cloud forest. Habitat loss is a possible threat.