Physalaemus nanus is a species of frog in the family Leptodactylidae. It is endemic to Brazil. Its natural habitats are subtropical or tropical moist lowland forests, intermittent freshwater marshes, rural gardens, heavily degraded former forest, irrigated land, seasonally flooded agricultural land, and canals and ditches. It is threatened by habitat loss. References nanus Endemic fauna of Brazil Taxonomy articles created by Polbot Amphibians described in 1888