Leptodactylus longirostris is a species of frog in the Leptodactylidae family. Its local name is sapito silbador carilargo ("long-faced whistling toadlet"). It is found in Brazil, Colombia, French Guiana, Guyana, Suriname, and Venezuela. Its natural habitats are subtropical or tropical moist lowland forests, subtropical or tropical seasonally wet or flooded lowland grassland, rivers, freshwater marshes, intermittent freshwater marshes, pastureland, and rural gardens. It is not considered threatened by the IUCN.