Rupela leucatea is a moth in the Crambidae family. It was described by Zeller in 1863. It is found in Puerto Rico, Jamaica, Cuba, Hispaniola, Martinique, Antigua, Mexico, Guatemala, Nicaragua, Panama, Honduras, Trinidad, Venezuela, the Guianas, Brazil, Argentina, Paraguay and Peru. The wingspan is 22–38 mm for males and 25–53 mm for females. The wings are shining white. The larvae feed on Echinochloa polystachya.