Ulua may refer to: Ulúa River San Juan de Ulúa, a complex located on an island of the same name in the Gulf of Mexico USS Ulua (SS-428), a submarine of the United States Navy Ulua (fish), a genus of fishes in the family Carangidae vernacular name of the species giant trevally (Caranx ignobilis), but not in genus Ulua proper Ulua people, an indigenous people of El Salvador and Nicaragua.