Nullotitan ("Nullo's giant") is a genus of titanosaur from the Late Cretaceous Chorrillo Formation in the Santa Cruz Province of Argentina. Its name comes from the paleontologist Francisco Nullo, who initially found the animal's remains. It lived with the Hypsilophodont Isasicursor which was described in the same paper and the Megaraptoran Maip which may have preyed upon it.