Aulus Sempronius Atratinus was a Roman Republican politician of the gens Sempronia during the beginning of the 5th century BC. He served as Consul of Rome in 497 BC and again in 491 BC. He was of the patrician branch of his gens although the Sempronia gens also included certain plebian families. During his first consular appointment, he consecrated the newly built Temple of Saturn in the Roman forum. The aforementioned writers relate the foundation with the festivals of Saturnalia.