The Valentinian Dynasty or Valentinianic Dynasty, consisting of four emperors, rules the Western Roman Empire from 364 to 392 and the Eastern Roman Empire from 364 to 378.The dynasty is related to the House of Theodosius by the marriage of Theodosius I of the East (379-395) to Valentinian I's daughter.

From this marriage comes Galla Placidia, whose son Valentinian III becomes the western emperor (425-455), the last ruler descended from either dynasty.

His descendants continue to be a part of the Roman nobility in Constantinople until the end of the sixth century.