Diogène d'Arras was a Greek prelate who served as a bishop in Gaul during the late fourth century. According to tradition, he was sent to the region by Pope Siricius and later consecrated by Nicaise of Reims. He is recognized as a martyr, having been killed by the Vandals during the fifth century. His life and ministry are associated with the early Christianization of the area around Arras.