Ursus of Auxerre was a 5th-century presbyter who served as the Bishop of Auxerre. Born around 450, he previously lived as a hermit at Saint Amator. He was elected to the bishopric at the age of 75, beginning his leadership around 502. During his tenure, he is credited with saving his town through the power of prayer. He died in Auxerre in 508 at the age of 81.