Faustin de Lyon was a 3rd-century prelate who served as the fifth bishop of Lyon. During his tenure, he acted as a representative for Gallic bishops, specifically addressing ecclesiastical disputes. He is notably recorded for communicating with Pope Stephen I and Cyprian, the Bishop of Carthage, regarding the treatment of Christians who sought to return to the faith following the Decian persecution. His involvement highlighted the tensions surrounding the refusal of certain leaders to welcome repentant believers back into the community.