Pope Stephen V (Latin: Stephanus V) was Pope from September 885 to his death in 891. He succeeded Pope Adrian III, and was in turn succeeded by Pope Formosus. In his dealings with Constantinople in the matter of Photius, as also in his relations with the young Slavic Orthodox church, he pursued the policy of Pope Nicholas I.
His father Hadrian, who belonged to the Roman aristocracy, entrusted his education to his relative, Bishop Zachary, librarian of the Holy See. Stephen was created cardinal-priest of Santi Quattro Coronati by Marinus I, and his obvious holiness was the cause of his being chosen pope.
He was consecrated in September 885 without waiting for the imperial confirmation; but when Charles the Fat found with what unanimity he had been elected he let the matter rest.