Stephen Porphyrogometus (d. 893) was the Patriarch of Constantinople from 886-893. He was an adopted son of Byzantine Emperor Basil I and the youngest brother of Emperor Leo VI. Both Leo and Stephen were actually the sons of Michael III, whose widow Basil had married. Basil had Stephen castrated, and Stephen became Patriarch when Photius I was dismissed upon the succession of Leo VI.

See also: Eastern Orthodoxy