Theodosius of Alexandria may refer to: Theodosius of Alexandria (grammarian) (c. 3rd century CE), author of a work on inflection of Greek nouns and verbs Patriarch Theodosius I of Alexandria (died 567) Pope Theodosius II of Alexandria (fl. 730–742) Patriarch Theodosius II of Alexandria (fl. 12th century) Pope Theodosius III of Alexandria (fl. 1293–1300)