Isho'yahb may refer to:
Isho'yahb I (fl. 581-596), patriarch Yeshuyab II (fl. 620-644), also Isho'yahb II of Gdala (628-45), Christian patriarch Ishoyahb III, (fl. 649-659), patriarch Isho'yahb IV (fl. 1020-1025) Isho'yahb V (fl. 1148-1176) Mar Eliyya XIII Isho-Yab (fl. 1778-1804)
Bishops in Adiabene (East Syrian Ecclesiastical Province) Ishoy'yahb of Shenna, contemporary of Isho'yahb II of Gdala Ishoʿyahb of Haditha, metropolitan of Mosul during the reign of the patriarch Mari (987–99)
See also List of patriarchs of the Church of the East