Yohannan V Bar Isa was Patriarch of the Church of the East from 1000 to 1011. Brief accounts of Yohannan's patriarchate are given in the Ecclesiastical Chronicle of the Jacobite writer Bar Hebraeus (fl. 1280) and in the ecclesiastical histories of the Nestorian writers Mari ibn Suleiman (twelfth-century), ʿAmr ibn Mattā (fourteenth-century) and Ṣalībā ibn Yūḥannā (fourteenth-century).