Shimun Yahballaha, also designated in some modern historiographical works as Yahballaha IV, or even Yahballaha V, was Patriarch of the pro-Catholic line of primates of the Church of the East, from c. 1572 to c. 1580. In primary sources, he is mentioned as patriarch Shimun by several inscriptions dated from 1572 to 1577, while his additional name Yahballaha is recorded in a later report, submitted to Rome (1581) by metropolitan Eliya. The same report describes recently deceased patriarch Yahballaha Shimun as an elderly hierarch, who was elected to the patriarchal see sometime after the death of Abdisho IV Maron (d. 1570), but did not seek confirmation from Rome, due to his advanced age.