The Greek Orthodox patriarch of Jerusalem or Eastern Orthodox patriarch of Jerusalem, officially patriarch of Jerusalem, is the head bishop of the Greek Orthodox Patriarchate of Jerusalem, ranking fourth of nine patriarchs in the Eastern Orthodox Church. Since 2005, the Eastern Orthodox patriarch of Jerusalem has been Theophilos III. The patriarch is styled "Patriarch of the Holy City of Jerusalem and all Holy Land, Syria, beyond the Jordan River, Cana of Galilee, and Holy Zion." The patriarch is the head of the Brotherhood of the Holy Sepulchre, and the religious leader of about 130,000 Eastern Orthodox Christians in the Holy Land, most of them Palestinian Christians in Israel and Palestine.

A bishop is an ordained member of the clergy who is entrusted with a position of authority and oversight in a religious institution. In Christianity, bishops are normally responsible for the governance and administration of dioceses. The role or office of the bishop is called episcopacy. Organizationally, several Christian denominations utilize ecclesiastical structures that call for the position of bishops, while other denominations have dispensed with this office, seeing it as a symbol of power. Bishops have also exercised political authority within their dioceses.