Saint Maximus of Jerusalem (Maximus III of Jerusalem) was an early Christian saint and bishop of Jerusalem from roughly 333 AD to his death in 347 AD. He was the third bishop of Jerusalem named Maximus, the other two being in the latter half of the 2nd century.
During one of the persecutions of his era he was tortured for his Christian faith, and thus became known as a confessor, although modern sources disagree as to whether this happened in the reign of Galerius Maximianus or the reign co-emperors Diocletian and Maximian. He was a priest in Jerusalem, and it is said by Sozomen that he was so popular among the people for good character and for being a confessor that when Saint Macarius attempted to appoint him as bishop of Lydda (also known as Diospolis) the populace insisted upon his retention in Jerusalem. Upon Macarius' death Maximus became bishop of Jerusalem, and was present in 335 at the first synod of Tyre, and signed that council's condemnation of Athanasius. During Athanasius' return from exile, circa 346, Maximus convoked a synod in Jerusalem of sixteen Palestinian bishops that welcomed Athanasius. Socrates Scholasticus recorded that Maximus "restored communion and rank" to Athanasius, Athanasius receiving support against the Arians and Maximus advancing the desire of the bishops of Jerusalem to have their see be equal in status to the metropolitan see of Caesarea, a desire later achieved in 451 AD.