The Church of Saint Porphyrius is the Greek Orthodox church of Gaza, standing in the Zaytun Quarter of the Old City and named for the city's fifth-century bishop, whose tomb lies in a side chapel. The current building dates to the twelfth century — making it one of the oldest functioning churches in the world — though it sits on the foundations of a much earlier basilica. The interior is small but rich, with a carved iconostasis and Byzantine icons.
The church served Gaza's small but ancient Christian community, the descendants of believers continuously present in the city since Roman times. It has been a sanctuary in many of Gaza's conflicts. The compound was struck in October 2023 during the Gaza war; the main church survived but a guest hall on the site was destroyed.