Saint Mary Church of the Holy Belt (Arabic: كنيسة أم الزنار‎; Um az-Zinnar) is a historical Syriac Orthodox Church in Homs, Syria. The church is built over an underground church dating back to 50 AD. It is the seat of the Syriac Orthodox archbishopric. The church contains a venerated relic that is supposed to be a section of the belt of Mary mother of Jesus. This is the Syriac church's equivalent of the Cincture of the Theotokos of the Greek Orthodox Church, now in Vatopedi Monastery, Mount Athos, and the Catholic Girdle of Thomas in Prato Cathedral in Italy.