St George Orthodox Church, Chathannoor, known locally as Chathannoor Valiya Palli, is a parish of the Thiruvananthapuram (Trivandrum) Diocese of the Malankara Orthodox Syrian Church. "Chathannoor Marthamariyam Suriyani Pally," as it was called in the ancient days, was built around AD 1755. One of the largest churches in South Kerala, it is the oldest church in Chathannoor and mother church to the churches in the Chathannoor region.