Руины собора Святого Павла в Макао

Remnants of 17th century church in Macau

The Ruins of Saint Paul's (; Ruínas de São Paulo) are the ruins of a 17th century Catholic religious complex in Santo António, Macau, China. They include what was originally St. Paul's College and the Church of St. Paul (Igreja de São Paulo) also known as "Mater Dei", a 17th century Portuguese church dedicated to Saint Paul the Apostle. Today, the ruins are one of Macau's best known landmarks and one of the Seven Wonders of Portuguese Origin in the World. In 2005, they were officially listed as part of the Historic Centre of Macau, a UNESCO World Heritage Site.

Built from 1602 to 1640 by the Jesuits, during the time in which Portugal and Spain were under the same crown, the church was one of the largest Catholic churches in Asia at the time. It was destroyed by a fire during a typhoon on 26January 1835. The façade sits on a small hill, with 68 stone steps leading up to it. The façade is shaped like a retable and themed around the Assumption of Mary.

Resisting calls for the dangerously leaning structure to be demolished, from 1990 to 1995, the ruins were excavated under the auspices of the Instituto Cultural de Macau to study its historic past. The crypt and the foundations were uncovered, revealing the architectural plan of the building. Numerous religious artifacts were also found together with the relics of the Chinese Christian martyrs and the monastic clergy, including the founder of the Jesuit college in Macau, Father Alessandro Valignano. The ruins were restored by the Macanese government into a museum, and the façade is now buttressed with concrete and steel in a way which preserves the aesthetic integrity of the façade. There was once a steel stairway that allowed tourists to climb up to the top of the façade from the rear, but due to concerns for the preservation of the church, tourists are no longer allowed to climb up.