San Diego de Alcala Parish Church, colloquially known as Polo Church, is a Roman Catholic church in Valenzuela, located about 15.5 kilometers (9.6 mi) north of Manila in the Philippines. It is under the jurisdiction of the Diocese of Malolos. The original church was the oldest church in the city of Valenzuela, built by Father Juan Taranco and finished by Father Jose Valencia in 1632. Destroyed during World War II, its surviving belfry is the oldest in the city.