The Diocese of Candon is a Roman Catholic diocese located in the province of Ilocos Sur, Philippines. Established on June 29, 1974, it serves as a spiritual and administrative region for the Catholic Church, overseeing various parishes and communities within its jurisdiction. The diocese is part of the ecclesiastical province of Laoag. The diocese's seat is the Cathedral of St. John the Evangelist, which is situated in the city of Candon. It is led by a bishop who is responsible for guiding the local church and its activities, including religious services, education, and community outreach programs.