The Diocese of Thanh Hóa () is a Roman Catholic diocese of Vietnam. The bishop since 2018 is Joseph Nguyễn Đức Cường. Of the three million persons living in its area about 3% are Roman Catholics. The diocese covers an area of 11,168 km², and is a suffragan diocese of the Archdiocese of Hà Nôi. It was erected on May 7, 1932 as a Vicariate Apostolic. On November 24, 1960 it was elevated to a diocese. Immaculate Conception Cathedral in Thanh Hoa city has been assigned as the Cathedral of the diocese. References External links catholic-hierarchy.org Thanh Hóa Thanh Hoa Christian organizations established in 1932 Roman Catholic dioceses and prelatures established in the 20th century Thanh Hoa, Roman Catholic Diocese of 1932 establishments in Vietnam