| Jurisdiction: | Diocese |
| Border: | Catholic |
| Thanh Hóa | |
| Latin: | Dioecesis de Thanh Hoa |
| Local: | Giáo phận Thanh Hóa |
| Coat: | Coat of arms of Joseph Nguyễn Đức Cường.svg |
| Coat Size: | 200px |
| Coat Caption: | The coat of arms of Bishop Cường |
| Province: | Hà Nội |
| Area Km2: | 11,700[1] |
| Population: | 4,164,140 |
| Population As Of: | 2022 |
| Catholics: | 159,797[2] |
| Catholics Percent: | 3.8 |
| Parishes: | 99[3] |
| Denomination: | Catholic |
| Sui Iuris Church: | Latin Church |
| Rite: | Roman Rite |
| Established: |
|
| Cathedral: | Saint Anne Cathedral |
| Patron: | Saint Joseph |
| Bishop: | Joseph Nguyễn Đức Cường |
| Metro Archbishop: | Joseph Vũ Văn Thiên |
| Suffragan: | for one --> |
| Archdeacon: | for one--> |
The Diocese of Thanh Hóa (Latin: Dioecesis de Thanh Hoa) 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.
Saint Anne Cathedral in Thanh Hoa city has been assigned as the Cathedral of the diocese.[4]
| Bishop | Coat of Arms | Period in office | Status | Reference | ||
|---|---|---|---|---|---|---|
| 1 | Bishop Louis-Christian-Marie de Cooman, M.E.P. | June 21, 1932 – December 05, 1960 | Resigned | [5] | ||
| 2 | Bishop Pierre Phạm Tần | December 05, 1960 – February 01, 1990 | Died in office | |||
| 3 | Bishop Barthélémy Nguyễn Sơn Lâm, P.S.S. | March 23, 1994 – October 09, 2003 | ||||
| 4 | Bishop Joseph Nguyễn Chí Linh | May 21, 2004 – October 29, 2016 | Transferred to Huê. | |||
| – | Archbishop Joseph Nguyễn Chí Linh | October 29, 2016 – April 25, 2018 | Apostolic Administrator | |||
| 5 | Bishop Joseph Nguyễn Đức Cường | April 25, 2018–present | Current bishop | |||