The diocese of Bac Ninh (Latin: Dioecesis Bacninhensis) is a Roman Catholic diocese of Vietnam.

The creation of the diocese in present form was declared November 24, 1960.

The diocese covers an area of 12,227 km², and is a suffragan diocese of the Archdiocese of Hanoi.

By 2004, the diocese of Bac Ninh had about 123,090 believers (1.8% of the population), 23 priests and 47 parishes.

Queen of the Rosary Cathedral in Bac Ninh has been assigned as the Cathedral of the diocese.

Vicar apostolic		Period in office	Status	Reference
1	Bishop Antonio Colomer, O.P.	June 01, 1883 – February 07, 1902	Died in office
2	Bishop Maximino Velasco, O.P.	February 07, 1902 – December 03, 1924	Remained as Vicar apostolic of Bac Ninh

Vicar apostolic		Period in office	Status	Reference
2	Bishop Maximino Velasco, O.P.	December 03, 1924 – July 09, 1925	Died in office
3	Bishop Teodoro Gordaliza Sánchez, O.P.	July 09, 1925 – October 14, 1931
4	Bishop Eugenio Artaraz Emaldi, O.P.	June 14, 1932 – December 19, 1947
5	Bishop Dominique Hoàng Văn Ðoàn, O.P.	March 12, 1950 – 1955	Transferred to Quy Nhon.
–	Bishop Joseph-Marie-Pierre Khuất Văn Tạo	1955 – April 05, 1963	Apostolic Administrator

Bishop			Coat of Arms	Period in office	Status	reference
1		Bishop Paul-Joseph Phạm Ðình Tụng		April 05, 1963 – March 23, 1994	Transferred to Hanoi
2		Bishop Joseph-Marie Nguyễn Quang Tuyến		March 23, 1994 – September 24, 2006	Died in office
3		Bishop Cosme Hoàng Văn Ðạt, S.J.		August 04, 2008 – June 17, 2023	Resigned
4		Bishop Joseph Đỗ Quang Khang		June 17, 2023 – present	Current bishop

Coadjutor Vicar Apostolic of Northern Tonking (1889-1924)

Coadjutor Vicar Apostolic		Period in office	Reference
1	Bishop Maximino Velasco, O.P.	July 28, 1889 – February 07, 1902
2	Bishop Teodoro Gordaliza Sánchez, O.P.	August 10, 1915 – December 03, 1924

Coadjutor Vicar Apostolic of Bac Ninh (1924-1925)

Coadjutor Vicar Apostolic		Period in office	Reference
2	Bishop Teodoro Gordaliza Sánchez, O.P.	December 03, 1924 – July 07, 1925

Coadjutor Bishops of Bac Ninh (1988-2023)

Coadjutor Bishop			Coat of Arms	Period in office	Reference
1		Bishop Joseph-Marie Nguyễn Quang Tuyến		December 15, 1988 – March 23, 1994
2		Bishop Joseph Đỗ Quang Khang		October 30, 2021 – June 17, 2023

21°10′48″N 106°03′43″E / 21.1801°N 106.0620°E / 21.1801; 106.0620