The Diocese of Qui Nhơn (also written as the Diocese of Quy Nhơn; ; ) is a Catholic diocese in central Vietnam. The Bishop is Matthieu Nguyễn Văn Khôi, previously rector of Assumption Cathedral in Quy Nhơn and professor at the Stella Maris Major Seminary of Nha Trang, was appointed Coadjutor Bishop of the diocese by Pope Benedict XVI on December 31, 2009. The creation of the diocese in present form was declared on 24 November 1960.

The diocese covers an area of 16,200 km², and is a suffragan diocese of the Archdiocese of Huế.

By 2004, the diocese of Qui Nhơn had about 62,520 Catholics (1.7% of the population), 70 priests and 36 parishes.Catholic Hierarchy: "Diocese of Quy Nhon" retrieved November 8, 2015

Assumption Cathedral in Quy Nhơn town has been assigned as the cathedral of the diocese.GCatholic.org

Ordinaries

Vicariate Apostolic of Cochin (1658-1844) Vicar ApostolicPeriod in officeStatusReference1 Bishop Pierre Lambert de la Motte, M.E.P.July 29, 1658 – June 15, 1679Died in office 2 Bishop Guillaume Mahot, M.E.P.January 29, 1680 – June 04, 18643 Bishop Joseph Duchesnes1864 – June 17, 18644 Bishop François PerezFebruary 05, 1687 – September 20, 17285 Bishop Alexandre de Alexandris, B.September 20, 1728 – September 13, 17386 Bishop Valère Rist, O.F.M.1737 – April 13, 17437 Bishop Arnaud-François Lefèbvre, M.E.P.October 06, 1741 – March 27, 17608 Bishop Guillaume Piguel, M.E.P.July 29, 1762 – June 21, 17719 Bishop Pierre-Joseph-Georges Pigneau de Béhaine, M.E.P.September 24, 1771 – October 09, 179910 Bishop Jean Labartette, M.E.P.October 09, 1799 – August 06, 182311 Bishop Jean-Louis Taberd, M.E.P.September 18, 1827 – July 31, 184012 Bishop Étienne-Théodore Cuenot, M.E.P.July 31, 1840 – March 02, 1844Remained as Vicar apostolic of Eastern Cochin.

Coadjutor Vicar Apostolic of Cochin Vicar ApostolicPeriod in officeReference1 Bishop Charles-Marin Labbé, M.E.P.January 15, 1697 – March 24, 17232 Bishop Alexandre de Alexandris, B. December 22, 1725 – September 20, 17283 Bishop Valerian Rist, O.F.M. October 03, 1735 – September 15, 17374 Bishop Edmond Bennetat, M.E.P. September 22, 1745 – July 16, 17585 Bishop Jean Labartette, M.E.P. March 30, 1784 – October 09, 17996 Bishop Jean-André Doussain, M.E.P. July 23, 1798 – December 14, 18097 Bishop Pierre-Marie Le Labousse, M.E.P. 1801 – May 28, 18018 Bishop Jean-Joseph Audemard 1817 – August 08, 18219Bishop Étienne-Théodore Cuenot, M.E.P. September 09, 1831 – July 31, 184010 Bishop Dominique Lefèbvre, M.E.P. December 10, 1839 – March 02, 1844

Vicariate Apostolic of Eastern Cochin (1844-1924) Vicar ApostolicPeriod in officeStatusReference13Bishop Étienne-Théodore Cuenot, M.E.P. March 02, 1844 – November 14, 1861Died in office, Martyred.14 Bishop Eugène-Étienne Charbonnier, M.E.P. September 09, 1864 – August 07, 1878Died in office15 Bishop Louis-Marie Galibert, M.E.P. May 23, 1879 – April 24, 188316 Bishop Désiré-François-Xavier Van Camelbeke, M.E.P. January 15, 1884 – November 09, 190117 Bishop Damien Grangeon, M.E.P. June 09, 1902 – December 03, 1924Remained as Vicar apostolic of Quinhon.

Coadjutor Vicar Apostolic of Eastern Cochin (1844-1921) Vicar ApostolicPeriod in officeReference11Bishop François-Marie-Henri-Agathon Pellerin, M.E.P.March 11, 1844 – August 27, 185012Bishop Constant Philomen Jeanningros, M.E.P.August 24, 1911 – March 21, 1921

Vicariate Apostolic of Quinhon (1924-1957) Vicar ApostolicPeriod in officeStatusReference18Bishop Damien Grangeon, M.E.P.December 03, 1924 – March 03, 1929Resigned19Bishop Augustin-Marie Tardieu, M.E.P.December 19, 1929 – December 12, 1942Died in office20Bishop Paul-Raymond-Marie-Marcel Piquet, M.E.P.November 11, 1943 – July 05, 1957Transferred to Nha Trang.

Diocese of Qui Nhon (1960-present) BishopCoat of ArmsPeriod in officeStatusReference1 Bishop Pierre-Marie Phạm Ngọc Chi November 24, 1960 – January 18, 1963Transferred to Da Nang.2 Bishop Dominique Hoàng Văn Ðoàn, O.P. January 18, 1963 – May 20, 1974Died in office3 Bishop Paul Huỳnh Ðông Các July 01, 1974 – June 03, 1999Resigned4 Bishop Pierre Nguyễn Soạn June 03, 1999 – June 30, 20125 Bishop Matthieu Nguyễn Văn Khôi June 30, 2012 – presentIncumbent

Coadjutor Bishops of Qui Nhon (1976-2012) Coadjutor BishopCoat of ArmsPeriod in officeReference1 Bishop Joseph Phan Văn Hoa March 30, 1976 – October 06, 19872 Bishop Matthieu Nguyễn Văn Khôi December 31, 2009 – June 30, 20123 Bishop-elect Jean-Baptiste Nguyễn Quốc Hưng April 11, 2026 - present

References