; Apostolic Prefects of Two Guineas and Senegambia •
Edward Barron (1842.10.03 – 1844.09.03),
Titular Bishop of
Constantina (1842.10.03 – 1844.03.02), emeritus as Titular Bishop of
Eucarpia (1844.03.02 – death 1854.09.12) • Fr.
Eugène Tisserant 1844 – death 1846, ; Apostolic Vicars of Two Guineas and Senegambia •
Jean-Benoît Truffet,
C.S.Sp. 1846.09.22 – death 1847.11.23,
Titular Bishop of Callipolis (1846.09.22 – 1847.11.23) •
Jean René Bessieux, C.S.Sp. (1848.06.20 – death 1863.02.06),
Titular Bishop of Callipolis (1848.06.20 – 1876.04.30) ; Apostolic Vicar of Two Guineas •
Jean-René Bessieux, C.S.Sp. (1863.02.06 – death 1876.04.30) ; Apostolic Vicars of Gabon •
Pierre-Marie Le Berre, C.S.Sp. 1877.09.07 – 1891.07.16, Titular Bishop of
Arca in Phoenicia (1877.09.07 – 1891.07.16) •
Alexandre-Louis-Victor-Aimé Le Roy, C.S.Sp. 1892.07.03 – 1896.05.24, Titular Bishop of
Alinda (1892.07.03 – 1921.05.13); later
superior general of the
Congregation of the Holy Spirit (1896.07 – 1926), retired as
Titular Archbishop of
Caria (see) (1921.05.13 – 1938.04.21) •
Jean Martin Adam, C.S.Sp. 1897.02.16 – 1914.05.07, Titular Bishop of
Thmuis (1897.02.16 – death 1929.01.14) •
Louis Jean Martrou, C.S.Sp. 1914.05.07 – death 1925.03.22, succeeding as former
Coadjutor Vicar Apostolic of Gabon (Gabon) (1912.12.10 – 1914.05.07) & Titular Bishop of
Corycus (1912.12.10 – 1925.03.22) •
Louis-Michel-François Tardy, C.S.Sp. 1926.01.04 – death 1947.01.28, Titular Bishop of
Acalissus (1925.12.18 – 1947.01.28) ; Apostolic Vicar of Libreville • Jean-Jerôme Adam, C.S.Sp. (1947.07.10 – 1955.09.14
see below), Titular Bishop of
Rhinocorura (1947.07.10 – 1955.09.14) ; Bishop of Libreville • Jean-Jerôme Adam, C.S.Sp. (1955.09.14 – 1958.12.11) ; Metropolitan Archbishops of Libreville •
Jean-Jerôme Adam,
C.S.Sp. (1958.12.11 – 1969.05.29), emeritus as
Titular Archbishop of
Brescello (1969.05.29 – 1976.10.27) •
André Fernand Anguilé (1969.05.29 – retired 1998.04.03), also President of Episcopal Conference of Gabon (1970 – 1981) •
Basile Mvé Engone,
S.D.B. (3 April 1998 – 12 March 2020); - present), previously bishop of Franceville
Coadjutor Vicars Apostolic •
Aloys Kobès (1848–1863), did not succeed to see; appointed apostolic vicar of Senegambia, Senegal •
Louis Jean Martrou, C.S.Sp. (1912–1914)
Auxiliary Bishops •
Mathieu Madega Lebouankehan (2000–2003), appointed bishop of Port-Gentil on 19 March 2003 •
François Ndong (1960–1969), appointed Bishop of Oyem
Other priests of this diocese who became bishops •
Jean-Patrick Iba-Ba, appointed bishop of Franceville on 4 November 2017; later returned to Libreville as archbishop •
Euzébius Chinekezy Ogbonna Managwu, appointed bishop of Port-Gentil on 12 January 2016 == Province ==