Stanislas Henri Verjus, M.S.C. (1889.05.10 – 1889.12.28), Titular Bishop of Limyra (1889.05.10 – 1892.11.13), later Coadjutor Vicar Apostolic of New Guinea (Papua New Guinea) (1889.12.28 – 1892.11.13)
Louis Couppé, M.S.C. (1889.12.28 – 1890.12.08 see below), Titular Bishop of Lerus (1889.12.28 – 1925.12.18)
Apostolic Vicar of new Pomerania
Louis Couppé, M.S.C. (see above 1890.12.08 – 1922.11.14 see below)
Apostolic Vicars of Rabaul
Louis Couppé, M.S.C. (see below 1922.11.14 – retired 1923), on emeritate promoted as TitularArchbishop of Hierapolis (1925.12.18 – 1926.07.20)
Gerard Vesters (Gerardo Vesters), M.S.C. (1923.02.16 – 1938), Titular Bishop of Diocletianopolis in Palæstina (1923.02.16 – death 1954.08.30); previously Prefect Apostolic of Celebes (Indonesia) (1919.12 – 1923.02.16)
Leo Isidore Scharmach, M.S.C. (1939.06.13 – 1963), Titular Bishop of Mostene (1939.06.13 – 1964.11.26)
Johannes Höhne, M.S.C. (1963.03.01 – 1966.11.15 see below), Titular Bishop of Urima (1963.03.01 – 1966.11.15)
Karl Hesse, M.S.C. (1990.07.07 – 2011.08.11), also President of Bishops’ Conference of Papua New Guinea and Solomon Islands (1994 – 1996), Apostolic Administratorsede plena of Bougainville (Papua New Guinea) (1995 – 1996.09.12), again Apostolic Administrator of Bougainville (1996.09.12 – 1999.04.19), President of Bishops’ Conference of Papua New Guinea and Solomon Islands (2002 – 2005); previously Titular Bishop of Naratcata (1978.04.27 – 1980.10.24) & Auxiliary Bishop of Rabaul (1978.04.27 – 1980.10.24), Bishop of Kavieng (Papua New Guinea) (1980.10.24 – 1990.07.07)
Francesco Panfilo, Salesians (S.D.B.) (2011.08.11 – 2020.06.19), previously Bishop of Alotau–Sideia (Papua New Guinea) (2001.06.25 – 2010.03.18), President of Bishops’ Conference of Papua New Guinea and Solomon Islands (2008.04 – 2011.05), Coadjutor Archbishop of Rabaul (2010.03.18 – 2011.08.11)