Date |  Recent Events |
| 2025.07.16 |  Bishop Bernt Ivar Eidsvig, C.R.S.A., resigned as Bishop of Oslo (Norway)
Bishop Fredrik Hansen succeeded as Bishop of Oslo (Norway) |
| 2025.01.18 | Msgr. Fredrik Hansen was consecrated as Coadjutor Bishop of Oslo (Norway) |
| 2024.11.01 | Msgr. Fredrik Hansen, Priest of Oslo (Norway) and Chaplain of His Holiness, was elected Coadjutor Bishop of Oslo (Norway) |
| 2019.10.01 | Bishop Bernt Ivar Eidsvig, C.R.S.A., resigned as Apostolic Administrator of Trondheim (Norway) |
| 2017.12.23 | Fr. Fredrik Hansen, Priest of Oslo (Norway), was appointed as Chaplain of His Holiness |
| 2012.11.12 | Msgr. Olaf I. Waring was appointed as Prelate of Honour of His Holiness |
| 2012.07.25 | Msgr. Francis Xavier Huynh Tan Hai was appointed as Prelate of Honour of His Holiness |
| 2009.06.08 | Bishop Bernt Ivar Eidsvig, C.R.S.A., Bishop of Oslo (Norway), was appointed as Apostolic Administrator of Trondheim (Norway) |
| 2008.03.20 | Bishop John Willem Nicolaysen Gran, O.C.S.O., Bishop emeritus of Oslo (Norway), passed away at 87 |
| 2007.04.21 | Fr. Fredrik Hansen was appointed as Priest of Oslo (Norway) |
| 2005.10.22 | Fr. Bernt Ivar Eidsvig, C.R.S.A., was consecrated as Bishop of Oslo (Norway) |
| 2005.07.29 | Fr. Bernt Ivar Eidsvig, C.R.S.A., was elected Bishop of Oslo (Norway) Bishop Gerhard Schwenzer, SS.CC., resigned as Bishop of Oslo (Norway) |
| 2005 | Bishop Gerhard Schwenzer, SS.CC., resigned as President of Scandinavian Episcopal Conference |
| 1999 | Bishop Gerhard Schwenzer, SS.CC., Bishop of Oslo (Norway), was appointed as President of Scandinavian Episcopal Conference |
| 1988 | Bishop Gerhard Schwenzer, SS.CC., resigned as Apostolic Administrator of Trondheim (Norway) |
| 1986 | Bishop John Willem Nicolaysen Gran, O.C.S.O., resigned as President of Scandinavian Episcopal Conference |
| 1983.11.26 | Bishop John Willem Nicolaysen Gran, O.C.S.O., resigned as Bishop of Oslo (Norway) Bishop Gerhard Schwenzer, SS.CC., succeeded as Apostolic Administrator of Trondheim (Norway) and Bishop of Oslo (Norway) |
| 1981.06.02 | Bishop Gerhard Schwenzer, SS.CC., Bishop-Prelate of Trondheim (Norway), was appointed as Coadjutor Bishop of Oslo (Norway) |
| 1979.03.28 | Bishop Gerhard Schwenzer, SS.CC., Titular Bishop of Hólar and Vicar Apostolic of Central Norway (Norway), was appointed as Bishop-Prelate of Trondheim (Norway) |
| 1978 | Bishop John Willem Nicolaysen Gran, O.C.S.O., Bishop of Oslo (Norway), was appointed as President of Scandinavian Episcopal Conference |
| 1975.12.07 | Fr. Gerhard Schwenzer, SS.CC., was consecrated as Vicar Apostolic of Central Norway (Norway) and Titular Bishop of Hólar |
| 1975.08.29 | Fr. Gerhard Schwenzer, SS.CC., was elected Titular Bishop of Hólar and Vicar Apostolic of Central Norway (Norway) |
| 1972.06.23 | Bishop Johannes Olav Smit, Vicar Apostolic emeritus of Norway (Norway), passed away at 89 |
| 1972.01.07 | Bishop Jacques Mangers, S.M., Bishop emeritus of Oslo (Norway), passed away at 82 |
| 1964.11.25 | Bishop John Willem Nicolaysen Gran, O.C.S.O., succeeded as Bishop of Oslo (Norway) Bishop Jacques Mangers, S.M., Bishop of Oslo (Norway), was appointed as Titular Bishop of Afufenia |
| 1963.03.24 | Fr. John Willem Nicolaysen Gran, O.C.S.O., was consecrated as Titular Bishop of Raphia and Coadjutor Bishop of Oslo (Norway) |
| 1962.12.27 | Fr. John Willem Nicolaysen Gran, O.C.S.O., was elected Titular Bishop of Raphia and Coadjutor Bishop of Oslo (Norway) |
| 1953.06.29 | Apostolic Vicariate of Oslo was promoted as Diocese of Oslo (without ecclesiastical province) (Norway) Bishop Jacques Mangers, S.M., Titular Bishop of Selja and Vicar Apostolic of Oslo (Norway), was appointed as Bishop of Oslo (Norway) |
| 1933.10.23 | Archbishop Johannes Olaf Fallize, Vicar Apostolic emeritus of Norway and Spitzbergen (Norway), passed away at 88 |
| 1932.08.24 | Fr. Jacques Mangers, S.M., was consecrated as Vicar Apostolic of Oslo (Norway) and Titular Bishop of Selja |
| 1932.07.12 | Fr. Jacques Mangers, S.M., was elected Titular Bishop of Selja and Vicar Apostolic of Oslo (Norway) |
| 1931.04.10 | Apostolic Vicariate of Norway was renamed as Apostolic Vicariate of Oslo (Norway) |
| 1930.10.07 | Bishop Olaf Offerdahl, Vicar Apostolic of Norway (Norway), passed away at 72 |
| 1930.04.06 | Fr. Olaf Offerdahl was consecrated as Vicar Apostolic of Norway (Norway) and Titular Bishop of Selja |
| 1930.03.13 | Fr. Olaf Offerdahl, Apostolic Administrator of Norway (Norway), was elected Titular Bishop of Selja and Vicar Apostolic of Norway (Norway) |
| 1928.10.11 | Fr. Olaf Offerdahl was appointed as Apostolic Administrator of Norway (Norway) Bishop Johannes Olav Smit resigned as Vicar Apostolic of Norway (Norway) |
| 1925.12.15 | Apostolic Vicariate of Norway and Spitzbergen was renamed as Apostolic Vicariate of Norway (Norway) Bishop Johannes Olav Smit, Vicar Apostolic of Norway and Spitzbergen (Norway), was appointed as Vicar Apostolic of Norway (Norway) |
| 1922.10.09 | Bishop Johannes Olaf Fallize, Titular Bishop of Elusa, was promoted as Titular Archbishop of Chalcis |
| 1922.06.29 | Fr. Johannes Olav Smit was consecrated as Vicar Apostolic of Norway and Spitzbergen (Norway) and Titular Bishop of Paralus |
| 1922.04.11 | Bishop Johannes Olaf Fallize resigned as Vicar Apostolic of Norway and Spitzbergen (Norway) Fr. Johannes Olav Smit was elected Vicar Apostolic of Norway and Spitzbergen (Norway) and Titular Bishop of Paralus |
| 1913.06.01 | Apostolic Vicariate of Norway was renamed as Apostolic Vicariate of Norway and Spitzbergen (Norway) Bishop Johannes Olaf Fallize, Vicar Apostolic of Norway (Norway), was appointed as Vicar Apostolic of Norway and Spitzbergen (Norway) |
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