 | 1908 | 1909 | 1910 |  |
Date | Country | Change |
| 1909 |  Chile | Apostolic Prefecture of Patagonia Meridional, Tierra del Fuego e Islas Malvinas lost territory to Metropolitan Archdiocese of Buenos Aires |
| 1909 |  Israel | Titular Archiepiscopal See of Ptolemais was restored |
| 1909 |  Libya | Titular Archiepiscopal See of Ptolemais antea Syis was established |
| 1909 |  Turkiye | Titular Episcopal See of Sasima was restored |
| 1909.02.18 |  Lesotho | Apostolic Prefecture of Basutoland was promoted as Apostolic Vicariate of Basutoland |
| 1909.05.08 |  Central African Republic | Apostolic Prefecture of Oubangui Chari was established (from Apostolic Vicariate of Haut-Congo français) |
| 1909.07.07 |  Namibia | Apostolic Prefecture of Great Namaqualand was established (from Apostolic Vicariate of Orange River) |
| 1909.07.12 |  Kenya | Mission sui juris of Kenya was promoted as Apostolic Vicariate of Kenya |
| 1909.09.17 |  Egypt | Apostolic Prefecture of Delta del Nilo was promoted as Apostolic Vicariate of Delta del Nilo |
| 1909.12.29 |  Brazil | Diocese of Natal was established (from Diocese of Paraíba and became suffragan of São Salvador da Bahia) |
| 1909.12.31 |  USA | Diocese of Bismarck was established (from Diocese of Fargo and became suffragan of Saint Paul) |
| 1909.12.31 | USA | Diocese of Crookston was established (from Metropolitan Archdiocese of Saint Paul and became suffragan of Saint Paul) |
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