 | 1904 | 1905 | 1906 |  |
Date | Country | Change |
| 1905 |  Morocco | Titular Episcopal See of Marocco was suppressed |
| 1905 |  Turkiye | Titular Metropolitan See of Pessinus (Armenian Rite) was established |
| 1905.01.02 |  Cameroon | Apostolic Prefecture of Cameroun was promoted as Apostolic Vicariate of Cameroun |
| 1905.01.17 |  Colombia | Apostolic Vicariate of Goajira was established (from Diocese of Santa Marta) |
| 1905.02.11 |  Indonesia | Apostolic Prefecture of Dutch Borneo was established (from Apostolic Vicariate of Batavia) |
| 1905.04.28 |  China | Apostolic Vicariate of Gansu 甘肅 was renamed as Apostolic Vicariate of Northern Kansu 甘肅北境 (lost territory to establish Apostolic Vicariate of Southern Kansu 甘肅南境) |
| 1905.04.28 | China | Apostolic Vicariate of Southern Kansu 甘肅南境 was established (from Apostolic Vicariate of Gansu 甘肅) |
| 1905.05.03 |  USA | Diocese of Superior was established (from Diocese of Green Bay and Diocese of La Crosse and became suffragan of Milwaukee) |
| 1905.08.23 | USA | Apostolic Vicariate of Indian Territory was promoted as Diocese of Oklahoma (became suffragan of New Orleans) |
| 1905.09.12 |  Canada | Apostolic Prefecture of Golfe Saint-Laurent was promoted as Apostolic Vicariate of Golfe Saint-Laurent |
| 1905.09.14 |  Kenya | Mission sui juris of Kenya was established (from Apostolic Vicariate of Northern Zanguebar) |
| 1905.09.16 |  Marshall Islands | Mission sui juris of Marshall Islands was established (from Apostolic Vicariate of New Pomerania) |
| 1905.12.19 |  Micronesia,  Palau | Apostolic Prefecture of Caroline Islands was established (from the suppressed Mission sui juris of Eastern Carolines and Mission sui juris of Western Carolines) |
| 1905.12.19 | Micronesia | Mission sui juris of Eastern Carolines was suppressed (to establish Apostolic Prefecture of Caroline Islands) |
| 1905.12.19 | Micronesia | Mission sui juris of Western Carolines was suppressed (to establish Apostolic Prefecture of Caroline Islands) |
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