 | 1845 | 1846 | 1847 |  |
Date | Country | Change |
| 1846 |  Bosnia and Herzegovina | Apostolic Vicariate of Hercegovine was restored (from Diocese of Dubrovnik and Apostolic Vicariate of Bosnia) |
| 1846 |  Italy | Diocese of Agrigento lost territory to Metropolitan Archdiocese of Palermo |
| 1846.03.27 |  China | Apostolic Vicariate of Chekiang and Kiangsi 浙江江西 was renamed as Apostolic Vicariate of Chekiang 浙江 (lost territory to establish Apostolic Vicariate of Kiangxi 江西) |
| 1846.03.27 | China | Apostolic Vicariate of Guizhou 貴州 was restored (from Apostolic Vicariate of Szechwan 四川) |
| 1846.03.27 | China | Apostolic Vicariate of Kiangxi 江西 was restored (from Apostolic Vicariate of Chekiang and Kiangsi 浙江江西) |
| 1846.03.27 | China | Apostolic Vicariate of Lhassa 拉薩 was established (from Apostolic Vicariate of Tibet-Hindustan) |
| 1846.03.27 |  India | Apostolic Vicariate of Tibet-Hindustan was renamed as Apostolic Vicariate of Agra (lost territory to establish Apostolic Vicariate of Lhassa 拉薩) |
| 1846.03.27 |  Vietnam | Apostolic Vicariate of Southern Tonking was established (from Apostolic Vicariate of Western Tonking) |
| 1846.04.03 |  Sudan | Apostolic Vicariate of Central Africa was established (from Apostolic Vicariate of Egypt and Arabia) |
| 1846.04.30 | Italy | Diocese of Udine lost territory to Diocese of Belluno |
| 1846.05.01 |  Japan | Apostolic Vicariate of Japan 日本 was established (from Apostolic Vicariate of Korea 조선) |
| 1846.05.04 |  Ethiopia | Apostolic Vicariate of Galla was established (from Apostolic Prefecture of Abyssinia) |
| 1846.05.19 | India | Apostolic Prefecture of Madura was promoted as Apostolic Vicariate of Madura and Coromandel Coast |
| 1846.07.24 |  Canada | Diocese of Vancouver Island was established (from Apostolic Vicariate of Oregon and became suffragan of Oregon City) |
| 1846.07.24 |  USA | Apostolic Vicariate of Oregon was promoted as Metropolitan Archdiocese of Oregon City (with suffragan sees Vancouver Island and Walla Walla and lost territory to establish Diocese of Vancouver Island and Diocese of Walla Walla) |
| 1846.07.24 | USA | Diocese of Walla Walla was established (from Apostolic Vicariate of Oregon and became suffragan of Oregon City) |
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