 | 1844 | 1845 | 1846 |  |
Date | Country | Change |
| 1845.02.07 |  India | Apostolic Vicariate of Patna was established (from Apostolic Vicariate of Tibet-Hindustan) |
| 1845.02.17 |  Sri Lanka,  Maldives | Apostolic Vicariate of Ceylon was renamed as Apostolic Vicariate of Colombo (lost territory to establish Apostolic Vicariate of Jaffna) |
| 1845.02.17 | Sri Lanka | Apostolic Vicariate of Jaffna was established (from Apostolic Vicariate of Ceylon) |
| 1845.03.13 |  Turkiye | Apostolic Prefecture of Trabzon was established |
| 1845.03.16 | India | Apostolic Pro-Vicariate of Mysore was established (from Apostolic Vicariate of Pondicherry) |
| 1845.03.16 | India | Apostolic Pro-Vicariate of Vizagapatam was established (from Apostolic Vicariate of Madras and Apostolic Vicariate of Pondicherry) |
| 1845.04.03 | India | Apostolic Pro-Vicariate of Coimbatore was established (from Apostolic Vicariate of Pondicherry) |
| 1845.05.06 |  Australia | Apostolic Vicariate of Essington was established (from Metropolitan Archdiocese of Sydney and became suffragan of Sydney) |
| 1845.05.06 | Australia | Apostolic Vicariate of King George Sounde - The Sound was established (from Metropolitan Archdiocese of Sydney and Diocese of Adelaide and became suffragan of Sydney) |
| 1845.05.06 | Australia,  Christmas Island,  Cocos Islands,  Heard Island and McDonald Islands | Diocese of Perth was established (from Metropolitan Archdiocese of Sydney and became suffragan of Sydney) |
| 1845.05.12 | India | Apostolic Pro-Vicariate of Mangalore was restored (from Apostolic Vicariate of Verapoly) |
| 1845.05.12 | India | Apostolic Vicariate of Quilon was restored (from Apostolic Vicariate of Verapoly) |
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