 | 1847 | 1848 | 1849 |  |
Date | Country | Change |
| 1848 |  Italy | Diocese of Albano lost territory to Diocese of Frascati |
| 1848.01.13 |  Ecuador | Diocese of Quito was promoted as Metropolitan Archdiocese of Quito (with suffragan sees Cuenca and Guayaquil) |
| 1848.01.21 |  Madagascar | Apostolic Prefecture of Madagascar was promoted as Apostolic Vicariate of Madagascar |
| 1848.05.07 |  Brazil | Diocese of São Pedro do Rio Grande was established (from Diocese of São Sebastião do Rio de Janeiro and became suffragan of São Salvador da Bahia) |
| 1848.05.09 |  French Polynesia | Apostolic Vicariate of Marquesas Islands was established (from Apostolic Vicariate of Eastern Oceania) |
| 1848.05.09 | French Polynesia,  Pitcairn Islands | Apostolic Vicariate of Eastern Oceania was renamed as Apostolic Vicariate of Tahiti Islands (lost territory to establish Apostolic Vicariate of Marquesas Islands) |
| 1848.05.10 |  China | Apostolic Vicariate of Guangdong-Guangxi 兩廣 was established (from Diocese of Macau 澳門) |
| 1848.06.20 |  New Zealand | Apostolic Vicariate of New Zealand was promoted as Diocese of Auckland (lost territory to establish Diocese of Wellington) |
| 1848.06.20 | New Zealand | Diocese of Wellington was established (from Apostolic Vicariate of New Zealand and without ecclesiastical province) |
| 1848.07.03 |  Lithuania | Diocese of Vilnius lost territory to Diocese of Žemaitija |
| 1848.07.03 |  Moldova,  Russia | Diocese of Cherson was established (from Metropolitan Archdiocese of Mohilev and became suffragan of Mohilev) |
| 1848.07.03 |  Sweden | Apostolic Vicariate of Sweden lost territory to Metropolitan Archdiocese of Mohilev |
| 1848.08.17 | Italy | Territorial Prelature of Acquaviva delle Fonti was restored (from Metropolitan Archdiocese of Bari e Canosa and without ecclesiastical province) |
| 1848.08.17 | Italy | Archpresbyterate nullius of Altamura was promoted as Territorial Prelature of Altamura (without ecclesiastical province) |
| 1848.08.19 |  Iraq | Diocese of Baghdad was promoted as Archdiocese of Baghdad |
| 1848.09 | China | Apostolic Vicariate of Kokonur 青海湖 was established |
| 1848.09.04 | Madagascar | Apostolic Prefecture of Isole di Mayotta, Nossi-Bé e Comore was established (from Apostolic Vicariate of Madagascar) |
| 1848.09.05 |  Vietnam | Apostolic Vicariate of Central Tonking was established (from Apostolic Vicariate of Eastern Tonking) |
| 1848.12.31 | Italy | Diocese of Gaeta was promoted as Archdiocese of Gaeta |
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