 | 1869 | 1870 | 1871 |  |
Date | Country | Change |
| 1870 |  Canada | Diocese of Saint John in America lost territory to Diocese of Portland in Maine |
| 1870 |  Israel | Titular Episcopal See of Akka was suppressed (to Titular Episcopal See of Ptolemais) |
| 1870 |  USA | Apostolic Vicariate of Colorado and Utah was renamed as Apostolic Vicariate of Colorado |
| 1870.03.11 | USA | Apostolic Vicariate of Florida was promoted as Diocese of Saint Augustine (became suffragan of Baltimore) |
| 1870.03.12 |  Mexico | Apostolic Vicariate of Tamaulipas was promoted as Diocese of Ciudad Victoria–Tamaulipas (gained territory from Metropolitan Archdiocese of México) |
| 1870.03.12 | Mexico | Metropolitan Archdiocese of México lost territory to Diocese of Ciudad Victoria–Tamaulipas |
| 1870.03.18 | Canada | Diocese of Toronto was promoted as Metropolitan Archdiocese of Toronto (with suffragan sees Hamilton, Kingston and London) |
| 1870.03.23 |  Ecuador | Diocese of Portoviejo was established (from Metropolitan Archdiocese of Quito and Diocese of Guayaquil and became suffragan of Quito) |
| 1870.06.14 | USA | Diocese of Springfield in Massachusetts was established (from Diocese of Boston and became suffragan of New York) |
| 1870.07.19 |  India | Mission sui juris of Central Bengal was promoted as Apostolic Prefecture of Central Bengal |
| 1870.07.19 |  Myanmar | Apostolic Vicariate of Central Burma was renamed as Apostolic Vicariate of Northern Burma |
| 1870.07.19 | Myanmar | Apostolic Vicariate of Southwestern Burma was renamed as Apostolic Vicariate of Southern Burma |
| 1870.08.24 |  Nigeria | Apostolic Vicariate of Dahomey was renamed as Apostolic Vicariate of Bight of Benin |
| 1870.08.29 |  Italy | Diocese of Como lost territory to Diocese of Chur |
| 1870.09.02 |  China | Apostolic Vicariate of Southwestern Hupeh 湖北南境 was established (from Apostolic Vicariate of Hupeh 湖北) |
| 1870.09.11 | China | Apostolic Vicariate of Hupeh 湖北 was renamed as Apostolic Vicariate of Eastern Hupeh 湖北東境 (lost territory to establish Apostolic Vicariate of Northwestern Hupeh 湖北西北) |
| 1870.09.11 | China | Apostolic Vicariate of Northwestern Hupeh 湖北西北 was established (from Apostolic Vicariate of Hupeh 湖北) |
| 1870.09.16 | Canada | Apostolic Prefecture of Placentia was established (from Diocese of Harbour Grace and Diocese of Saint John’s, Newfoundland and became suffragan of Halifax) |
| 1870.09.16 | Canada | Apostolic Prefecture of Western Newfoundland was established (from Diocese of Saint John’s, Newfoundland and became suffragan of Halifax) |
| 1870.09.27 |  Luxembourg | Apostolic Vicariate of Luxembourg was promoted as Diocese of Luxembourg (without ecclesiastical province) |
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