 | 1944 | 1945 | 1946 |  |
Date | Country | Change |
| 1945 |  Poland | Diocese of Przemyśl lost territory to Metropolitan Archdiocese of Lviv |
| 1945 |  Slovakia | Apostolic Administration of Košice na Slovensku was suppressed (to Diocese of Košice) |
| 1945 | Slovakia | Apostolic Administration of Rožňava na Slovensku was suppressed (to Diocese of Rožňava) |
| 1945.06.15 |  Colombia | Apostolic Prefecture of Labateca was established (from Diocese of Nueva Pamplona and Apostolic Prefecture of Arauca) |
| 1945.07.13 |  Canada | Apostolic Vicariate of Labrador was established (from Diocese of Harbour Grace, Apostolic Vicariate of Baie d’Hudson and Apostolic Vicariate of Golfe Saint-Laurent and became suffragan of Saint John’s, Newfoundland) |
| 1945.07.13 |  Peru | Apostolic Prefecture of San José de Amazonas was established (from Apostolic Vicariate of San León del Amazonas) |
| 1945.08.01 | Peru | Apostolic Vicariate of San León del Amazonas was renamed as Apostolic Vicariate of Iquitos |
| 1945.08.04 |  USA | Diocese of Omaha was promoted as Metropolitan Archdiocese of Omaha (with suffragan sees Grand Island and Lincoln) |
| 1945.08.11 |  Italy | Metropolitan Archdiocese of Acerenza lost territory to Archdiocese of Matera |
| 1945.08.15 | Poland | Apostolic Administration of Upper Silesia was established (from Metropolitan Archdiocese of Olomouc and Metropolitan Archdiocese of Wrocław) |
| 1945.09.01 | Poland | Territorial Prelature of Schneidemühl was renamed as Territorial Prelature of Piła |
| 1945.10.03 |  Austria | Ordinariate of Ordinariat d’Autriche de rite oriental (Eastern Rite) was established |
| 1945.11.24 | Canada | Diocese of Chicoutimi lost territory to Diocese of Golfe Saint-Laurent |
| 1945.11.24 | Canada | Apostolic Vicariate of Golfe Saint-Laurent was promoted as Diocese of Golfe Saint-Laurent (gained territory from Diocese of Chicoutimi) |
| 1945.11.24 | Italy | Diocese of Capaccio–Vallo was renamed as Diocese of Vallo di Lucania |
| 1945.12.14 |  Ecuador | Apostolic Prefecture of Esmeraldas was established (from Diocese of Portoviejo) |
| 1945.12.22 | Canada | Diocese of Kamloops was established (from Metropolitan Archdiocese of Vancouver and became suffragan of Vancouver) |
| 1945.12.22 | USA | Diocese of Madison was established (from Metropolitan Archdiocese of Milwaukee, Diocese of Green Bay and Diocese of La Crosse and became suffragan of Milwaukee) |
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