| Date | Country | Change |
| 1943 | Apostolic Exarchate of Belarus (Belarussian Rite) was suppressed | |
| 1943 | Diocese of Padova lost territory to Diocese of Feltre | |
| 1943.01.12 | Apostolic Vicariate of Northern Nigeria was renamed as Apostolic Vicariate of Asaba-Benin (lost territory to establish Apostolic Vicariate of Ondo-Ilorin) | |
| 1943.01.12 | Apostolic Vicariate of Bight of Benin was renamed as Apostolic Vicariate of Lagos (lost territory to establish Apostolic Vicariate of Ondo-Ilorin) | |
| 1943.01.12 | Apostolic Vicariate of Ondo-Ilorin was established (from Apostolic Vicariate of Bight of Benin and Apostolic Vicariate of Northern Nigeria) | |
| 1943.04.14 | Apostolic Prefecture of Mbulu was established (from Apostolic Vicariate of Kilima-Njaro, Apostolic Vicariate of Tabora and Apostolic Prefecture of Dodoma) | |
| 1943.05.15 | Military Vicariate of Peru was established | |
| 1943.05.15 | Diocese of Youngstown was established (from Diocese of Cleveland and became suffragan of Cincinnati) | |
| 1943.05.23 | Diocese of Arequipa was promoted as Metropolitan Archdiocese of Arequipa (with suffragan see Puno) | |
| 1943.05.23 | Diocese of Cusco was promoted as Metropolitan Archdiocese of Cusco (with suffragan see Ayacucho) | |
| 1943.05.23 | Diocese of Trujillo was promoted as Metropolitan Archdiocese of Trujillo (with suffragan sees Cajamarca, Chachapoyas and Piura) | |
| 1943.05.26 | Apostolic Vicariate of Machiques was established (from Diocese of Zulia) | |
| 1943.06.18 | Diocese of La Paz was promoted as Metropolitan Archdiocese of La Paz | |
| 1943.12.02 | Apostolic Prefecture of Accra was established (from Apostolic Vicariate of Gold Coast) | |
| 1943.12.18 | Diocese of San Vicente was established (from Metropolitan Archdiocese of San Salvador and became suffragan of San Salvador) |
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