 | 1939 | 1940 | 1941 |  |
Date | Country | Change |
| 1940 |  Algeria | Titular Episcopal See of Acufida was renamed as Titular Episcopal See of Acafida |
| 1940 |  Tunisia | Titular Episcopal See of Abbir maius was renamed as Titular Episcopal See of Abbir Maius |
| 1940.01.01 |  Poland | Diocese of Katowice lost territory to Metropolitan Archdiocese of Wrocław |
| 1940.01.12 |  India | Apostolic Prefecture of Jhansi was established (from Diocese of Allahabad and became suffragan of Agra) |
| 1940.01.12 | India | Diocese of Lucknow was established (from Metropolitan Archdiocese of Agra and Diocese of Allahabad and became suffragan of Agra) |
| 1940.01.12 |  North Korea | Apostolic Vicariate of Wonsan 원산 was renamed as Apostolic Vicariate of Kanko (lost territory to establish Territorial Abbacy of Tŏkugen) |
| 1940.01.12 | North Korea | Territorial Abbacy of Tŏkugen was established (from Apostolic Vicariate of Wonsan 원산) |
| 1940.01.13 |  Canada | Apostolic Vicariate of Keewatin lost territory to Apostolic Vicariate of Baie d’Hudson |
| 1940.02.13 |  China | Apostolic Prefecture of Fushun 撫順 was promoted as Apostolic Vicariate of Fushun 撫順 |
| 1940.02.13 |  Ethiopia | Apostolic Prefecture of Endeber was established (from Apostolic Vicariate of Gimma) |
| 1940.02.13 | Ethiopia | Apostolic Prefecture of Hosanna was established (from Apostolic Vicariate of Gimma and Apostolic Prefecture of Neghelli) |
| 1940.02.13 | India | Diocese of Bangalore was established (from Diocese of Mysore and became suffragan of Pondicherry) |
| 1940.02.13 | India | Diocese of Coimbatore lost territory to Diocese of Mysore |
| 1940.02.13 | India | Diocese of Guntur was established (from Diocese of Nellore and became suffragan of Madras) |
| 1940.02.17 |  Chile | Apostolic Prefecture of Aysén was established (from Diocese of San Carlos de Ancud) |
| 1940.02.29 |  Peru | Diocese of Piura was established (from Diocese of Trujillo and became suffragan of Lima) |
| 1940.04.09 | China | Mission sui juris of Jiamusi 佳木斯 was promoted as Apostolic Prefecture of Jiamusi 佳木斯 |
| 1940.04.09 |  Cote d’Ivoire | Apostolic Vicariate of Costa d’Avorio was renamed as Apostolic Vicariate of Abidjan (lost territory to establish Apostolic Vicariate of Sassandra) |
| 1940.04.09 | Cote d’Ivoire | Apostolic Vicariate of Sassandra was established (from Apostolic Vicariate of Costa d’Avorio) |
| 1940.05.28 |  Central African Republic | Apostolic Vicariate of Oubangui Chari was renamed as Apostolic Vicariate of Bangui (lost territory to establish Apostolic Prefecture of Berbérati) |
| 1940.05.28 | Central African Republic | Apostolic Prefecture of Berbérati was established (from Apostolic Vicariate of Foumban and Apostolic Vicariate of Oubangui Chari) |
| 1940.06.25 |  Congo-Kinshasa | Mission sui juris of Bikoro was promoted as Apostolic Prefecture of Bikoro |
| 1940.06.25 |  Indonesia | Apostolic Vicariate of Semarang was established (from Apostolic Vicariate of Batavia) |
| 1940.07.09 |  Myanmar | Apostolic Prefecture of Akyab was established (from Diocese of Chittagong) |
| 1940.07.09 |  South Africa | Apostolic Vicariate of Orange River was renamed as Apostolic Vicariate of Keimoes |
| 1940.07.13 |  Brazil | Territorial Prelature of Chapada was established (from Metropolitan Archdiocese of Cuiabá, Diocese of Corumbá and Territorial Prelature of Registro do Araguaia and became suffragan of Cuiabá) |
| 1940.09.04 |  Angola | Apostolic Prefecture of Cubango in Angola was suppressed (to establish Diocese of Nova Lisboa) |
| 1940.09.04 | Angola | Mission sui juris of Cunène was suppressed (to establish Diocese of Nova Lisboa) |
| 1940.09.04 | Angola | Apostolic Prefecture of Lower Congo in Cubango was suppressed (to Metropolitan Archdiocese of Luanda) |
| 1940.09.04 | Angola | Diocese of São Paulo de Loanda was promoted as Metropolitan Archdiocese of Luanda (with suffragan sees Nova Lisboa, São Tomé and Silva Porto, gained territory from the suppressed Apostolic Prefecture of Lower Congo in Cubango and Mission sui juris of Lunda and lost territory to establish Diocese of Nova Lisboa and Diocese of Silva Porto) |
| 1940.09.04 | Angola | Mission sui juris of Lunda was suppressed (to Metropolitan Archdiocese of Luanda) |
| 1940.09.04 | Angola | Diocese of Nova Lisboa was established (from Diocese of São Paulo de Loanda, from the suppressed Apostolic Prefecture of Cubango in Angola and Mission sui juris of Cunène and became suffragan of Luanda) |
| 1940.09.04 | Angola | Diocese of Silva Porto was established (from Diocese of São Paulo de Loanda and became suffragan of Luanda) |
| 1940.09.04 |  Guinea-Bissau | Mission sui juris of Portuguese Guinea was established (from Diocese of Santiago de Cabo Verde) |
| 1940.09.04 |  Mozambique | Diocese of Beira was established (from Territorial Prelature of Mozambique and became suffragan of Lourenço Marques) |
| 1940.09.04 | Mozambique | Territorial Prelature of Mozambique was promoted as Metropolitan Archdiocese of Lourenço Marques (with suffragan sees Beira and Nampula and lost territory to establish Diocese of Beira and Diocese of Nampula) |
| 1940.09.04 | Mozambique | Diocese of Nampula was established (from Territorial Prelature of Mozambique and became suffragan of Lourenço Marques) |
| 1940.09.04 |  Timor-Leste | Diocese of Díli was established (from Diocese of Macau 澳門 and became suffragan of Goa and Daman) |
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