 | 1938 | 1939 | 1940 |  |
Date | Country | Change |
| 1939 |  Hungary | Apostolic Prefecture of Mérk was suppressed (to Metropolitan Archdiocese of Eger) |
| 1939 |  Israel | Titular Archiepiscopal See of Nazareth (Maronite Rite) was suppressed |
| 1939 |  Poland | Metropolitan Archdiocese of Kraków lost territory to Diocese of Nitra and Diocese of Spiš |
| 1939 |  Turkiye | Titular Episcopal See of Acilisene was renamed as Titular Episcopal See of Acilisene |
| 1939 | Turkiye | Titular Episcopal See of Alexandria minor was renamed as Titular Episcopal See of Alexandria minor |
| 1939 | Turkiye | Titular Archiepiscopal See of Tharona was suppressed |
| 1939.01.04 |  Japan | Apostolic Prefecture of Urawa 浦和 was established (from Diocese of Yokohama 横浜 and became suffragan of Tokyo 東京) |
| 1939.01.05 |  Myanmar | Apostolic Prefecture of Bhamo was established (from Apostolic Vicariate of Northern Burma) |
| 1939.01.05 | Myanmar | Apostolic Vicariate of Northern Burma was renamed as Apostolic Vicariate of Mandalay (lost territory to establish Apostolic Prefecture of Bhamo) |
| 1939.01.05 |  Sri Lanka | Diocese of Chilaw was established (from Metropolitan Archdiocese of Colombo and became suffragan of Colombo) |
| 1939.01.13 |  Slovakia | Diocese of Nitra lost territory to Diocese of Katowice |
| 1939.03.15 |  Cameroon | Apostolic Prefecture of Buéa was promoted as Apostolic Vicariate of Buéa |
| 1939.03.15 |  Eswatini | Apostolic Prefecture of Swaziland was promoted as Apostolic Vicariate of Swaziland |
| 1939.03.15 |  Indonesia | Apostolic Prefecture of Malang was promoted as Apostolic Vicariate of Malang |
| 1939.03.15 |  Madagascar | Mission sui juris of Miarinarivo lost territory to Apostolic Prefecture of Morondava |
| 1939.04.01 |  Chile | Diocese of Puerto Montt was established (from Diocese of San Carlos de Ancud) |
| 1939.04.24 |  China | Apostolic Prefecture of Jingxian 景縣 was established (from Apostolic Vicariate of Xianxian 獻縣) |
| 1939.04.25 |  Congo-Kinshasa | Apostolic Vicariate of Kasaï Supérieur lost territory to Apostolic Prefecture of Ipamu |
| 1939.04.25 | Congo-Kinshasa | Apostolic Vicariate of Kwango lost territory to Apostolic Prefecture of Ipamu |
| 1939.04.25 |  Senegal | Apostolic Prefecture of Ziguinchor was established (from Apostolic Vicariate of Dakar) |
| 1939.04.25 |  South Korea,  North Korea | Apostolic Prefecture of Shunsen was established (from Apostolic Vicariate of Seoul 서울) |
| 1939.05.13 |  Italy | Diocese of Ceneda was renamed as Diocese of Vittorio Veneto |
| 1939.05.20 | Chile | Diocese of Concepción was promoted as Metropolitan Archdiocese of Concepción (with suffragan sees Chillán, Puerto Montt, San Carlos de Ancud and Temuco) |
| 1939.05.25 | Madagascar | Apostolic Vicariate of Majunga lost territory to Apostolic Vicariate of Miarinarivo |
| 1939.05.25 | Madagascar | Mission sui juris of Miarinarivo was promoted as Apostolic Vicariate of Miarinarivo (gained territory from Apostolic Vicariate of Majunga and Apostolic Vicariate of Tananarive) |
| 1939.05.25 | Madagascar | Apostolic Prefecture of Vatomandry was promoted as Apostolic Vicariate of Tamatave |
| 1939.05.25 | Madagascar | Apostolic Vicariate of Tananarive lost territory to Apostolic Vicariate of Miarinarivo |
| 1939.05.25 |  Uganda | Apostolic Vicariate of Masaka was established (from Apostolic Vicariate of Uganda) |
| 1939.05.29 | Chile | Diocese of La Serena was promoted as Metropolitan Archdiocese of La Serena |
| 1939.06.03 |  Argentina | Diocese of Resistencia was established (from Metropolitan Archdiocese of Santa Fe and became suffragan of Santa Fe) |
| 1939.06.03 |  Philippines | Diocese of Surigao was established (from Diocese of Cagayan de Oro and became suffragan of Cebu) |
| 1939.06.13 | Indonesia | Apostolic Prefecture of Benkoelen was promoted as Apostolic Vicariate of Palembang |
| 1939.06.13 |  South Africa | Apostolic Vicariate of Cape of Good Hope, Western District was renamed as Apostolic Vicariate of Cape Town |
| 1939.06.13 | South Africa | Apostolic Prefecture of Cape of Good Hope, Central District was renamed as Apostolic Prefecture of Oudtshoorn |
| 1939.06.13 | South Africa | Apostolic Prefecture of Northern Transvaal was promoted as Territorial Abbacy of Pietersburg |
| 1939.06.13 | South Africa | Apostolic Vicariate of Cape of Good Hope, Eastern District was renamed as Apostolic Vicariate of Port Elizabeth |
| 1939.06.22 |  Libya | Apostolic Vicariate of Cirenaica was renamed as Apostolic Vicariate of Benghazi (lost territory to establish Apostolic Vicariate of Derna) |
| 1939.06.22 | Libya | Apostolic Vicariate of Derna was established (from Apostolic Vicariate of Cirenaica) |
| 1939.06.22 | Libya | Apostolic Prefecture of Misurata was established (from Apostolic Vicariate of Tripolitana) |
| 1939.06.22 | Libya | Apostolic Vicariate of Tripolitana was renamed as Apostolic Vicariate of Tripoli (lost territory to establish Apostolic Prefecture of Misurata) |
| 1939.07.11 | China | Apostolic Prefecture of Yanggu 陽穀 was promoted as Apostolic Vicariate of Yanggu 陽穀 |
| 1939.07.11 | Congo-Kinshasa | Apostolic Vicariate of Haut-Congo was renamed as Apostolic Vicariate of Baudouinville |
| 1939.07.11 | North Korea | Apostolic Prefecture of Peng-yang was promoted as Apostolic Vicariate of Heijo |
| 1939.07.11 | South Africa | Apostolic Prefecture of Mount Currie was promoted as Apostolic Vicariate of Kokstad |
| 1939.07.11 |  Vietnam | Apostolic Prefecture of Lang Són et Cao Bang was promoted as Apostolic Vicariate of Lang Són et Cao Bang |
| 1939.07.19 | Slovakia | Apostolic Administration of Košice na Slovensku was established (from Diocese of Košice) |
| 1939.07.19 | Slovakia | Apostolic Administration of Rožňava na Slovensku was established (from Diocese of Rožňava) |
| 1939.07.19 | Slovakia | Apostolic Administration of Szatmár na Slovensku was established (from Diocese of Satu Mare) |
| 1939.07.19 | Slovakia | Apostolic Administration of Trnava lost territory to Metropolitan Archdiocese of Esztergom |
| 1939.07.20 | China | Apostolic Prefecture of Wuzhou 梧州 was promoted as Apostolic Vicariate of Wuzhou 梧州 |
| 1939.07.20 | Italy | Diocese of Massa Carrara was renamed as Diocese of Apuania |
| 1939.07.20 |  Pakistan | Apostolic Prefecture of Multan was promoted as Diocese of Multan (became suffragan of Delhi and Simla) |
| 1939.07.22 |  Brazil | Diocese of Caxias do Maranhão was established (from Metropolitan Archdiocese of São Luís do Maranhão and became suffragan of São Luís do Maranhão) |
| 1939.07.22 | Brazil | Territorial Prelature of Pinheiro was established (from Metropolitan Archdiocese of São Luís do Maranhão and Territorial Prelature of São José do Grajaú and became suffragan of São Luís do Maranhão) |
| 1939.07.22 |  USA | Metropolitan Archdiocese of Baltimore was renamed as Metropolitan Archdiocese of Baltimore–Washington |
| 1939.09.17 |  Belarus | Apostolic Exarchate of Belarus (Belarussian Rite) was established |
| 1939.09.17 |  Ukraine | Apostolic Exarchate of Velyka Ukraina was established |
| 1939.09.17 | Ukraine,  Germany | Apostolic Exarchate of Volhynia, Polesia and Pidliashia (Ukrainian Rite) was established |
| 1939.10.05 |  Syria | Apostolic Vicariate of Aleppo lost territory to Apostolic Vicariate of Constantinopole |
| 1939.10.20 | China | Ordinariate of Harbin 哈爾濱 (Russian Rite) was promoted as Apostolic Exarchate of Harbin 哈爾濱 |
| 1939.11.11 |  Albania | Apostolic Administration of Southern Albania was established (from Archdiocese of Durrës and became suffragan of Shkodrë) |
| 1939.11.14 | Congo-Kinshasa | Apostolic Prefecture of Luapula Supérieur was promoted as Apostolic Vicariate of Sakania |
| 1939.11.25 | Brazil | Diocese of Caicó was established (from Diocese of Natal and became suffragan of Paraíba) |
| 1939.12.09 | Syria | Apostolic Vicariate of Aleppo lost territory to Apostolic Vicariate of Constantinopole |
| 1939.12.16 | USA | Diocese of Gallup was established (from Metropolitan Archdiocese of Santa Fe and Diocese of Tucson and became suffragan of Santa Fe) |
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