 | 1940 | 1941 | 1942 |  |
Date | Country | Change |
| 1941 |  Algeria | Titular Episcopal See of Rusadus was renamed as Titular Episcopal See of Rusadus |
| 1941 |  Greece | Titular Episcopal See of Cardicium was renamed as Titular Episcopal See of Cardicium |
| 1941 |  Jordan | Titular Episcopal See of Amathus in Palæstina was renamed as Titular Episcopal See of Amathus in Palæstina |
| 1941 |  Lebanon | Titular Archiepiscopal See of Arca in Armenia (Maronite Rite) was suppressed |
| 1941 |  Turkiye | Titular Episcopal See of Daphnusia was renamed as Titular Episcopal See of Daphnusia |
| 1941 | Turkiye | Titular Episcopal See of Hemeria was renamed as Titular Episcopal See of Hemeria |
| 1941 | Turkiye | Titular Episcopal See of Sauatra was renamed as Titular Episcopal See of Sauatra |
| 1941 | Titular Episcopal See of Torone was suppressed | |
| 1941.01.15 |  Bahamas | Apostolic Prefecture of Bahama was promoted as Apostolic Vicariate of Bahama Islands |
| 1941.01.25 |  USA | Apostolic Vicariate of Hawaiian Islands was promoted as Diocese of Honolulu (became suffragan of San Francisco) |
| 1941.02 |  Poland | Apostolic Administration of Łemkowszczyzna (Ukrainian Rite) was promoted as Apostolic Exarchate of Łemkowszczyzna |
| 1941.04.03 |  Thailand | Apostolic Prefecture of Rajaburi was promoted as Apostolic Vicariate of Rajaburi |
| 1941.05.10 |  Brazil | Diocese of Amargosa was established (from Metropolitan Archdiocese of São Salvador da Bahia and became suffragan of São Salvador da Bahia) |
| 1941.07.03 |  Colombia | Diocese of Antioquía–Jericó was renamed as Diocese of Antioquía (lost territory to establish Diocese of Jericó) |
| 1941.07.03 | Colombia | Diocese of Jericó was restored (from Diocese of Antioquía–Jericó and became suffragan of Medellín) |
| 1941.07.03 | Colombia | Apostolic Prefecture of Urabá was suppressed |
| 1941.07.08 |  Australia | Apostolic Vicariate of Cooktown was promoted as Diocese of Cairns |
| 1941.10.16 |  Indonesia | Apostolic Prefecture of Bandung was promoted as Apostolic Vicariate of Bandung |
| 1941.10.16 | Indonesia | Apostolic Prefecture of Purwokerto was promoted as Apostolic Vicariate of Purwokerto |
| 1941.10.16 | Indonesia | Apostolic Prefecture of Surabaia was promoted as Apostolic Vicariate of Surabaia |
| 1941.10.25 |  Italy | Diocese of Piana dei Greci (Italo-Albanese Rite) was renamed as Diocese of Piana degli Albanesi |
| 1941.11.08 |  Philippines | Diocese of Tagbilaran was established (from Metropolitan Archdiocese of Cebu and became suffragan of Cebu) |
| 1941.11.15 | USA | Diocese of Denver was promoted as Metropolitan Archdiocese of Denver (with suffragan sees Cheyenne and Pueblo and lost territory to establish Diocese of Pueblo) |
| 1941.11.15 | USA | Diocese of Pueblo was established (from Diocese of Denver and became suffragan of Denver) |
| 1941.12.20 | Brazil | Diocese of Oliveira was established (from Metropolitan Archdiocese of Belo Horizonte and became suffragan of Belo Horizonte) |
| 1941.12.23 | Indonesia | Apostolic Vicariate of Padang was renamed as Apostolic Vicariate of Medan |
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