| Date | From | To | ||
|---|---|---|---|---|
| unknown | Delegation to Mesopotamia, Kurdistan, and Lesser Armenia, Iraq | Name Changed | Delegation to Iraq | Name Changed |
| 3 Jan | Diocese of Sault Sainte Marie and Marquette, Michigan, USA | Name Changed | Diocese of Marquette, Michigan, USA | Name Changed |
| 5 Jan | Diocese of Savannah, Georgia, USA | Name Changed | Diocese of Savannah-Atlanta, Georgia, USA | Name Changed |
| 4 Feb | Vicariate Apostolic of Lanchowfu, China (Tsinghai) | Territory Lost | Prefecture Apostolic of Xining [Sining], China | Erected |
| 13 Feb | Diocese of Santa Maria, Rio Grande do Sul, Brazil (Rio Pardo and Candelaria) | Territory Lost | Archdiocese of Porto Alegre, Rio Grande do Sul, Brazil | Territory Added |
| 22 Feb | Vicariate Apostolic of Buta, Congo (Dem. Rep.) (Lolo and Moenge) | Territory Lost | Prefecture Apostolic of Lolo, Congo (Dem. Rep.) | Erected |
| 22 Feb | Vicariate Apostolic of Wuhu [Wuhu], China (Tsiki, ñhenhsien, Siuning, Kimen, Ihsien in the civil province of Anhwei, as well as the civil sub-prefecture of Wuyuan in the civil province of Kiangsi) | Territory Lost | Prefecture Apostolic of Tunxi [Tunki], China | Erected |
| 27 Feb | Diocese of Pembroke, Ontario, Canada (Boundaries adjusted)
Diocese of Sault Sainte Marie, Ontario, Canada (Boundaries adjusted) | Territory Added | ||
| 9 Mar | Vicariate Apostolic of Bamako, Mali (French Guinea) | Territory Lost | Prefecture Apostolic of N’Zérékoré, Guinea | Erected |
| 9 Mar | Vicariate Apostolic of Bobo-Dioulasso, Burkina Faso (Dmvdougou and Belekouo) | Territory Lost | Vicariate Apostolic of Bamako, Mali | Territory Added |
| 9 Mar | Vicariate Apostolic of Ouagadougou, Burkina Faso (Dagari de Niego and Dagari de Bozo) | Territory Lost | Vicariate Apostolic of Bobo-Dioulasso, Burkina Faso | Territory Added |
| 9 Mar | Prefecture Apostolic of Bobo-Dioulasso, Burkina Faso | Elevated | Vicariate Apostolic of Bobo-Dioulasso, Burkina Faso | Elevated |
| 20 Mar | Diocese of Osimo e Cingoli, Italy (S. Maria ab Ulmo) | Territory Lost | Diocese of Jesi, Italy | Territory Added |
| 20 Mar | Archdiocese of Saint-Boniface, Manitoba, Canada (Boundaries adjusted to match civil boundaries)
Archdiocese of Winnipeg, Manitoba, Canada (Boundaries adjusted to match civil boundaries) | Territory Added | ||
| 25 Mar | Vicariate Apostolic of Galla, Ethiopia
Prefecture Apostolic of Kaffa, Ethiopia | Territory Lost | Prefecture Apostolic of Neghelli, Ethiopia (Sidamo and Borana (in Galla and Sidamo)) | Erected |
| 25 Mar | Vicariate Apostolic of Galla, Ethiopia | Name Changed | Vicariate Apostolic of Harar, Ethiopia | Name Changed |
| 25 Mar | Prefecture Apostolic of Kaffa, Ethiopia | Elevated | Vicariate Apostolic of Gimma, Ethiopia (and Name Changed) | Elevated |
| 25 Mar | Vicariate Apostolic of Abyssinia, Ethiopia (Uolio? and Debre Berhan) | Territory Lost | Prefecture Apostolic of Dessié, Ethiopia | Erected |
| 25 Mar | Vicariate Apostolic of Abyssinia, Ethiopia (Gondar, Semien, Gojjam, and Begemder) | Territory Lost | Prefecture Apostolic of Gondar, Ethiopia | Erected |
| 25 Mar | Vicariate Apostolic of Abyssinia, Ethiopia (Adwa, Mekelle, Adigrat, Abiy Addi, and Alamata) | Territory Lost | Prefecture Apostolic of Tigrai, Ethiopia | Erected |
| 25 Mar | Vicariate Apostolic of Abyssinia, Ethiopia | Territory Lost | Vicariate Apostolic of Addis Abeba, Ethiopia (Addis Abeba) | Erected |
| 25 Mar | Delegation to Egypt, Arabia, Eritrea, Ethiopia, Palestine, TransJordan, and Island of Cyprus | Established | Delegation to Italian East Africa, Ethiopia | Established |
| 25 Mar | Delegation to Egypt, Arabia, Eritrea, Ethiopia, Palestine, TransJordan, and Island of Cyprus | Name Changed | Delegation to Egypt and Arabia | Name Changed |
| 25 Mar | Vicariate Apostolic of Mogadiscio, Somalia (Boundaries adjusted to now cover Somalia and no more) | Territory Added | ||
| 25 Mar | Prefecture Apostolic of Djibouti (Gibuti) (Boundaries adjusted to now cover French Somalia and no more) | Territory Added | ||
| 13 Apr | Vicariate Apostolic of Central Oceania, Tonga | Name Changed | Vicariate Apostolic of Tonga Islands {Isole Tonga}, Pacific (Oceania) | Name Changed |
| 13 Apr | Vicariate Apostolic of Taiku, Korea (South) (Zenra Holmdo (Northern Chonla)) | Territory Lost | Prefecture Apostolic of Zenshu, Korea (South) | Erected |
| 13 Apr | Vicariate Apostolic of Taiku, Korea (South) (Zenra Nando) | Territory Lost | Prefecture Apostolic of Kwoszu, Korea (South) | Erected |
| 13 Apr | Vicariate Apostolic of Kasaï Superiore, Congo (Dem. Rep.) (Basongo-Brabant)
Vicariate Apostolic of Koango o Kwango, Congo (Dem. Rep.) (Niadi and Kamtseha-Loange) | Territory Lost | Prefecture Apostolic of Ipamu, Congo (Dem. Rep.) | Erected |
| 13 Apr | Vicariate Apostolic of Célebes, Indonesia (Makassar (Gouvernment van Geleites en Onderhoorigheden)) | Territory Lost | Prefecture Apostolic of Makassar, Indonesia | Erected |
| 13 Apr | Vicariate Apostolic of Célebes, Indonesia | Name Changed | Vicariate Apostolic of Manado, Indonesia | Name Changed |
| 13 Apr | Archdiocese of Agra, India (Delhi and Punjab)
Archdiocese of Simla, India | Territory Lost | Archdiocese of Delhi and Simla, India (and Name Change) | Territory Added |
| 13 Apr | Prefecture Apostolic of Umtata, South Africa | Elevated | Vicariate Apostolic of Umtata, South Africa | Elevated |
| 13 Apr | Mission "Sui Iuris" of Bezwada, India | Elevated | Diocese of Bezwada, India | Elevated |
| 13 Apr | Prefecture Apostolic of Yenki [Yanji], China | Elevated | Vicariate Apostolic of Yenki [Yanji], China | Elevated |
| 13 Apr | Mission "Sui Iuris" of Ilan, China | Name Changed | Mission "Sui Iuris" of Kiamusze [Jiamusi], China | Name Changed |
| 13 Apr | Prefecture Apostolic of Bulawayo, Zimbabwe | Elevated | Vicariate Apostolic of Bulawayo, Zimbabwe | Elevated |
| 8 May | Archdiocese of Riga, Latvia (Courland and Semigallia) | Territory Lost | Diocese of Liepāja, Latvia | Erected |
| 8 May | Archdiocese of Riga, Latvia (became a Metropolitan) | Elevated | ||
| 18 May | Prefecture Apostolic of Changtien, China | Territory Lost | Vicariate Apostolic of Chowtsun [Zhoucun], China | Erected |
| 18 May | Prefecture Apostolic of Kweiteh [Shangqiu], China (Kaocheng) | Territory Lost | Vicariate Apostolic of Kaifeng [Kaifeng] (Kaifengfu), China | Territory Added |
| 18 May | Prefecture Apostolic of Chuchow, China | Name Changed | Prefecture Apostolic of Lishui [Lishui], China | Name Changed |
| 18 May | Vicariate Apostolic of Togo (Sokodé, Bassari, Lama-Kara, and Sansanné-Mango) | Territory Lost | Prefecture Apostolic of Sokodé, Togo | Erected |
| 18 May | Vicariate Apostolic of Szepingkai [Siping], China | Territory Lost | Prefecture Apostolic of Lintong [Lintung], China | Erected |
| 18 May | Prefecture Apostolic of Kweiteh [Shangqiu], China | Elevated | Vicariate Apostolic of Kweiteh [Shangqiu], China | Elevated |
| 22 May | Diocese of Detroit, Michigan, USA (Ionia, Clinton, Allegan, Barry, Eaton, Ingham, Van Buren, Kalamazoo, Calhoun, Jackson, Berrien, Cass, St. Joseph, Branch, and Hillsdale) | Territory Lost | Diocese of Lansing, Michigan, USA | Erected |
| 22 May | Diocese of Detroit, Michigan, USA | Elevated | Archdiocese of Detroit, Michigan, USA | Elevated |
| 22 May | Diocese of Grand Rapids, Michigan, USA (from Cincinnati) | Metropolitan Changed | ||
| 22 May | Diocese of Marquette, Michigan, USA (from Milwaukee) | Metropolitan Changed | ||
| 1 Jun | Mission "Sui Iuris" of Cuttack, India | Elevated | Diocese of Cuttack, India | Elevated |
| 5 Jun | Diocese of Nocera Umbra-Gualdo Tadino, Italy (S. Helena di Annifo) | Territory Lost | Diocese of Foligno, Italy | Territory Added |
| 17 Jun | Diocese of Osaka, Japan (Kyoto and Shiga) | Territory Lost | Prefecture Apostolic of Kyoto, Japan | Erected |
| 17 Jun | Vicariate Apostolic of Hankow [Hankou], China (Suihsien, Ingshanhsien, and Anluhsien) | Territory Lost | Prefecture Apostolic of Suixian [Suihsien], China | Erected |
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