| Date | From | To | ||
|---|---|---|---|---|
| unknown | Society of Divine Vocations | Founded | ||
| unknown | Nunciature to Yugoslavia | Established | ||
| unknown | Nunciature to Germany | Established | ||
| unknown | Nunciature to Hungary | Established | ||
| unknown | Prefecture Apostolic of Schlewig-Holstein, Germany (North Schleswig) | Territory Lost | Vicariate Apostolic of Denmark | Territory Added |
| 16 Jan | Diocese of San Luis Potosí, México (District of Pinos) | Territory Lost | Diocese of Zacatecas, México | Territory Added |
| 16 Jan | Diocese of Zacatecas, México (Salinas) | Territory Lost | Diocese of San Luis Potosí, México | Territory Added |
| 13 Feb | Diocese of Maceió, Brazil | Elevated | Archdiocese of Maceió, Alagoas, Brazil | Elevated |
| 13 Feb | Diocese of Penedo, Alagoas, Brazil (from Olinda e Recife) | Metropolitan Changed | ||
| 13 Feb | Diocese of Aracajú, Brazil (from São Salvador da Bahia) | Metropolitan Changed | ||
| 20 Feb | Diocese of San Severino (Marche), Italy
Diocese of Treia, Italy | United | Diocese of San Severino (-Treia), Italy | United |
| 24 Feb | Diocese of Trento, Italy (from Salzburg to Immediately Subject) | Metropolitan Changed | ||
| 8 Apr | Diocese of Gerace, Italy | Name Changed | Diocese of Gerace (-Santa Maria di Polsi), Italy | Name Changed |
| 9 Apr | Vicariate Apostolic of Canton [Guangzhou], China (Northern part) | Territory Lost | Vicariate Apostolic of Shiuchow [Shaoguan], China | Erected |
| 15 Apr | Nunciature to Venezuela (to Nunciature) | Elevated | ||
| 16 Apr | Prefecture Apostolic of Lower Niger {Niger Inferiore}, Nigeria | Elevated | Vicariate Apostolic of Southern Nigeria {Nigeria Meridionale} | Elevated |
| 18 Apr | Prefecture Apostolic of Guinea Francese, Guinea | Elevated | Vicariate Apostolic of Guinea Francese, Guinea | Elevated |
| 30 Apr | Diocese of Senj (-Modruš), Croatia | Territory Lost | Apostolic Administration of Fiume / Rijeka, Croatia | Erected |
| 15 May | Nunciature to Czechoslovakia | Established | ||
| 20 May | Diocese of Catamarca, Argentina (de los Andes) | Territory Lost | Diocese of Salta, Argentina | Territory Added |
| 3 Jun | Archdiocese of Köln {Cologne}, Germany (Schulte-Kemna family estates) | Territory Lost | Diocese of Paderborn, Germany | Territory Added |
| 8 Jun | Archdiocese of Mohilev, Belarus (Finland) | Territory Lost | Vicariate Apostolic of Finland {Finlandia} | Erected |
| 9 Jun | Diocese of Žemaičiai (Samogizia o Tels; Żmudź), Lithuania (Courland (within Latvia)) | Territory Lost | Diocese of Riga, Latvia | Territory Added |
| 11 Jun | Diocese of Manizales, Colombia (Alcalá (La Balsa)) | Territory Lost | Diocese of Cali, Colombia | Territory Added |
| 16 Jun | Nunciature to Romania | Established | ||
| 18 Jun | Diocese of Piaui, Brazil (Sâo Raymundo Nonnato, Bon Jesus do Gurgucia, Paranaguà, Gorrente, and S. Filomena) | Territory Lost | Territorial Prelature of Bom Jesus do Piauí, Piaui, Brazil | Erected |
| 19 Jun | Archdiocese of Montréal, Québec, Canada (Part of parish of St. Anna des Plaines) | Territory Lost | Diocese of Joliette, Québec, Canada | Territory Added |
| 2 Jul | Diocese of Oran, Algeria (Southern part) | Territory Lost | Prefecture Apostolic of Ghardaïa, Algeria | Territory Added |
| 7 Jul | Diocese of Comacchio, Italy
Archdiocese of Ferrara, Italy | Split | ||
| 16 Jul | Delegation to East Indies (Added Burma) | Territory Added | ||
| 1 Aug | Vicariate Apostolic of Canton [Guangzhou], China (Hainan Island and the Western part) | Territory Lost | Vicariate Apostolic of Western Kwangtung and Hainan {Kuangtong Occidentale et Hainan}, China | Erected |
| 1 Aug | Nunciature to Switzerland | Restored | ||
| 5 Aug | Vicariate Apostolic of Seul, Korea (South) (Ham-Kiang-to (North and South)) | Territory Lost | Vicariate Apostolic of Wonsan, Korea (North) | Erected |
| 6 Aug | Nunciature to Paraguay (to Nunciature) | Elevated | ||
| 25 Aug | Vicariate Apostolic of Southern Kiangsi {Kiam-Si Meridionale}, China (Roncho w-fu, Nan-an-fu, and Ning-tu-chow) | Territory Lost | Vicariate Apostolic of Kanchow [Ganzhou], China | Erected |
| 25 Aug | Vicariate Apostolic of Southern Kiangsi {Kiam-Si Meridionale}, China (Yuen-chow-fu and Ling-Kian-fu) | Territory Lost | Vicariate Apostolic of Kingan, China | Territory Added |
| 25 Aug | Vicariate Apostolic of Southern Kiangsi {Kiam-Si Meridionale}, China | Name Changed | Vicariate Apostolic of Kingan, China | Name Changed |
| 25 Aug | Vicariate Apostolic of Eastern Kiangsi {Kiam-Si Orientale}, China | Name Changed | Vicariate Apostolic of Fu-Chow (Fu-Kow), China | Name Changed |
| 25 Aug | Vicariate Apostolic of Northern Kiangsi {Kiam-Si Settentrionale}, China | Name Changed | Vicariate Apostolic of Kiou-Kiang, China | Name Changed |
| 29 Aug | Prefecture Apostolic of Nuova Guinea Olandese, Indonesia | Elevated | Vicariate Apostolic of Nuova Guinea Olandese, Indonesia | Elevated |
| 29 Oct | Archdiocese of Belém do Pará, Brazil (from the rivers Rio Fresco and Xingü to the borders of Matto-Grossense) | Territory Lost | Territorial Prelature of Santíssima Conceição do Araguaia, Brazil | Territory Added |
| 12 Nov | Delegation to Albania | Established | ||
| 17 Nov | Prefecture Apostolic of Northern Ontario (Ontario-Nord), Canada | Elevated | Vicariate Apostolic of Northern Ontario (Ontario-Nord), Canada | Elevated |
| 17 Nov | Compagnia di San Paolo | Founded | ||
| 10 Dec | Archdiocese of Warszawa {Warsaw}, Poland (Lodz, Lancic, and Klodaviens) | Territory Lost | Diocese of Łódź, Poland | Erected |
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