| Date | From | To | ||
|---|---|---|---|---|
| unknown | Apostolic Administration of Srpski Banat, Serbia | Name Changed | Apostolic Administration of Jugoslavenska Banat, Serbia | Name Changed |
| unknown | Pontifical Academy of Sciences, Roman Curia | Erected | ||
| 11 Jan | Diocese of Pinsk, Belarus (Wodzld, Sciony, and Kiewlahi) | Territory Lost | Diocese of Łomża, Poland | Territory Added |
| 27 Jan | Prefecture Apostolic of Gariep, South Africa | Elevated | Vicariate Apostolic of Aliwal, South Africa | Elevated |
| 27 Jan | Vicariate Apostolic of Senegambia, Senegal | Name Changed | Vicariate Apostolic of Dakar, Senegal | Name Changed |
| 27 Jan | Vicariate Apostolic of Anking [Anqing], China (Yngshan)
Prefecture Apostolic of Hwangchow, China | Elevated | Vicariate Apostolic of Kichow [Qichun], China | Elevated |
| 27 Jan | Vicariate Apostolic of Nouvelle-Anvers, Congo (Dem. Rep.) | Name Changed | Vicariate Apostolic of Lisala, Congo (Dem. Rep.) | Name Changed |
| 27 Jan | Prefecture Apostolic of Sénégal | Name Changed | Prefecture Apostolic of Saint-Louis du Sénégal | Name Changed |
| 22 Feb | Diocese of Chatham, New Brunswick, Canada (County of Kent)
Diocese of Saint John, New Brunswick, Canada (Counties of Westmorland, Albert, Kent, and some French parishes in the County of Northumberland) | Territory Lost | Archdiocese of Moncton, New Brunswick, Canada | Erected |
| 22 Feb | Archdiocese of Vancouver, British Columbia, Canada (Deanery of Nelson, Cranbrook, and part of Keloiona) | Territory Lost | Diocese of Nelson, British Columbia, Canada | Erected |
| 22 Feb | Diocese of Chatham, New Brunswick, Canada (from Halifax to Moncton) | Metropolitan Changed | ||
| 22 Feb | Diocese of Saint John, New Brunswick, Canada (from Halifax to Moncton) | Metropolitan Changed | ||
| 4 Mar | Society of Bethlehem Mission Immensee | Approbation | ||
| 9 Mar | Diocese of Hakodate, Japan | Name Changed | Diocese of Sendai, Japan | Name Changed |
| 9 Mar | Vicariate Apostolic of Bůi Chu, Viet Nam (Nam-Dinh (Thai-Binh, Humg-Yen, and Nam-Dinh)) | Territory Lost | Vicariate Apostolic of Thái Binh, Viet Nam | Erected |
| 9 Mar | Vicariate Apostolic of Northern Burma {Birmania Settentrionale}, Myanmar (Shan de Tawng Peng, Hsenwi Septentrionali, Hsenwi Meridionali, and part of Munglun) | Territory Lost | Prefecture Apostolic of Kengtung, Myanmar | Territory Added |
| 14 Mar | Diocese of Łomża, Poland (Kościół) | Territory Lost | Diocese of Siedlce, Poland | Territory Added |
| 15 Mar | Nunciature to Guatemala (to Nunciature) | Elevated | ||
| 21 Mar | Congregation of Mariannhill Missionaries | Approbation | ||
| 17 Apr | Archdiocese of Bamberg, Germany (Königsberg) | Territory Lost | Diocese of Würzburg, Germany | Territory Added |
| 2 May | Territorial Abbey of San Martino al Monte Cimino, Italy | Suppressed | Diocese of Viterbo e Tuscania, Italy | Territory Added |
| 25 May | Vicariate Apostolic of Isole della Piccola Sonda, Indonesia (Part of Timor (Dutch), islands of Boti, Savoie, Alor, and Pantar) | Territory Lost | Vicariate Apostolic of Timor Olandese, Indonesia | Erected |
| 25 May | Prefecture Apostolic of Broken Hill, Zambia (Barotseland (Balovale, Lealui, Senanga, Maneoya, Kalabo and Sesheke, along with Livingstone)) | Territory Lost | Prefecture Apostolic of Victoria Falls, Zambia | Erected |
| 25 May | Vicariate Apostolic of Laohokow [Laohekou], China (Siangyang, Tsaoyang, Jcheng, and Nanchang) | Territory Lost | Prefecture Apostolic of Siangyang [Xiangyang], China | Erected |
| 25 May | Vicariate Apostolic of Kasaď Superiore, Congo (Dem. Rep.) (Bátetelas (including Tshumbe, Lubefu, Lodja, and Kotato-Kombe)) | Territory Lost | Prefecture Apostolic of Tshumbe, Congo (Dem. Rep.) | Erected |
| 25 May | Mission "Sui Iuris" of Hainan [Hainan], China | Elevated | Prefecture Apostolic of Hainan [Hainan], China | Elevated |
| 25 May | Vicariate Apostolic of Luanfu, China (Kiangehow (Sinkien), Yuankü, Wensi, Tsishan, Eotsin, Küwo, Fencheng, Siangning, Kishien, Yicheng, Ishih, Wanchiian, Yungho, Juieheng, Yüsiang, lÂntsin, Y anointed. Pinglu, Hiashien, Anyishien, Siehshien, and Kiangshien) | Territory Lost | Prefecture Apostolic of Xinjiang [Kiangchow], China | Erected |
| 3 Jun | Prefecture Apostolic of San Gabriel de la Dolorosa del Marańón, Peru | Elevated | Vicariate Apostolic of San Gabriel de la Dolorosa del Marańón, Peru | Elevated |
| 6 Jun | Diocese of Nueva Segovia, Philippines (Langanan, Zimigiii, Cayapa, and area near river Malig) | Territory Lost | Diocese of Tuguegarao, Philippines | Territory Added |
| 6 Jun | Archdiocese of Paderborn, Germany (Gennebreck) | Territory Lost | Archdiocese of Köln {Cologne}, Germany | Territory Added |
| 2 Jul | Diocese of Jaro o Santa Elisabetta, Philippines (Maestre de Campo)
Diocese of Lipa, Philippines (Lubang, islands located in front of Calapan, Bacň, and Puerto Galera; island of Apo; islands of Hin, Remirara, Sibay, and Caluyo, islands of Masin, Tambazon, and Buyallao) | Territory Lost | Prefecture Apostolic of Mindoro, Philippines | Erected |
| 7 Jul | Vicariate Apostolic of Ichang [Yichang], China (Kien-ling Shichow, Kung-An, Sung-Tse, and part of Kiang-lin) | Territory Lost | Prefecture Apostolic of Shashi [Shasi], China | Erected |
| 7 Jul | Vicariate Apostolic of Weihweifu, China | Territory Lost | Prefecture Apostolic of Xinxiang [Sinsiang], China | Erected |
| 11 Jul | Diocese of Los Angeles-San Diego, California, USA (Imperial, Riverside, San Bernardino, and San Diego Counties) | Territory Lost | Diocese of San Diego, California, USA | Erected |
| 11 Jul | Diocese of Los Angeles-San Diego, California, USA | Elevated | Archdiocese of Los Angeles, California, USA | Elevated |
| 11 Jul | Diocese of Monterey-Fresno, California, USA (from San Francisco) | Metropolitan Changed | ||
| 11 Jul | Diocese of Tucson, Arizona, USA (from Santa Fe to Los Angeles) | Metropolitan Changed | ||
| 1 Aug | Apostolic Administration of Upper Gazireh (Gezira) (Chaldean), Turkey | Erected | ||
| 24 Oct | Archdiocese of Santiago de Chile (Pasqua island) | Territory Lost | Vicariate Apostolic of Araucanía, Chile | Territory Added |
| 28 Nov | Archdiocese of Kraków {Cracow}, Poland (Ispina and Krzykowka) | Territory Lost | Diocese of Tarnów, Poland | Territory Added |
| 17 Dec | Diocese of Lahore, Pakistan (Dera Ghazi Khan with Buoch Trans Frontier, Muzaffargarth, Jhang, Multan, Montgomery, Lyalpur, Dera Ismail Khan, along with Bhajákar and Bahawalpur) | Territory Lost | Prefecture Apostolic of Multan, Pakistan | Erected |
| 19 Dec | Diocese of Lublin, Poland (Krame) | Territory Lost | Diocese of Siedlce, Poland | Territory Added |
| 19 Dec | Diocese of Regensburg, Germany (Forstwiesen) | Territory Lost | Diocese of Augsburg, Germany | Territory Added |
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