| Date | From | To |
|---|
| unknown | Apostolic Administration of Srpski Banat, Serbia
| Name Changed | Apostolic Administration of Jugoslavenska Banat, Serbia
| Name Changed |
| 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 Bùi 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 Kasaï 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 Marañón, Peru
| Elevated | Vicariate Apostolic of San Gabriel de la Dolorosa del Marañón, 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, Bacò, 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 |