| Date | From | To | ||
|---|---|---|---|---|
| unknown | Mission "Sui Iuris" of I-li o Kul-Dia, China | Suppressed | ||
| unknown | Nunciature to El Salvador | Established | ||
| 10 Feb | Archdiocese of São Luís do Maranhão, Brazil (Sancta Cruz da Borra do Gorda, San Pedro de Alcantara de Carolina, N. Senhor do Bomfim de Grajahu, S. Thereza de Imperatriz e Porto Franco, and S. Francisco Xavier de Turyassu) | Territory Lost | Territorial Prelature of São José do Grajaú, Brazil | Erected |
| 10 Feb | Archdiocese of São Luís do Maranhão, Brazil (Became a Metropolitan) | Elevated | ||
| 10 Feb | Diocese of Piaui, Brazil (from Belém do Pará) | Metropolitan Changed | ||
| 10 Feb | Territorial Prelature of Bom Jesus do Piauí, Piaui, Brazil (from Belém do Pará) | Metropolitan Changed | ||
| 16 Feb | Vicariate Apostolic of Kuiceu (Kweichow), China (Panhien, Pougan, Ganlan, Hinjen, Hiny, Tchenfong, Lanlong, Tsehen, and Loufou along with Matchang, Nicoutchang, Tchehiang (in Kouanlin) and Potang, Hohon, Yangkia, and Cheten (in Tseyuin))
Vicariate Apostolic of Kuamsi, China (Liniun, Silong, and Silin) | Territory Lost | Prefecture Apostolic of Lanlung [Anlong], China | Erected |
| 17 Feb | Archdiocese of Albi, France | Name Changed | Archdiocese of Albi (-Castres-Lavaur), France | Name Changed |
| 18 Feb | Prefecture Apostolic of Niigata, Japan (Fukui, Ishikawa, and Toyama)
Archdiocese of Tōkyō, Japan (Aichi and Gifu) | Territory Lost | Prefecture Apostolic of Nagoya, Japan | Erected |
| 20 Feb | Vicariate Apostolic of Zanzibar, Kenya | Territory Lost | Vicariate Apostolic of Kenya, Kenya (Boundaries adjusted) | Territory Added |
| 3 Mar | Vicariate Apostolic of Dar-es-Salaam, Tanzania (Ugogo and Uhehe) | Territory Lost | Prefecture Apostolic of Iringa, Tanzania | Erected |
| 3 Mar | Diocese of Amazonas, Brazil (S. Rita de Moura) | Territory Lost | Territorial Prelature of Rio Negro, Amazonas, Brazil | Territory Added |
| 4 Mar | Diocese of Guayana, Venezuela | Territory Lost | Vicariate Apostolic of Caroní, Venezuela | Erected |
| 7 Mar | Diocese of Hajdúdorog (Hungarian), Hungary
Eparchy of Mukachevo (Munkács) (Ruthenian), Ukraine Eparchy of Stanislaviv (Ukrainian), Ukraine | Territory Lost | Apostolic Administration of Târgul-Siret (Ruthenian), Romania | Erected |
| 8 Mar | Vicariate Apostolic of Northern Kansu {Kansu Settentrionale}, China
Vicariate Apostolic of Southern Kansu {Kansu Meridionale}, China | Territory Lost | Vicariate Apostolic of Western Kansu {Kansu Occidentale}, China (Chinese Turkestan, Ngàn-su-tao, Kaiì-leang-tao, Sining-tao, Lanchan-tao, Kukunoor, and the Mongolian territory of Alachan)
Vicariate Apostolic of Eastern Kansu {Kansu Orientale}, China (Wei-tchoan-tao and King-yuen-tao) | Erected |
| 12 Mar | Prefecture Apostolic of Isole della Piccola Sonda, Indonesia | Elevated | Vicariate Apostolic of Isole della Piccola Sonda, Indonesia | Elevated |
| 14 Mar | Vicariate Apostolic of Southwestern Mongolia {Mongolia Occiduo-Meridionale}, China (Ning-hiatao and Ning-tiao-leang along with Otok, Wuchen, Tjassak, Hang-King (in the Mongol principality) and the Chinese colonies situated on the left bank of the Yellow River, up to the colonies of Wu-yuen-hien inclusive) | Territory Lost | Vicariate Apostolic of Ninghsia, China | Erected |
| 14 Mar | Vicariate Apostolic of Southwestern Mongolia {Mongolia Occiduo-Meridionale}, China
Vicariate Apostolic of Central Mongolia {Mongolia Centrale}, China (Souei-yuen) | Name Changed | Vicariate Apostolic of Suiyüan [Hohot], China | Name Changed |
| 14 Mar | Vicariate Apostolic of Central Mongolia {Mongolia Centrale}, China (Northern part) | Territory Lost | Mission "Sui Iuris" of Outer Mongolia, Mongolia | Erected |
| 14 Mar | Vicariate Apostolic of Northern Shansi {Scian-Si Settentrionale}, China (Tatung-fu, Jang-kao, Tienchen, Hunyuan, Kwangling, and Lingkin) | Territory Lost | Prefecture Apostolic of Tatungfu, China | Erected |
| 14 Mar | Vicariate Apostolic of Central Mongolia {Mongolia Centrale}, China (Region of Tchagar) | Name Changed | Vicariate Apostolic of Tchagar, China | Name Changed |
| 19 Mar | Vicariate Apostolic of Northern Manchuria {Manciuria Settentrionale}, China (Yenki and Ilam) | Territory Lost | Vicariate Apostolic of Wonsan, Korea (North) | Territory Added |
| 6 Apr | Diocese of Regensburg, Germany (Ereiung, Zaining, and Voeglsberg) | Territory Lost | Diocese of Passau, Germany | Territory Added |
| 20 Apr | Diocese of Bragança e Miranda, Portugal (19 parishes)
Archdiocese of Braga, Portugal (166 parishes) Diocese of Lamego, Portugal (71 parishes) | Territory Lost | Diocese of Vila Real, Portugal (Province of Vila Real) | Erected |
| 25 Apr | Vicariate Apostolic of Urundi and Kivu, Burundi | Territory Lost | Vicariate Apostolic of Ruanda | Erected |
| 25 Apr | Vicariate Apostolic of Urundi and Kivu, Burundi | Name Changed | Vicariate Apostolic of Urundi, Burundi | Name Changed |
| 29 Apr | Archdiocese of Lviv, Ukraine (Uryez) | Territory Lost | Diocese of Przemyśl, Poland | Territory Added |
| 1 May | Vicariate Apostolic of Kiangsu, China | Name Changed | Vicariate Apostolic of Nanking [Nanjing], China | Name Changed |
| 5 May | Diocese of Rimouski (St. Germain of), Québec, Canada (Gaspé and Bonaventure (except Assemetquagan, Restigouche, Milnikek, Matapédia, and Patapedia)) | Territory Lost | Diocese of Gaspé, Québec, Canada | Erected |
| 9 May | Broeders van de H. Aloysius Gonzaga | Decretum Laudis | ||
| 15 May | Diocese of Kielce, Poland (Rudnik Wielki) | Territory Lost | Diocese of Włocławek (Kujawy, Kalisze), Poland | Territory Added |
| 18 May | Diocese of Győr (Raab), Hungary
Diocese of Szombathely, Hungary | Territory Lost | Apostolic Administration of Burgenland, Austria | Erected |
| 29 May | Archdiocese of Esztergom, Hungary | Territory Lost | Apostolic Administration of Trnava (Tirnava), Slovakia | Erected |
| 29 May | Diocese of Marsi, Italy (Tramútola) | Territory Lost | Territorial Abbey of Santissima Trinità di Cava de’ Tirreni, Italy | Territory Added |
| 1 Jun | Diocese of Monterey-Los Angeles, California, USA (Santa Clara) | Territory Lost | Archdiocese of San Francisco, California, USA | Territory Added |
| 1 Jun | Diocese of Monterey-Los Angeles, California, USA | Split | Diocese of Los Angeles-San Diego, California, USA (Southern part: Imperial, Los Angeles, Orange, Riverside, San Bernardino, San Diego, Santa Barbara, and Ventura)
Diocese of Monterey-Fresno, California, USA (Northern part: Fresno, Inyo, Kern, Kings, Madera, Mariposa, Merced, Monterey, San Benito, San Luis Obispo, Santa Cruz, and Tulare) | Split |
| 7 Jun | Diocese of Košice, Slovakia (Jaszó-Ujfalu, Lelesz, and Kiralyhelniec)
Diocese of Rožňava, Slovakia (Jaszó (abbey and city), Débròd, Rudnok, Felso-Mecenzéf, and Jaszó-Mindszent) Diocese of Satu Mare {Szatmár}, Romania (Nagy-Kapos) | Territory Lost | Territorial Abbey of Jasov (Jászó), Slovakia | Erected |
| 9 Jun | Archdiocese of Linares o Nueva León, Nuevo León, México | Name Changed | Archdiocese of Monterrey, Nuevo León, México | Name Changed |
| 12 Jun | Diocese of Cleveland, Ohio, USA (Erie, Huron, and Bichland) | Territory Lost | Diocese of Toledo (in America), Ohio, USA | Territory Added |
| 14 Jun | Vicariate Apostolic of Upper French Congo {Congo Francese Superiore} o Ubanghi, Congo | Name Changed | Vicariate Apostolic of Brazzaville, Congo | Name Changed |
| 27 Jun | Vicariate Apostolic of Stanley Falls, Congo (Dem. Rep.)
Vicariate Apostolic of Uganda (West of Lake Albert attached to Belgian government) | Territory Lost | Prefecture Apostolic of Lac Albert, Congo (Dem. Rep.) | Erected |
| 4 Jul | Diocese of Münster, Germany (Part of Rennekoven) | Territory Lost | Archdiocese of Köln {Cologne}, Germany | Territory Added |
| 18 Jul | Vicariate Apostolic of Kasaï Superiore, Congo (Dem. Rep.) (Lulua and Bec)
Prefecture Apostolic of Katanga, Congo (Dem. Rep.) (Northern part) | Territory Lost | Prefecture Apostolic of Lulua e Katanga Centrale, Congo (Dem. Rep.) | Erected |
| 11 Aug | Delegation to China | Established | ||
| 12 Oct | Diocese of Barquisimeto, Venezuela (Civil state of Falcón) | Territory Lost | Diocese of Coro, Venezuela | Erected |
| 12 Oct | Diocese of Guayana, Venezuela (Civil states of Sucre and Nueva Esparta) | Territory Lost | Diocese of Cumaná, Venezuela | Erected |
| 12 Oct | Archdiocese of Caracas, Santiago de Venezuela (Civil states of Carabobo and Jaracuy) | Territory Lost | Diocese of Valencia en Venezuela | Erected |
| 12 Oct | Diocese of Mérida, Venezuela (Civil state of Tachira and part of Apure (Paez)) | Territory Lost | Diocese of San Cristóbal de Venezuela | Erected |
| 30 Oct | Diocese of Janów Podlaski (Podlaska o Janów), Poland (Krasne) | Territory Lost | Diocese of Lublin, Poland | Territory Added |
| 14 Nov | Vicariate Apostolic of New Guinea | Name Changed | Vicariate Apostolic of Papua, Papua New Guinea | Name Changed |
| 14 Nov | Vicariate Apostolic of New Pomerania, Papua New Guinea | Name Changed | Vicariate Apostolic of Rabaul, Papua New Guinea | Name Changed |
| 14 Nov | Prefecture Apostolic of Western Kaiser-Wilhelms-Land, Papua New Guinea | Name Changed | Prefecture Apostolic of Central New Guinea | Name Changed |
| 18 Nov | Territorial Abbey of Saint Peter-Muenster, Saskatchewan, Canada (from Immediately Subject) | Metropolitan Changed | ||
| 23 Nov | Prefecture Apostolic of Eastern Kaiser-Wilhelms-Land, Papua New Guinea | Elevated | Vicariate Apostolic of Eastern New Guinea | Elevated |
| 24 Nov | Diocese of Ciudad Victoria-Tamaulipas, Tamaulipas, México (Tantoyuca and Tempoal)
Diocese of San Luis Potosí, México (Tamazuncdle, San Martin Ghalchicuantla, and Jilitla) Diocese of Tulancingo, Hidalgo, México (Huejutla, Platon Sánchez, San Felipe Orizatlan, Goacuilco, Yahualica, Huatzalingo, Tlanchinol, Pisaflores, Chapulhuacan, Tepehuacan, Ganali, Zolotla, Xochicoatlan, Huatla, Chicoutepec, Xochiatipan, Ylamatlan, Zontecomatlan, Ixhuatlan, Metlaltoyuca, ...) | Territory Lost | Diocese of Huejutla, Hidalgo, México | Erected |
| 24 Nov | Diocese of Tulancingo, Hidalgo, México (Ozuluama, Tantima, Tamalin, Citlaltepec, Chouila, and Ixeatepec)
Diocese of Veracruz-Jalapa, México (Northern region) | Territory Lost | Diocese of Papantla, Puebla, México | Erected |
| 27 Nov | Vicariate Apostolic of Tahiti {Isole Tahiti}, French Polynesia, Pacific (Oceania) (Cook and Manihiki) | Territory Lost | Prefecture Apostolic of Cook e Manihiki, Cook Islands, Pacific (Oceania) | Erected |
| 4 Dec | Diocese of Niterói (Nictheroy), Brazil | Territory Lost | Diocese of Barra do Piraí, Brazil | Erected |
| 4 Dec | Diocese of Niterói (Nictheroy), Brazil | Territory Lost | Diocese of Campos, Rio de Janeiro, Brazil | Erected |
| 7 Dec | Delegation to Southern Africa (Cape, Orange, Natal, and Transvaal along with Basutoland and Bechuanaland) | Established | ||
| 17 Dec | Diocese of Wrocław (Breslau), Poland | Territory Lost | Apostolic Administration of Upper Silesia {Górny Sląsk}, Poland | Erected |
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