| Date | From | To | ||
|---|---|---|---|---|
| 8 Jan | Diocese of Trichinopoly, India (Tinnevelly, part of Travancore (East of the Ghats), and Ramnad and Madura (except Paini and Dindigul)) | Territory Lost | Diocese of Madura, India | Erected |
| 8 Jan | Vicariate Apostolic of Fianarantsoa, Madagascar (part of Bakalavia)
Vicariate Apostolic of Majunga, Madagascar (part of Maintirano and Morafenobe) Vicariate Apostolic of Tananarive, Madagascar (part of Maintirano and Morafenobe) | Territory Lost | Prefecture Apostolic of Morondava, Madagascar | Erected |
| 8 Jan | Vicariate Apostolic of Fianarantsoa, Madagascar
Vicariate Apostolic of Majunga, Madagascar Vicariate Apostolic of Tananarive, Madagascar | Territory Lost | Vicariate Apostolic of Antsirabé, Madagascar | Erected |
| 8 Jan | Prefecture Apostolic of Broken Hill, Zambia (Kasempa, Solwezi, and Mwinilunga) | Territory Lost | Prefecture Apostolic of Ndola, Zambia | Erected |
| 8 Jan | Vicariate Apostolic of Saigon, Viet Nam (Bến Tre, Trŕ Vinh, Vinh Long, and part of Đồng Tháp (Sa Đéc)) | Territory Lost | Vicariate Apostolic of Vinh Long, Viet Nam | Erected |
| 8 Jan | Mission "Sui Iuris" of Kienow [Jian’ou], China | Elevated | Prefecture Apostolic of Jian’ou [Kienow, Kienning], China | Elevated |
| 29 Jan | Diocese of Trento, Italy (Vent) | Territory Lost | Apostolic Administration of Innsbruck, Austria | Territory Added |
| 9 Feb | Mission "Sui Iuris" of Beni nel Congo Belga {Belgian Congo} | Elevated | Vicariate Apostolic of Beni nel Congo Belga {Belgian Congo} | Elevated |
| 9 Feb | Vicariate Apostolic of Suifu [Yibin], China (Loshan (Kiating)) | Territory Lost | Vicariate Apostolic of Yachow, China | Territory Added |
| 9 Feb | Prefecture Apostolic of Wuchow [Wuzhou], China (Kweilin, Ghuanchow, Kuanyang, Rsingugan, Lungsheng, Lingchuan, Yining, Peshou or Kuhwa, Yungfu, Ydngso, Lipo, Pinglo, Kungeheng, Fuchuan, Vhungshan, Fluhnsien, along with Kwangsi) | Territory Lost | Prefecture Apostolic of Guilin [Kweilin], China | Erected |
| 9 Feb | Mission "Sui Iuris" of Weihaiwei [Weihai], China | Elevated | Prefecture Apostolic of Weihai [Weihaiwei], China | Elevated |
| 9 Feb | Vicariate Apostolic of Moukden, China (Chinchow along with Chin-Hsien, Kin-Si, Hing-Ch'eng, Sui-Chung, and I-Hsien) | Territory Lost | Vicariate Apostolic of Jehol [Jinzhou], China | Territory Added |
| 9 Feb | Vicariate Apostolic of Yachow, China | Name Changed | Vicariate Apostolic of Kiating [Leshan], China | Name Changed |
| 20 Feb | Diocese of Montefeltro, Italy (Paderno) | Territory Lost | Diocese of Sarsina, Italy | Territory Added |
| 26 Feb | Archdiocese of Detroit, Michigan, USA (Huron, Tuscola, and Sanilac)
Diocese of Grand Rapids, Michigan, USA (Saginaw, Gratiot, Midland, Bay, Gladwin, Arenac, Ogemaw, Iosco, Oscoda, Alcona, Montmorency, Alpena, and Presque Isle) | Territory Lost | Diocese of Saginaw, Michigan, USA | Erected |
| 26 Feb | Archdiocese of Detroit, Michigan, USA (Genesee, Livingston, and Shiawassee) | Territory Lost | Diocese of Lansing, Michigan, USA | Territory Added |
| 26 Feb | Diocese of Lansing, Michigan, USA (Allegan, Barry, and Ionia) | Territory Lost | Diocese of Grand Rapids, Michigan, USA | Territory Added |
| 13 Mar | Diocese of Chatham, New Brunswick, Canada | Name Changed | Diocese of Bathurst in Canada, New Brunswick | Name Changed |
| 13 Mar | Prefecture Apostolic of Calabar, Nigeria | Territory Lost | Prefecture Apostolic of Ogoja, Nigeria | Erected |
| 29 Mar | Vicariate Apostolic of Papua, Papua New Guinea (Parts in the State of Queensland)
Diocese of Victoria-Palmerston, Australia | Name Changed | Diocese of Darwin, Australia | Name Changed |
| 29 Mar | Mission "Sui Iuris" of Tukuyu, Tanzania | Elevated | Prefecture Apostolic of Tukuyu, Tanzania | Elevated |
| 29 Mar | Mission "Sui Iuris" of Queenstown, South Africa | Elevated | Prefecture Apostolic of Queenstown, South Africa | Elevated |
| 30 Mar | Apostolic Administration of Valdivia, Chile (Freiré) | Territory Lost | Vicariate Apostolic of Araucanía, Chile | Territory Added |
| 9 Apr | Diocese of Augsburg, Germany (Faistenberg and Hohenleiten) | Territory Lost | Archdiocese of München und Freising {Munich}, Germany | Territory Added |
| 9 Apr | Diocese of Passau, Germany (Lands belonging to the Schmid and Scham families (in Aresing); and Estates of Gasberg and Stöffling) | Territory Lost | Archdiocese of München und Freising {Munich}, Germany | Territory Added |
| 7 May | Archdiocese of Fortaleza, Ceara, Brazil (Limoeiro, Aracati, Areěas, Jaguario e Mirini, Morada Nova, Pereiro, Riacho do Sangue, Săo Bernardo das Russas, and Uniăo) | Territory Lost | Diocese of Limoeiro do Norte, Ceara, Brazil | Erected |
| 21 May | Vicariate Apostolic of Dutch Borneo {Borneo Olandese}, Indonesia (South-Eastern province of Borneo (Residentie Zuider en Oosterafdeeling)) | Territory Lost | Prefecture Apostolic of Bandjarmasin, Indonesia | Erected |
| 21 May | Vicariate Apostolic of Dutch Borneo {Borneo Olandese}, Indonesia | Name Changed | Vicariate Apostolic of Pontianak, Indonesia | Name Changed |
| 21 May | Mission "Sui Iuris" of Karafuto, Japan | Elevated | Prefecture Apostolic of Karafuto, Russian Federation | Elevated |
| 21 May | Mission "Sui Iuris" of Sinkiang [Xinjiang-Urumqi], China | Elevated | Prefecture Apostolic of Xinjiang-Urumqi [Sinkiang], China | Elevated |
| 21 May | Mission "Sui Iuris" of Shaowu [Shaowu], China | Elevated | Prefecture Apostolic of Shaowu [Shaowu], China | Elevated |
| 3 Jun | Prefecture Apostolic of Lingling [Yungchow], China (Chaoyang, Sirihwa, Wujcang, Finning, Chengpu, Suining, Tsingchow, Plweitung, and Tungtao) | Territory Lost | Prefecture Apostolic of Baojing [Paoking, Shaoyang], China | Erected |
| 3 Jun | Missionaries of the Sacred Heart and Saint Mary of Guadalupe | Founded | ||
| 4 Jun | Diocese of Larino, Italy (Tremiti islands) | Territory Lost | Archdiocese of Manfredonia (e Vieste), Italy | Territory Added |
| 14 Jun | Prefecture Apostolic of Isole di Mayotta, Nossi-Bé e Comore, Madagascar | Name Changed | Prefecture Apostolic of Ambanja, Madagascar | Name Changed |
| 14 Jun | Vicariate Apostolic of Togo | Name Changed | Vicariate Apostolic of Lomé, Togo | Name Changed |
| 14 Jun | Vicariate Apostolic of Ichang [Yichang], China | Territory Lost | Vicariate Apostolic of Shihnan [Enshi], China | Erected |
| 14 Jun | Vicariate Apostolic of Laos (Vientiane, Xieng-Khuang (or Tran-Ninh), Luang-Prabang, Huei-Sai (or Eaut-Melcong), and the Fifth Military Territory or Phong-Sali) | Territory Lost | Prefecture Apostolic of Vientiane e Luang-Prabang, Laos | Erected |
| 21 Jun | Franciscan Brothers of the Third Order Regular, Mountbellow | Approbation | ||
| 13 Jul | Vicariate Apostolic of Eshowe, South Africa (Tongaland)
Prefecture Apostolic of Lydenburg, South Africa (Piet Retief) | Territory Lost | Prefecture Apostolic of Swaziland | Territory Added |
| 30 Jul | Archdiocese of Benevento, Italy (Cryptaestanea of S. Aegidius Abbots) | Territory Lost | Diocese of Avellino, Italy | Territory Added |
| 30 Jul | Diocese of Avellino, Italy (Blessed Virgin Mary of Sorrows (in Pratula)) | Territory Lost | Archdiocese of Benevento, Italy | Territory Added |
| 4 Aug | Mission "Sui Iuris" of Kodok, Sudan | Elevated | Prefecture Apostolic of Kodok, Sudan | Elevated |
| 10 Aug | Delegation to Antilles | Territory Lost | Nunciature to Cuba (Jamaica with its annexed territories and British Honduras)
Nunciature to Haiti (Rest of the Lesser Antilles and Puerto Rico) Nunciature to Venezuela (Barbados and the islands of Venezuela) | Territory Added |
| 24 Aug | Diocese of Coimbra, Portugal (Águeda, Anadia, Aveiro, Ílhavo, Oliveira do Bairrom, and Vagos)
Diocese of Porto, Portugal (Albergaria-a-Velha, Estarreja, and Murtosa) Diocese of Viseu, Portugal (Sever do Vouga) | Territory Lost | Diocese of Aveiro, Portugal | Restored |
| 22 Oct | Diocese of Cittŕ di Castello, Italy (Adjusted boundaries to match civil boundaries)
Diocese of Sansepolcro (Borgo San Sepolcro), Italy (Adjusted boundaries to match civil boundaries) | Territory Added | ||
| 21 Nov | Delegation to Great Britain | Established | ||
| 3 Dec | Diocese of Haileybury, Ontario, Canada (Southern part) | Territory Lost | Diocese of Amos, Québec, Canada | Erected |
| 3 Dec | Diocese of Haileybury, Ontario, Canada (Northern part)
Vicariate Apostolic of Northern Ontario (Ontario-Nord), Canada | Territory Lost | Vicariate Apostolic of Baie de James {James Bay}, Ontario, Canada | Erected |
| 3 Dec | Diocese of Haileybury, Ontario, Canada
Vicariate Apostolic of Northern Ontario (Ontario-Nord), Canada | Elevated | Diocese of Hearst, Ontario, Canada (Name Changed and Vicariate raised to a Diocese) | Elevated |
| 3 Dec | Diocese of Haileybury, Ontario, Canada (St. Maurice and La Violette) | Territory Lost | Diocese of Trois-Rivičres, Québec, Canada | Territory Added |
| 10 Dec | Diocese of Haileybury, Ontario, Canada | Name Changed | Diocese of Timmins, Ontario, Canada | Name Changed |
| 13 Dec | Prefecture Apostolic of Kienchangfu, China | Elevated | Vicariate Apostolic of Nancheng [Nancheng], China | Elevated |
| 13 Dec | Vicariate Apostolic of Lisala, Congo (Dem. Rep.) (Boundaries Adjusted)
Vicariate Apostolic of Oubangui Chari, Central African Republic (Boundaries Adjusted) | Territory Added | ||
| 13 Dec | Diocese of Lahore, Pakistan (Shahpur and Gujrat along with Pind-Dadan-Khan) | Territory Lost | Prefecture Apostolic of Kafiristan e Kashmir, Pakistan | Territory Added |
| 17 Dec | Archdiocese of Eger, Hungary (Józsa, Szovŕt, Tetétlen, Földes, and Sap) | Territory Lost | Apostolic Administration of Debreczen, Hungary | Territory Added |
| 17 Dec | Archdiocese of Eger, Hungary (Tiszaherecseny, Tiszaadony Tiszavid, Tiszaszalka, and Kŕntorjŕnos) | Territory Lost | Apostolic Administration of Mérk, Hungary | Territory Added |
| 17 Dec | Apostolic Administration of Mérk, Hungary (Zŕhonij Ilk and Nyirvasvári) | Territory Lost | Archdiocese of Eger, Hungary | Territory Added |
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