| Date | From | To | ||
|---|---|---|---|---|
| unknown | Frères Joséphites | Founded | ||
| 12 Jan | Diocese of Luni, Sarzana e Brugnato, Italy | Name Changed | Diocese of Luni o La Spezia, Sarzana e Brugnato, Italy | Name Changed |
| 25 Jan | Diocese of São Carlos do Pinhal, Brazil (Jaboticabal, Barretos, Bebedouro, Pitangueiras, Viradouro, Monte Alto, Monte Azul, Tayassù, Tayuva, Olympia, Collina, Cajoby, Irupy, Piranjy, Guaracy, and Severino) | Territory Lost | Diocese of Jaboticabal, Sao Paulo, Brazil | Erected |
| 25 Jan | Diocese of São Carlos do Pinhal, Brazil (Rio Preto, Ibirá, Santa Adélia, Tabapuã, Mirassol, Nova Granada, Monte Aprazível, Tanabi, Ariranha, Catanduva, Potirendaba, Inácio Uchoa, Cedral, José Bonifácio, and Fernando Prestes) | Territory Lost | Diocese of Rio Preto, Sao Paulo, Brazil | Erected |
| 25 Jan | Archdiocese of Beirut {Bairut} (Armenian), Lebanon | Erected | ||
| 8 Feb | Vicariate Apostolic of Siwantze [Chongli-Xiwanzi], China (Feng-cJieng, Leang-TcJieng, Kining, and Tao4in) | Territory Lost | Vicariate Apostolic of Tsining [Jining], China | Erected |
| 8 Feb | Vicariate Apostolic of Brazzaville, Congo (Haute Sangha) | Territory Lost | Prefecture Apostolic of Oubangui Chari, Central African Republic | Territory Added |
| 15 Feb | Archdiocese of Calcutta, India (Remaining part of Sikkim)
Vicariate Apostolic of Tatsienlu, China (English Bhutan (Kalimpong) and part of Sikkim) | Territory Lost | Mission "Sui Iuris" of Sikkim, India | Erected |
| 20 Feb | Vicariate Apostolic of Cape of Good Hope, Eastern District {Capo de Buona Speranza, Distretto Orientale}, South Africa (Queenstown, Cathcart, Stutterheim, Tarka, Hofmeyr, Glen Grey, Stockenström, Maraisburg, and part of St Mark’s) | Territory Lost | Mission "Sui Iuris" of Queenstown, South Africa | Erected |
| 20 Feb | Vicariate Apostolic of Swatow [Shantou], China (Kaying, Taipu, Pingyun, Hingning, Lungchun, Chenping, Hoping, Linping, and Chongloh (except Chong-San)) | Territory Lost | Prefecture Apostolic of Kaying [Meixian], China | Erected |
| 21 Feb | Vicariate Apostolic of Wuhu [Wuhu], China (Anhing, Hohfei, Hwoshan, Kweichich, Linan, Lukiang, Shucheng, Susung, Taihu, Tungcheng, Tungliu, Tsienshan, Tsiupu, Wanglciang, and Yingshan) | Territory Lost | Vicariate Apostolic of Anking [Anqing], China | Erected |
| 21 Feb | Vicariate Apostolic of Wuhu [Wuhu], China (Chuantsiao, Chuchow, Chuy i Fengtai, Fengyang, Hwaiynan, HwoMu, Kwoyang, Laian, Lingpi, Mengchen, Fochow, Sowchow, Buchow, Szechow, Taiho, Tienchang, Tingyuan, Wuho, Yingchow, and Yingshang) | Territory Lost | Vicariate Apostolic of Pengpu [Bengbu], China | Erected |
| 1 Mar | Territorial Prelature of Porto Velho, Rondonia, Brazil
Diocese of São Luíz de Cáceres, Mato Grosso, Brazil | Territory Lost | Territorial Prelature of Guajará-Mirim, Rondonia, Brazil (Guaporé and Mamoré in Matto Grosso) | Erected |
| 1 Mar | Diocese of Montes Claros, Brazil
Diocese of Uberaba, Brazil | Territory Lost | Territorial Prelature of Paracatu, Brazil (Paracatu, João Pinheiro, and Sâo Româo (except Afonso Arinos)) | Erected |
| 11 Mar | Delegation to Egypt, Arabia, Eritrea and Ethiopia (Abyssiniae)
Nunciature to Syria (Palestine, TransJordan, and island of Cyprus) | Name Changed | Delegation to Egypt, Arabia, Eritrea, Ethiopia, Palestine, TransJordan, and Island of Cyprus | Name Changed |
| 17 Mar | Prefecture Apostolic of Hpyeng-yang, Korea (North) | Name Changed | Prefecture Apostolic of Peng-yang, Korea (North) | Name Changed |
| 18 Mar | Vicariate Apostolic of Chengtingfu [Zhengding], China (ChaosJiien, Ningtsing, Lungping, Paisiang, Lincheng, and Kaoyi) | Territory Lost | Prefecture Apostolic of Chaohsien [Zhaoxian], China | Erected |
| 21 Mar | Archdiocese of New York, New York, USA (Bahama islands) | Territory Lost | Prefecture Apostolic of Bahama, Bahamas, Antilles | Erected |
| 22 Mar | Archdiocese of Cuiabá, Mato Grosso, Brazil | Territory Lost | Territorial Prelature of Diamantino, Mato Grosso, Brazil | Erected |
| 30 Mar | Prefecture Apostolic of Sapporo, Japan | Elevated | Vicariate Apostolic of Sapporo, Japan | Elevated |
| 8 Apr | Vicariate Apostolic of Tabora, Tanzania (Part of Uha that is East and North of Malagarazi river)
Vicariate Apostolic of Urundi, Burundi (Bugufi) Vicariate Apostolic of Victoria-Nyanza, Tanzania (Civil province of Bukoba) | Territory Lost | Vicariate Apostolic of Bukoba, Tanzania | Erected |
| 10 Apr | Vicariate Apostolic of Victoria-Nyanza, Tanzania | Name Changed | Vicariate Apostolic of Mwanza, Tanzania | Name Changed |
| 15 Apr | Vicariate Apostolic of Pakhoi [Beihai], China (Island of Hainan) | Territory Lost | Mission "Sui Iuris" of Hainan [Hainan], China | Erected |
| 16 Apr | Vicariate Apostolic of Tsinanfu, China (Suimin, Loling, Yangsin, Eaifeng (or Wuti), Chanhwa, Pirihsien, Litsing, Tsingcheng, Putai, Tsitung, Changshan, Ewàntai, Tsowping, and Tzechwan) | Territory Lost | Mission "Sui Iuris" of Changtien, China | Erected |
| 25 Apr | Diocese of Bolivar, Ecuador (Macas) | Territory Lost | ||
| 1 May | Diocese of Paraguay (o Ssma Assunzione)
Prefecture Apostolic of Pilcomayo, Paraguay | Territory Lost | Diocese of Concepción y Chaco, Paraguay | Erected |
| 1 May | Diocese of Paraguay (o Ssma Assunzione) | Territory Lost | Diocese of Villarrica, Paraguay | Erected |
| 1 May | Diocese of Paraguay (o Ssma Assunzione) | Elevated | Archdiocese of Asunción, Paraguay | Elevated |
| 24 May | Vicariate Apostolic of Sienhsien [Xianxian] (Siensien), China (Weihsien, Tsingho, Kitseh, Kuchow, Yungnien, Feisiang, Kwangping, Chengan, Hantan, and Tzechow) | Territory Lost | Prefecture Apostolic of Yüngnien [Weixian], China | Erected |
| 24 May | Vicariate Apostolic of Zanzibar, Kenya (Oltre Giuba) | Territory Lost | Vicariate Apostolic of Mogadiscio, Somalia | Territory Added |
| 25 May | Vicariate Apostolic of Paotingfu, China (Yihsien, Laishui, and Kwangchang)
Vicariate Apostolic of Peking [Beijing], China (San Può) | Territory Lost | Mission "Sui Iuris" of Yihsien [Yixian], China | Erected |
| 25 May | Vicariate Apostolic of Chengchow [Zhengzhou], China (Kunghsien, Yenshihsien, Mengtsing, Loyang, Sinansien, MiencMh, Yungning, Yiyang, Sunghsien, Teng-feng, Nanyang, Schanchow, Lingyao, Wensiang, Lushi, Pingteng, and Tseyou) | Territory Lost | Prefecture Apostolic of Loyang [Luoyang], China | Erected |
| 26 May | Cardinal Titular Church of Santa Maria ad Martyres | Suppressed | ||
| 26 May | Cardinal Titular Church of Sant’Apollinare alle Terme Neroniane-Alessandrine | Established | ||
| 28 May | Archdiocese of Brisbane, Australia (Southern part of Queensland, south of the twenty-fifth degree of south latitude and west of the Auburn and great Dividing Ranges) | Territory Lost | Diocese of Toowoomba, Australia | Erected |
| 6 Jun | Prefecture Apostolic of Iceland {Islanda} | Elevated | Vicariate Apostolic of Iceland {Islanda} | Elevated |
| 7 Jun | Diocese of Płock, Poland (Rynia) | Territory Lost | Archdiocese of Warszawa {Warsaw}, Poland | Territory Added |
| 7 Jun | Archdiocese of Poznań, Poland (Orzechowo and Pieczkowo) | Territory Lost | Archdiocese of Gniezno, Poland | Territory Added |
| 14 Jun | Diocese of Trento, Italy | Elevated | Archdiocese of Trento, Italy (Without suffragans) | Elevated |
| 15 Jun | Société des Missions-Étrangères | Approbation | ||
| 21 Jun | Diocese of Goiás, Brazil (Spiritus Sancti in Jatahy, Spiritus Sancti in Mineiros, Spiritus Sancti in Mio Bonito and Our Lady of Sorrows in Rio Verde) | Territory Lost | Territorial Prelature of Jataí, Brazil | Erected |
| 24 Jun | Nunciature to Italy | Established | ||
| 25 Jun | Diocese of Cap-Haïtien, Haïti (Hinche, Maissade, Marmelade, and St. Michel)
Archdiocese of Port-au-Prince, Haïti (Thomond) | Territory Lost | Diocese of Les Gonaïves, Haïti (Entire civil province of Artibonite) | Territory Added |
| 28 Jun | Archdiocese of Québec, Canada (Blier) | Territory Lost | Diocese of Rimouski (St. Germain of), Québec, Canada | Territory Added |
| 3 Jul | Diocese of Kumbakonam, India (Mayavaram, Shiyaly, and part of Nannuam and Ghidambaram (Thanjavur))
Archdiocese of Madras, India (Part of city of Madras) Diocese of Trichinopoly, India (Alangudi and Thirumayam) | Territory Lost | Diocese of São Tomé of Meliapore, India | Territory Added |
| 3 Jul | Diocese of São Tomé of Meliapore, India (Awor, Cooumim, Dindigul, Madura, Malleiadipaty, Oriur, HFossa Senhora das Dores, and Muttupettaah (except for Venkatakulam)) | Territory Lost | Diocese of Trichinopoly, India | Territory Added |
| 3 Jul | Diocese of São Tomé of Meliapore, India (Gur dalle, M anapal, Punnakail, Nossa Senhora des Dores de Tuticorin, and Vaipar) | Territory Lost | Diocese of Tuticorin, India | Territory Added |
| 3 Jul | Diocese of São Tomé of Meliapore, India (Boitakana, Bändel, and Ginsutah) | Territory Lost | Archdiocese of Calcutta, India | Territory Added |
| 3 Jul | Diocese of São Tomé of Meliapore, India (Nossa Senhora da Piedade in the city of Daccha, Hashnabad, Tesgonge, and Nagory) | Territory Lost | Diocese of Dacca, Bangladesh | Territory Added |
| 3 Jul | Diocese of São Tomé of Meliapore, India (Shibpur) | Territory Lost | Diocese of Chittagong, Bangladesh | Territory Added |
| 3 Jul | Diocese of São Tomé of Meliapore, India (Assumpçao, Goraçao de Jesus, S. Joâo, Befugio, and Rayapuram) | Territory Lost | Archdiocese of Madras, India | Territory Added |
| 10 Jul | Vicariate Apostolic of Suifu [Yibin], China (Tachow, Mingshan, PuMañg, Tanning, Hungya, KiaMang, Omei, Opien, YungMng, and Lushan) | Territory Lost | Prefecture Apostolic of Yachow, China | Erected |
| 13 Jul | Prefecture Apostolic of Lihsien, China | Elevated | Vicariate Apostolic of Ankwo [Anguo], China | Elevated |
| 13 Jul | Paulist Fathers | Decretum Laudis | ||
| 17 Jul | Apostolic Administration of Debreczen, Hungary | Erected | ||
| 17 Jul | Apostolic Administration of Mérk, Hungary | Erected | ||
| 18 Jul | Vicariate Apostolic of Western Nigeria {Nigeria Occidentale} (Area north of the rivers Niger and Benoue)
Prefecture Apostolic of Eastern Nigeria {Nigeria Orientale} | Name Changed | Prefecture Apostolic of Northern Nigeria {Nigeria Settentrionale} | Name Changed |
| 18 Jul | Vicariate Apostolic of Foochow [Fuzhou], China (Siiaowu, Kwangteseh, and Tainingi Kienning) | Territory Lost | Mission "Sui Iuris" of Shaowu [Shaowu], China | Erected |
| 18 Jul | Vicariate Apostolic of Hankow [Hankou], China (Hwangchow, Kishui, Kichow, Hwangtsi, Hwangmei, Lotien, Macheng, and Hwangan) | Territory Lost | Mission "Sui Iuris" of Hwangchow, China | Erected |
| 2 Aug | Vicariate Apostolic of Chengtu [Chengdu], China (ShunMng, Sichong, Pengchow, Yinshan, Yochih, Linshui, Kwangan, Shehung, PongJcy, Suining, Lochih, and Anyo) | Territory Lost | Vicariate Apostolic of Shunking [Nanchong], China | Erected |
| 2 Aug | Vicariate Apostolic of Chungking [Chongqing], China (Wanhsien, Sinning, Suiting, Chuhshien, Tachu, Liangshan, Tienkiang, ChungcJiow, SMhchu, and Fengtu) | Territory Lost | Vicariate Apostolic of Wanhsien [Wanxian], China | Erected |
| 2 Aug | Vicariate Apostolic of Jehol [Jinzhou], China
Vicariate Apostolic of Moukden, China | Territory Lost | Prefecture Apostolic of Szepingkai, China (Tao-ciang-tao) | Erected |
| 2 Aug | Vicariate Apostolic of Brazzaville, Congo (Boundaries adjusted)
Vicariate Apostolic of Loango, Congo (Boundaries adjusted) | Territory Added | ||
| 14 Sep | Diocese of Padova {Padua}, Italy (Battutilo, Cazzago, and Ballò) | Territory Lost | Diocese of Treviso, Italy | Territory Added |
| 22 Nov | Vicariate Apostolic of Yünnanfu, China (Sze-mao, Ning-erh, Mo-kiang, King-hu, Yuan-mang, Sin-ping, Lan-tsang, Chen-yuan, King-tung, Mien-ning, Teng-chung, Pao-shan, Yung- Ping, Chen-Jcang, Lung-ling, Ta-U, Siang-yun, Jerh-yuan, Feng-y, Teng-chwan, Ping-chwan, Yun-lung, Mi-tu, Li-Mang, ...) | Territory Lost | Mission "Sui Iuris" of Tali [Dali], China | Erected |
| 27 Nov | Nunciature to Ireland | Established | ||
| 4 Dec | Vicariate Apostolic of Upper Nile {Nilo Superiore}, Uganda (Dstrict of Lira (or Langó) and part of Karamojo) | Territory Lost | Prefecture Apostolic of Nilo Equatoriale, Uganda | Territory Added |
| 20 Dec | Diocese of Arequipa, Peru
Vicariate Apostolic of Tarapacá, Chile | Territory Lost | Diocese of Iquique, Chile | Erected |
| 20 Dec | Diocese of Siedlce, Poland (Beguty and Tàbor) | Territory Lost | Archdiocese of Warszawa {Warsaw}, Poland | Territory Added |
| 26 Dec | Vicariate Apostolic of Upper Congo {Congo Superiore}, Congo (Dem. Rep.) (Kivu) | Territory Lost | Vicariate Apostolic of Kivu, Congo (Dem. Rep.) | Erected |
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