| Date | From | To | ||
|---|---|---|---|---|
| unknown | St. Patrick’s Society for the Foreign Missions | Founded | ||
| 2 Jan | Diocese of Fulda, Germany (Towns of Borussici, Höringhausen, Eimelrod, Hemmighausen, and Deisfeld) | Territory Lost | Archdiocese of Paderborn, Germany | Territory Added |
| 11 Jan | Prefecture Apostolic of Chaohsien [Zhaoxian], China | Elevated | Vicariate Apostolic of Chaohsien [Zhaoxian], China | Elevated |
| 18 Jan | Vicariate Apostolic of Quinhon, Viet Nam (Attopen, Banmetuot, Kontum, and part of Quangnam) | Territory Lost | Vicariate Apostolic of Kontum, Viet Nam | Erected |
| 21 Jan | Vicariate Apostolic of Jehol [Jinzhou], China (Chihfeng, Kienping, Outan, Ningcheng, Weichang, and Kingpeng) | Territory Lost | Prefecture Apostolic of Chihfeng [Chifeng], China | Erected |
| 2 Feb | Vicariate Apostolic of Costa d’Oro {Gold Coast}, Ghana (Kingdom of Ashanti) | Territory Lost | Vicariate Apostolic of Kumasi, Ghana | Erected |
| 3 Feb | Vicariate Apostolic of Khartoum, Sudan (Area North of Foumban) | Territory Lost | Vicariate Apostolic of Foumban, Cameroon | Territory Added |
| 4 Feb | Vicariate Apostolic of Moukden, China (Civil district East of Tung-Pien-Tao) | Territory Lost | Prefecture Apostolic of Fushun, China | Erected |
| 5 Feb | Diocese of Guayana, Venezuela (Amazonas and La Urbana) | Territory Lost | Prefecture Apostolic of Alto Orinoco, Venezuela | Erected |
| 5 Feb | Diocese of Botucatu, Brazil (Parish of Itahy) | Territory Lost | Diocese of Sorocaba, Brazil | Territory Added |
| 5 Feb | Diocese of Sorocaba, Brazil (Parish of Bofate) | Territory Lost | Diocese of Botucatu, Brazil | Territory Added |
| 22 Feb | Vicariate Apostolic of Diégo-Suarez, Madagascar (Sambirano and Moromandia) | Territory Lost | Prefecture Apostolic of Isole di Mayotta, Nossi-Bé e Comore, Madagascar | Territory Added |
| 22 Mar | Diocese of Transilvania, Erdély, Siebenbürgen, Romania | Name Changed | Diocese of Alba Iulia, Romania | Name Changed |
| 22 Mar | Prefecture Apostolic of Katanga, Congo (Dem. Rep.) | Elevated | Vicariate Apostolic of Katanga, Congo (Dem. Rep.) | Elevated |
| 22 Mar | Prefecture Apostolic of Coquilhatville, Congo (Dem. Rep.) | Elevated | Vicariate Apostolic of Coquilhatville, Congo (Dem. Rep.) | Elevated |
| 23 Mar | Vicariate Apostolic of Kweyang [Guiyang] (Kweiyang), China (Houping, Wuchwan, Yehho, Lungchuan, Tehkiang, Szenan, Yinkiang, Sungtao, Shihtsien, Kiangkow, Tungjen, Szehsien, Yuping , Shengki, Shiping, Tsingki, Chenyuan, Hwangping, Taikuing, Tsingkiang, Kiungshui, Tienchu, Kingping, Yungkiang, Liping, Yungtsung, ...) | Territory Lost | Mission "Sui Iuris" of Shihtsien [Shiqian], China | Erected |
| 26 Mar | Vicariate Apostolic of Jehol [Jinzhou], China (Loupei, Liutung, Liumsi, Tienshan, Kailou, and Soeitung) | Territory Lost | Prefecture Apostolic of Szepingkai, China | Territory Added |
| 20 Apr | Vicariate Apostolic of Batavia, Indonesia (Priangan and Cheribon) | Territory Lost | Prefecture Apostolic of Bandung, Indonesia | Erected |
| 22 Apr | Archdiocese of Köln {Cologne}, Germany (Eiberg in Essen) | Territory Lost | Archdiocese of Paderborn, Germany | Territory Added |
| 25 Apr | Vicariate Apostolic of Batavia, Indonesia (Pekalongan, Banjoemas, and Kedoe (except Tennangseng and Magalang)) | Territory Lost | Prefecture Apostolic of Purwokerto, Indonesia | Erected |
| 2 May | Archeparchy of Petra e Filadelfia (Melkite Greek), Jordan | Erected | ||
| 6 May | Missionaries of the Sacred Hearts of Jesus and Mary (Mallorca) | Approbation | ||
| 6 May | St. Joseph’s Society of the Sacred Heart | Decretum Laudis | ||
| 7 May | Vicariate Apostolic of Phát Diêm, Viet Nam (Annamite province of Thanh-Hoa and to the Laotian province of San-Nua or Huaphanh Câu-Laos) | Territory Lost | Vicariate Apostolic of Thanh Hóa, Viet Nam | Erected |
| 27 May | Prefecture Apostolic of Douala, Cameroon | Elevated | Vicariate Apostolic of Douala, Cameroon | Elevated |
| 27 May | Prefecture Apostolic of Kavirondo, Kenya | Elevated | Vicariate Apostolic of Kisumu, Kenya | Elevated |
| 28 May | Vicariate Apostolic of Costa d’Oro {Gold Coast}, Ghana (Territory between Kumasi and Navrongo) | Territory Lost | Prefecture Apostolic of Navrongo, Ghana | Territory Added |
| 1 Jun | Mission "Sui Iuris" of Hwangchow, China | Elevated | Prefecture Apostolic of Hwangchow, China | Elevated |
| 1 Jun | Mission "Sui Iuris" of Changtien, China | Elevated | Prefecture Apostolic of Changtien, China | Elevated |
| 1 Jun | Prefecture Apostolic of Szepingkai, China | Elevated | Vicariate Apostolic of Szepingkai [Siping], China | Elevated |
| 4 Jun | Vicariate Apostolic of Caquetá, Colombia (Boundaries adjusted) | Territory Added | ||
| 11 Jun | Apostolic Exarchate of Istanbul (Constantinople) (Greek), Turkey | Territory Lost | Apostolic Exarchate of Greece (Greek) | Erected |
| 11 Jun | Eparchy of Tiruvalla (Syro-Malankara), India (Districts of Tiruvalla, Niranam, Kottayam, Muvattupuzha, and Kunnamkulam) | Erected | ||
| 11 Jun | Archeparchy of Trivandrum (Syro-Malankara), India (Districts of Trivandrum, Kottarakkara, Adow, Pathanamthitta, Mavelikara, Kayamkulam, and Chengannur) | Erected | ||
| 17 Jun | Vicariate Apostolic of Sianfu, China (Chouchih, Shingping, Hushien, Wukung, Fufeng, and Meishien) | Territory Lost | Prefecture Apostolic of Chowchich [Zhouzhi], China | Erected |
| 17 Jun | Vicariate Apostolic of Luanfu, China (Hungtung, Chaocheng, Fensi, Hohsien, Lingshih, Yunghwo, Sihsien, Taning, Puhsien, Lufeng, Siangling, Fowshan, and Antseh) | Territory Lost | Prefecture Apostolic of Hungtung [Hongdong], China | Erected |
| 17 Jun | Prefecture Apostolic of Shohchow, China | Elevated | Vicariate Apostolic of Shohchow [Shuoxian], China | Elevated |
| 17 Jun | Prefecture Apostolic of Tatungfu, China | Elevated | Vicariate Apostolic of Tatungfu, China | Elevated |
| 7 Jul | Archdiocese of Cartagena, Colombia (Atlántico) | Territory Lost | Diocese of Barranquilla, Colombia | Erected |
| 7 Jul | Vicariate Apostolic of Los Llanos de San Martín (Piani di San Martino), Colombia (Boundaries adjusted) | Territory Added | ||
| 15 Jul | Diocese of Cebu, Philippines (Siqujior island)
Diocese of Jaro o Santa Elisabetta, Philippines (Negros island along with small islands to the East) | Territory Lost | Diocese of Bacolod, Philippines | Erected |
| 15 Jul | Diocese of Nueva Segovia, Philippines | Territory Lost | Prefecture Apostolic of Mountain Provinces (Montanosa), Philippines (Montana) | Erected |
| 18 Jul | Mission "Sui Iuris" of Bulawayo, Zimbabwe | Elevated | Prefecture Apostolic of Bulawayo, Zimbabwe | Elevated |
| 18 Jul | Diocese of Allahabad, India (districts of Sagar, Damoh, Rewa, Siddhi, Shahdol, Satna, Panna, Chattarpur, and Tikamgarh)
Diocese of Nagpur, India (districts of Jabalpur, Mandla, Narsinghpur and the tahsil of Laknadon) | Territory Lost | Prefecture Apostolic of Jubbulpore, India | Erected |
| 18 Jul | Prefecture Apostolic of Padang, Indonesia | Elevated | Vicariate Apostolic of Padang, Indonesia | Elevated |
| 18 Jul | Vicariate Apostolic of Tanganyika, Tanzania (Eastern part) | Territory Lost | Mission "Sui Iuris" of Tukuyu, Tanzania | Erected |
| 18 Jul | Vicariate Apostolic of Sapporo, Japan (Island of Karafuto or Sakhalin) | Territory Lost | Mission "Sui Iuris" of Karafuto, Japan | Erected |
| 18 Jul | Vicariate Apostolic of Nouvelle-Anvers, Congo (Dem. Rep.) (Boundaries adjusted)
Prefecture Apostolic of Ubanghi Belga {Belgian Ubanghi}, Congo (Dem. Rep.) (Boundaries adjusted) | Territory Added | ||
| 18 Jul | Vicariate Apostolic of Tanganyika, Tanzania (Ngulu and Vgunâa and part of Vgansi) | Territory Lost | Vicariate Apostolic of Tabora, Tanzania | Territory Added |
| 18 Jul | Vicariate Apostolic of Bukoba, Tanzania
Vicariate Apostolic of Tabora, Tanzania | Territory Lost | Vicariate Apostolic of Tanganyika, Tanzania (Kibondo) | Territory Added |
| 1 Aug | Diocese of Dubrovnik (Ragusa), Croatia (Lagosta island)
Diocese of Krk (Veglia), Croatia (Gherso, Lussino, and other smaller islands around Liburnian gulf) | Territory Lost | Archdiocese of Zadar (Zara), Croatia (Limited to area controlled by Italy) | Territory Added |
| 1 Aug | Archdiocese of Zadar (Zara), Croatia (no longer a Metropolitan) | Elevated | ||
| 1 Aug | Diocese of Kotor (Cattaro), Montenegro (from Zadar to Immediately Subject) | Metropolitan Changed | ||
| 1 Aug | Diocese of Hvar (-Brac e Vis), Croatia (from Zadar to Immediately Subject) | Metropolitan Changed | ||
| 1 Aug | Diocese of Dubrovnik (Ragusa), Croatia (from Zadar to Immediately Subject) | Metropolitan Changed | ||
| 1 Aug | Diocese of Šibenik (Knin), Croatia (from Zadar to Immediately Subject) | Metropolitan Changed | ||
| 1 Aug | Diocese of Split-Makarska (Spalato-Macarska), Croatia (from Zadar to Immediately Subject) | Metropolitan Changed | ||
| 22 Aug | Society of Christ for Polish Immigrants | Founded | ||
| 24 Oct | Missionários da Boa Nova | Approbation | ||
| 11 Nov | Archdiocese of München und Freising {Munich}, Germany (Territory of Petrus Hoeek) | Territory Lost | Diocese of Augsburg, Germany | Territory Added |
| 15 Nov | Vicariate Apostolic of Sianfu, China (Fong-siang, Lungchow, Kiengyang, Linyn, Paoki, and Kishan) | Territory Lost | Prefecture Apostolic of Fengsiang [Fengxiang], China | Erected |
| 18 Nov | Diocese of Goiás, Brazil | Elevated | Archdiocese of Goiás, Brazil | Elevated |
| 18 Nov | Diocese of Porto Nacional, Tocatins, Brazil (from Mariana to Goiás) | Metropolitan Changed | ||
| 18 Nov | Territorial Prelature of São José de Alto Tocantins, Brazil (from Mariana to Goiás) | Metropolitan Changed | ||
| 18 Nov | Territorial Prelature of Jataí, Brazil (from Mariana to Goiás) | Metropolitan Changed | ||
| 18 Nov | Territorial Prelature of Bananal, Brazil (from Mariana to Goiás) | Metropolitan Changed | ||
| 29 Nov | Vicariate Apostolic of Yükiang [Yujiang], China (Nangcheng, Tzuhi, Nanfeng, Lituan, and Kuanchang) | Territory Lost | Prefecture Apostolic of Kienchangfu, China | Erected |
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