| Date | From | To | ||
|---|---|---|---|---|
| unknown | Catholic Foreign Mission Society of America | Approbation | ||
| unknown | Titular See of Druzipara | Name Changed | Titular See of Drizipara | Name Changed |
| unknown | Titular See of Flaviopolis | Name Changed | Titular See of Cratia | Name Changed |
| 7 Jan | Diocese of Regensburg, Germany (Schönbrunn and Strasshaus) | Territory Lost | Diocese of Eichstätt, Germany | Territory Added |
| 10 Jan | Delegation to Belgian Congo | Established | ||
| 11 Jan | Delegation to Africa for the Missions | Established | ||
| 25 Jan | Vicariate Apostolic of Tsinchow [Tianshui], China (Kingyuentao (Pingliang, Huating, Tsing-ning , Lungteh, Chwanglang, Kingyang, Ninghsien, Cheng-ning, Hoshui, Hwanhsien, Kingchow, Tsungsin, Ohenyuen, Lingtai, Kuyen, Haiyan, and Hwaping)) | Territory Lost | Prefecture Apostolic of Pingliang [Pingliang], China | Erected |
| 25 Jan | Diocese of Sapë, Albania (MazreTcu and ShllaJcu) | Territory Lost | Archdiocese of Shkodrë, Albania | Territory Added |
| 25 Jan | Archdiocese of Shkodrë, Albania (Staßa) | Territory Lost | Diocese of Sapë, Albania | Territory Added |
| 25 Jan | Diocese of Poona, India (Khandala and Kune) | Territory Lost | Archdiocese of Bombay, India | Territory Added |
| 27 Jan | Diocese of Santa Cruz de la Sierra, Bolivia (Ñuflo de Chávez, Velasco, and Chiquitos) | Territory Lost | Vicariate Apostolic of Chiquitos, Bolivia | Erected |
| 31 Jan | Archdiocese of Regina, Saskatchewan, Canada (Southwestern part of Saskatchewan) | Territory Lost | Diocese of Gravelbourg, Saskatchewan, Canada | Erected |
| 7 Feb | Archdiocese of Eger, Hungary (Pernye-puszta estate) | Territory Lost | Diocese of Vác, Hungary | Territory Added |
| 12 Feb | Diocese of Rockhampton, Australia (From Townsville on the Coast, to the Whitsunday and Burdekin regions in the South and North to Ingham and Halifax, south-west to Winton, and west to the border with the Northern Territory, with Mount Isa and several western towns and east to Palm Island) | Territory Lost | Diocese of Townsville, Australia | Erected |
| 14 Feb | Vicariate Apostolic of Lanchowfu, China (Region of Sinkiang (Wensuh The Tao, the Chuhn Tao, the Ningyuan Tao, and the Thwa Tao civil provinces)) | Territory Lost | Mission "Sui Iuris" of Sinkiang [Xinjiang-Urumqi], China | Erected |
| 19 Feb | Prefecture Apostolic of Canelos e Macas, Ecuador (Macas) | Territory Lost | Vicariate Apostolic of Méndez y Gualaquiza, Ecuador | Territory Added |
| 19 Feb | Prefecture Apostolic of Canelos e Macas, Ecuador | Name Changed | Prefecture Apostolic of Canelos, Ecuador | Name Changed |
| 3 Mar | Institute of the Josephites of Belgium | Approbation | ||
| 28 Mar | Diocese of Pinsk, Belarus (Orchów) | Territory Lost | Diocese of Siedlce, Poland | Territory Added |
| 30 Mar | Vicariate Apostolic of Mariannhill, South Africa (Southern region) | Territory Lost | Prefecture Apostolic of Umtata, South Africa | Erected |
| 30 Mar | Vicariate Apostolic of Canale di Suez {Suez Canal}, Egypt (Boundaries Adjusted) | Territory Added | ||
| 30 Mar | Diocese of Chios (Scio), Greece (Patmon)
Diocese of Santorini {Thira}, Greece (Astypalaea) | Territory Lost | Archdiocese of Rhodos {Rhodes}, Greece (Lisson) | Territory Added |
| 30 Mar | Vicariate Apostolic of Transvaal, South Africa (Marico and Rustemburg) | Territory Lost | Vicariate Apostolic of Kimberley in South Africa {nell’Africa Meridionale} | Territory Added |
| 12 May | Franciscan Brothers of the Third Order Regular, Mountbellow | Decretum Laudis | ||
| 23 May | Archdiocese of Warszawa {Warsaw}, Poland (Albertòw and Jankówek) | Territory Lost | Diocese of Łódź, Poland | Territory Added |
| 26 May | Diocese of Quilon, India (Talulcs of Travancore: Valavanlcode, Kalkulam, Towala, and Agastisvaram (except Districts of Towàla, Agastisvaràm, and a portion of Valavanlcode)) | Territory Lost | Diocese of Kottar, India | Erected |
| 26 May | Diocese of Kumbakonam, India
Diocese of Mysore, India Archdiocese of Pondicherry, India | Territory Lost | Diocese of Salem, India (District of Salem) | Erected |
| 31 May | Prefecture Apostolic of Northern Solomon Islands, Papua New Guinea | Elevated | Vicariate Apostolic of Northern Solomon Islands, Papua New Guinea | Elevated |
| 31 May | Prefecture Apostolic of Caquetá, Colombia | Elevated | Vicariate Apostolic of Caquetá, Colombia | Elevated |
| 31 May | Prefecture Apostolic of Wuchang [Wuchang], China | Elevated | Vicariate Apostolic of Wuchang [Wuchang], China | Elevated |
| 5 Jun | Archdiocese of Bucarest {Bucureşti}, Romania (became a Metropolitan) | Elevated | ||
| 5 Jun | Archdiocese of Făgăraş şi Alba Iulia (Romanian), Romania (150 parishes)
Diocese of Gherla, Armenopoli, Szamos-Ujvár (Romanian), Romania | Name Changed | Diocese of Cluj-Gherla (Claudiopoli-Armenopoli) (Romanian), Romania | Name Changed |
| 5 Jun | Archdiocese of Făgăraş şi Alba Iulia (Romanian), Romania (Boian)
Diocese of Gherla, Armenopoli, Szamos-Ujvár (Romanian), Romania (169 parishes) Diocese of Hajdúdorog (Hungarian), Hungary (10 parishes) Eparchy of Mukachevo (Munkács) (Ruthenian), Ukraine (11 parishes) Diocese of Oradea Mare {Gran Varadino} (Romanian), Romania (31 parishes) Eparchy of Stanislaviv (Ukrainian), Ukraine (17 parishes) Apostolic Administration of Târgul-Siret (Ruthenian), Romania | Territory Lost | Diocese of Maramureş (Romanian), Romania | Erected |
| 5 Jun | Apostolic Administration of Timişoara, Romania | Elevated | Diocese of Timişoara, Romania | Elevated |
| 5 Jun | Ordinariate of Romania (Armenian) | Erected | ||
| 5 Jun | Diocese of Oradea Mare {Gran Varadino, Nagyvárad}, Romania
Diocese of Satu Mare {Szatmár}, Romania | United | Diocese of Oradea Mare {Gran Varadino, Nagyvárad} and Satu Mare {Szatmár}, Romania | United |
| 5 Jun | Archdiocese of Lviv, Ukraine (Bucovina) | Territory Lost | Diocese of Iaşi, Romania | Territory Added |
| 5 Jun | Diocese of Transilvania, Erdély, Siebenbürgen, Romania (from Kalocsa) | Metropolitan Changed | ||
| 5 Jun | Diocese of Iaşi, Romania (from Immediately Subject) | Metropolitan Changed | ||
| 5 Jun | Diocese of Oradea Mare {Gran Varadino} (Romanian), Romania (19 parishes) | Territory Lost | Diocese of Lugoj (Romanian), Romania | Territory Added |
| 5 Jun | Diocese of Gherla, Armenopoli, Szamos-Ujvár (Romanian), Romania (82 parishes) | Territory Lost | Diocese of Oradea Mare {Gran Varadino} (Romanian), Romania | Territory Added |
| 10 Jun | Missionaries of Workers | Decretum Laudis | ||
| 27 Jun | Archdiocese of München und Freising {Munich}, Germany (House of Mathias Steurer) | Territory Lost | Diocese of Augsburg, Germany | Territory Added |
| 28 Jun | Vicariate Apostolic of Cape of Good Hope, Western District {Capo di Buona Speranza, Distretto Occidentale}, South Africa (Worcester, Tulbagh, Ceres, Swellendam, Riversday, Montagu, Robertson, Laingsburg, Sutherland, and Ladysmith) | Territory Lost | Prefecture Apostolic of Cape of Good Hope, Central District {Capo di Buona Speranza, Distretto Centrale}, South Africa | Territory Added |
| 30 Jun | Vicariate Apostolic of Bangkok, Thailand (Bajauri, Surat, and Srithamarat)
Diocese of Malacca, Singapore (Patani and Phuket) | Territory Lost | Mission "Sui Iuris" of Rajaburi, Thailand | Erected |
| 30 Jun | Vicariate Apostolic of Nanning [Nanning], China (Wuchow, Waitsap, Tangyuen, Pingnam, Shumkai, Jungyun, Paklow, Luckchuen, Pokpak, Hohsien, Sunto, CMuping, Mungshan, and Watlam, excluding Tai-ou-Tung) | Territory Lost | Mission "Sui Iuris" of Wuchow [Wuzhou], China | Erected |
| 4 Jul | Ordinariate of Eritrea (Ethiopian), Eritrea | Erected | ||
| 14 Jul | Prefecture Apostolic of Great Namaqualand, Namibia | Elevated | Vicariate Apostolic of Great Namaqualand, Namibia | Elevated |
| 14 Jul | Archdiocese of Verapoly, India (Asamannur, Perumbavoor, Vengoor, Rayamangalam, and Cheranallur (all in Kunnatnad), Muvattupuzha, Todupuzha, Devicolam, Peermade, Minachil, Kottayam, and Changanacherry along with parts of Tiruvalla, Pathanamtitta, and Amabalapulai) | Territory Lost | Diocese of Vijayapuram, India | Erected |
| 23 Jul | Vicariate Apostolic of Changsha [Changsha], China (Hengchow, Leyyang, Thanguin, Chengsien, Ichang, Koeigang, Koeitong, Scinnin, Yungscin, Nganjen, and Liusien) | Territory Lost | Vicariate Apostolic of Hengchow [Hengyang], China | Erected |
| 23 Jul | Prefecture Apostolic of Matadi, Congo (Dem. Rep.) | Elevated | Vicariate Apostolic of Matadi, Congo (Dem. Rep.) | Elevated |
| 1 Aug | Diocese of Lead, South Dakota, USA | Name Changed | Diocese of Rapid City, South Dakota, USA | Name Changed |
| 13 Aug | Archdiocese of Köln {Cologne}, Germany (from the North Eifel (Mechernich, Schleiden) to the Lower Rhine (Krefeld)) | Territory Lost | Diocese of Aachen, Germany | Erected |
| 13 Aug | Diocese of Wrocław (Breslau), Poland | Territory Lost | Diocese of Berlin, Germany | Erected |
| 13 Aug | Diocese of Paderborn, Germany | Elevated | Archdiocese of Paderborn, Germany | Elevated |
| 13 Aug | Diocese of Wrocław (Breslau), Poland | Elevated | Archdiocese of Wrocław {Breslavia}, Poland | Elevated |
| 13 Aug | Vicariate Apostolic of North German Missions {Germania Settentrionale} | Suppressed | Diocese of Osnabrück, Germany
Archdiocese of Paderborn, Germany | Territory Added |
| 13 Aug | Apostolic Administration of Schneidemühl, Poland | Elevated | Territorial Prelature of Schneidemühl, Poland | Elevated |
| 13 Aug | Diocese of Limburg, Germany (from Freiburg im Breisgau) | Metropolitan Changed | ||
| 13 Aug | Diocese of Osnabrück, Germany (from Immediately Subject) | Metropolitan Changed | ||
| 13 Aug | Diocese of Warmia (Ermland), Poland (from Immediately Subject) | Metropolitan Changed | ||
| 13 Aug | Diocese of Hildesheim, Germany (from Immediately Subject) | Metropolitan Changed | ||
| 13 Aug | Diocese of Fulda, Germany (from Freiburg im Breisgau) | Metropolitan Changed | ||
| 20 Aug | Diocese of Vicenza, Italy (Bubbio, Burcia, and the area between Bosà and Cittadella) | Territory Lost | Diocese of Padova {Padua}, Italy | Territory Added |
| 20 Aug | Diocese of Padova {Padua}, Italy (Saline, Vicentina, and Brancaglia) | Territory Lost | Diocese of Vicenza, Italy | Territory Added |
| 1 Sep | Prefecture Apostolic of Schlewig-Holstein, Germany | Suppressed | Diocese of Osnabrück, Germany | Territory Added |
| 3 Oct | Missionários da Boa Nova | Founded | ||
| 15 Oct | Nunciature to Dominican Republic (to Nunciature) | Elevated | ||
| 17 Oct | Nunciature to Haiti (to Nunciature) | Elevated | ||
| 14 Nov | Diocese of Oklahoma, USA | Name Changed | Diocese of Oklahoma City and Tulsa, Oklahoma, USA | Name Changed |
| 20 Nov | Vicariate Apostolic of Siwantze [Chongli-Xiwanzi], China (Hinghouo and part of Shangtu) | Territory Lost | Vicariate Apostolic of Tsining [Jining], China | Territory Added |
| 5 Dec | Diocese of Fulda, Germany (Treis ad Lumdam, Dorheim, Schwalheim, Eödgenr, Massenheim, and part of Mittel-Gründau, Bühnerhof, and Hüttengesäss-Neuwiedermus) | Territory Lost | Diocese of Mainz, Germany | Territory Added |
| 20 Dec | Vicariate Apostolic of Hanchung [Hanzhong] (Hanchungfu), China (Chemping) | Territory Lost | Prefecture Apostolic of Ankang [Hinganfu], China | Territory Added |
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