| Date | From | To | ||
|---|---|---|---|---|
| unknown | Congregation of Rural Catechists | Approbation | ||
| unknown | Congregation of Saint Theresa of the Child Jesus “Little Flower” | Founded | ||
| unknown | Titular See of Abdera | Suppressed | ||
| 3 Jan | Prefecture Apostolic of Coquilhatville, Congo (Dem. Rep.) (Bikoro)
Vicariate Apostolic of Léopoldville, Congo (Dem. Rep.) (Remaining part of Bikoro) | Territory Lost | Mission "Sui Iuris" of Bikoro, Congo (Dem. Rep.) | Erected |
| 3 Jan | Vicariate Apostolic of Zanzibar, Kenya (Laikipia) | Territory Lost | Vicariate Apostolic of Nyeri, Kenya | Territory Added |
| 3 Jan | Vicariate Apostolic of Nyeri, Kenya (Limuru) | Territory Lost | Vicariate Apostolic of Zanzibar, Kenya | Territory Added |
| 4 Jan | Prefecture Apostolic of Salisbury, Zimbabwe (Bubi, Bulalima-Mangwe, Bulawayo, Insiza, Matopo, Hyamandlovu, Unzinwane, Wankie, and part of Gwanda) | Territory Lost | Mission "Sui Iuris" of Bulawayo, Zimbabwe | Erected |
| 4 Jan | Archdiocese of Calcutta, India (Godda along with Deoghaz and Sarawan) | Territory Lost | Diocese of Patna, India | Territory Added |
| 12 Jan | Prefecture Apostolic of Sinú, Colombia | Name Changed | Prefecture Apostolic of San Jorge, Colombia | Name Changed |
| 12 Jan | Xaverian Brothers | Approbation | ||
| 1 Mar | Prefecture Apostolic of Coquilhatville, Congo (Dem. Rep.) (Ngoonbe) | Territory Lost | Prefecture Apostolic of Basankusu, Congo (Dem. Rep.) | Territory Added |
| 1 Mar | Prefecture Apostolic of Basankusu, Congo (Dem. Rep.) (Gkota-Bosaka) | Territory Lost | Prefecture Apostolic of Coquilhatville, Congo (Dem. Rep.) | Territory Added |
| 3 Mar | Prefecture Apostolic of Salisbury, Zimbabwe | Elevated | Vicariate Apostolic of Salisbury, Zimbabwe | Elevated |
| 6 Mar | Diocese of Basel e Lugano, Switzerland (Erbonne) | Territory Lost | Diocese of Como, Italy | Territory Added |
| 25 Mar | Priests of Saint Mary of Tinchebray | Approbation | ||
| 27 Mar | Diocese of Salt Lake, Utah, USA (Clark, Elko, Eureka, Lander, Lincoln, Nye, and White Pine)
Diocese of Sacramento, California, USA (Churchill, Douglas, Esmeralda, Humbodt, Lyon, Mineral, Ormsby, Storey, and Washoe) | Territory Lost | Diocese of Reno, Nevada, USA | Erected |
| 31 Mar | Vicariate Apostolic of Cameroun | Territory Lost | Prefecture Apostolic of Douala, Cameroon | Erected |
| 1 Apr | Vicariate Apostolic of Koango o Kwango, Congo (Dem. Rep.) (Western region) | Territory Lost | Vicariate Apostolic of Kisantu, Congo (Dem. Rep.) | Erected |
| 3 Apr | Vicariate Apostolic of Cameroun | Name Changed | Vicariate Apostolic of Yaoundé, Cameroon | Name Changed |
| 5 Apr | Vicariate Apostolic of Tsinanfu, China (Lintsing, Kwantao, Kwanhsien, Kiuhsien, Wucheng, Siatsing, Tungchang, Tangyi, Sinksien, Cheping, Tsingping, Poping, and Kaotang) | Territory Lost | Prefecture Apostolic of Linqing [Lintsing], China | Erected |
| 7 Apr | Vicariate Apostolic of Norvegia e Spitzbergen (Nord Trøndelag, Sør Trøndelag, and Møre) | Territory Lost | Mission "Sui Iuris" of Central Norway {Norvegia Centrale} | Erected |
| 8 Apr | Vicariate Apostolic of Norvegia e Spitzbergen (Finnmark, Tromsø, and Nordland (including the islands of Spitzbergen)) | Territory Lost | Mission "Sui Iuris" of Northern Norway {Norvegia Settentrionale} | Erected |
| 10 Apr | Vicariate Apostolic of Norvegia e Spitzbergen | Name Changed | Vicariate Apostolic of Oslo, Norway | Name Changed |
| 15 Apr | Vicariate Apostolic of Eastern New Guinea (Aitape and Sepik) | Territory Lost | Prefecture Apostolic of Central New Guinea | Territory Added |
| 6 May | Vicariate Apostolic of Senegambia, Senegal (Gambia) | Territory Lost | Mission "Sui Iuris" of Gambia | Erected |
| 6 May | Vicariate Apostolic of Foochow [Fuzhou], China (Kienning, Kienyang, Chungan, Pucheng, SungM, and Chengo) | Territory Lost | Mission "Sui Iuris" of Kienow [Jian’ou], China | Erected |
| 6 May | Vicariate Apostolic of Changteh [Changde], China (Lichow, Ansiang, Anfu, Ohihmen, Tzeli, and Tayung) | Territory Lost | Prefecture Apostolic of Lixian [Lichow], China | Erected |
| 7 May | Vicariate Apostolic of Changteh [Changde], China (Yochow, Pinkiang, Linsiang, and Hwajung) | Territory Lost | Prefecture Apostolic of Yueyang [Yochow], China | Erected |
| 22 May | Diocese of Amazonas, Brazil (Juruà and Tarauacà) | Territory Lost | Territorial Prelature of Juruá, Acre, Brazil | Erected |
| 28 May | Apostolic Administration of Harbin [Harbin], China | Erected | ||
| 16 Jun | Mission "Sui Iuris" of Sikkim, India | Elevated | Prefecture Apostolic of Sikkim, India | Elevated |
| 16 Jun | Vicariate Apostolic of Chefoo, China (Kaoyuan, Poshing, Kwangyo, Lintze, Poshan, Idushien, Linkiu, Showkwang, Changlo, and Ankiu) | Territory Lost | Prefecture Apostolic of Yiduxian [Iduhsien], China | Erected |
| 17 Jun | Vicariate Apostolic of Taiyüanfu, China (Yutze, Sliowyang, Pinting, Sienyang, Yuhsien, TaiJcu, Kihsien, Tsinyuan, SuJcow, and Taiyuan) | Territory Lost | Prefecture Apostolic of Yütze [Yuci], China | Erected |
| 17 Jun | Congregación de San Pedro ad-Vincula | Approbation | ||
| 18 Jun | Vicariate Apostolic of Chefoo, China (Haiyang, Muping, Weihaiwei, Wendeng, and Yungcheng) | Territory Lost | Mission "Sui Iuris" of Weihaiwei [Weihai], China | Erected |
| 19 Jun | Diocese of Csanád, Hungary (Cathedral moved) | Elevated | ||
| 19 Jun | Archdiocese of Puebla de los Ángeles, México (Teziutlan and Huetemalco) | Territory Lost | Diocese of Papantla, Puebla, México | Territory Added |
| 20 Jun | Vicariate Apostolic of Constantinople, Turkey | Territory Lost | Mission "Sui Iuris" of Trabzon, Turkey | Erected |
| 29 Jun | Franciscan Missionary Brothers | Approbation | ||
| 1 Jul | Vicariate Apostolic of Nanking [Nanjing], China (Tangshan, Fengshien, Peihsien, Tongshan, Siaohsien, Suining, Sutsien, and Pihsien) | Territory Lost | Prefecture Apostolic of Süchow, China | Erected |
| 2 Jul | Vicariate Apostolic of Ningpo [Ningbo], China (Chuchow, Sungyang, Lungchuan, Tsingtien, Yünhwo, Kingning, Suanping, Suichong, Kingyuan, and Tsinyun) | Territory Lost | Prefecture Apostolic of Chuchow, China | Erected |
| 7 Aug | Diocese of Przemyśl, Poland (Henrykówka) | Territory Lost | Archdiocese of Lviv, Ukraine | Territory Added |
| 11 Aug | Diocese of Melo, Uruguay | Name Changed | Diocese of Florida-Melo, Uruguay | Name Changed |
| 17 Aug | Mission "Sui Iuris" of Tsitsihar [Qiqihar], China | Elevated | Prefecture Apostolic of Qiqihar [Tsitsihar], China | Elevated |
| 20 Aug | Archdiocese of Izmir (Smirne), Turkey (Island of Mytilene) | Territory Lost | Diocese of Chios (Scio), Greece | Territory Added |
| 22 Aug | Prefecture Apostolic of Central New Guinea | Elevated | Vicariate Apostolic of Central New Guinea | Elevated |
| 26 Sep | Delegation to Bulgaria | Established | ||
| 1 Nov | Vicariate Apostolic of Sianfu, China (Sanyüan, Changwu, Sanshui, Tungkwan, Pinchow, Yaochow, Chunhwa, Yungshow, Fuping, Kienchow, Lichiian, Wukung, Hingping, Sienyang, Kingyang, and Kaoling) | Territory Lost | Prefecture Apostolic of Sanyüan [Sanyuan], China | Erected |
| 3 Nov | Vicariate Apostolic of Sianfu, China (Tungchow, Hangeheng, Tengeheng, Peishui, Pucheng, Chaoyi, Pinmin, Weinan, Hwachow, Hwayin, Hoyang, and Tungkwan) | Territory Lost | Mission "Sui Iuris" of Tungchow [Tongzhou], China | Erected |
| 27 Nov | Archdiocese of Köln {Cologne}, Germany (Auf dem Dümpel, Piene, Strasse, and Neuenschmiede) | Territory Lost | Archdiocese of Paderborn, Germany | Territory Added |
| 27 Nov | Archdiocese of Paderborn, Germany (Berg, Bieber, Clemens, and Stracke) | Territory Lost | Archdiocese of Köln {Cologne}, Germany | Territory Added |
| 12 Dec | Missionaries of the Holy Spirit | Decretum Laudis | ||
| 13 Dec | Mission "Sui Iuris" of Tali [Dali], China | Elevated | Prefecture Apostolic of Tali [Dali], China | Elevated |
| 21 Dec | Prefecture Apostolic of Baie d’Hudson {Hudson Bay}, Manitoba, Canada | Elevated | Vicariate Apostolic of Baie d’Hudson {Hudson Bay}, Manitoba, Canada | Elevated |
| 22 Dec | Territorial Abbey of Lindi, Tanzania (Lindi) | Territory Lost | Territorial Abbey of Ndanda, Tanzania | Erected |
| 22 Dec | Prefecture Apostolic of Iringa, Tanzania (Lulanga and Masagati) | Territory Lost | Vicariate Apostolic of Dar-es-Salaam, Tanzania | Territory Added |
| 23 Dec | Territorial Abbey of Lindi, Tanzania | Name Changed | Territorial Abbey of Peramiho, Tanzania | Name Changed |
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