| Date | From | To | ||
|---|---|---|---|---|
| 12 Jan | Diocese of Allahabad, India (Jhansi, Jalaun, Eamirpur, and Banda) | Territory Lost | Prefecture Apostolic of Jhansi, India | Erected |
| 12 Jan | Archdiocese of Agra, India (Shahjahanpur and Piltbhit)
Diocese of Allahabad, India (Lucknow, Unnao, Barabanki, Gonda, Hardoi, Sitapur, Baliraichj Kheri, Nainital, and Almora) | Territory Lost | Diocese of Lucknow, India | Erected |
| 12 Jan | Vicariate Apostolic of Wonsan, Korea (North) (Qensan (or Wonsan) and Ampen, Tokugen, Bunsen, and Eo gen) | Territory Lost | Territorial Abbey of Tokugen o Tokwon, Korea (North) | Erected |
| 12 Jan | Vicariate Apostolic of Wonsan, Korea (North) | Name Changed | Vicariate Apostolic of Kanko o Hamheung, Korea (North) | Name Changed |
| 13 Jan | Vicariate Apostolic of Keewatin, Manitoba, Canada (Territory of the Montagnais) | Territory Lost | Vicariate Apostolic of Baie d’Hudson {Hudson Bay}, Manitoba, Canada | Territory Added |
| 13 Feb | Diocese of Mysore, India (Bangalore, Kolara, Tumakuru, and Chitradurga) | Territory Lost | Diocese of Bangalore, India | Erected |
| 13 Feb | Prefecture Apostolic of Fushun, China | Elevated | Vicariate Apostolic of Fushun [Fushun], China | Elevated |
| 13 Feb | Diocese of Nellore, India (Guntur) | Territory Lost | Diocese of Guntur, India | Erected |
| 13 Feb | Vicariate Apostolic of Gimma, Ethiopia (Gambattà-Gudella and part of Voliam)
Prefecture Apostolic of Neghelli, Ethiopia (Gambattà (left bank of the river Billate)) | Territory Lost | Prefecture Apostolic of Hosanna, Ethiopia | Erected |
| 13 Feb | Vicariate Apostolic of Gimma, Ethiopia (Guraghe Hadia) | Territory Lost | Prefecture Apostolic of Endeber, Ethiopia | Erected |
| 13 Feb | Diocese of Coimbatore, India (Nilgiris and area north of the river Bhavani and its tributary Moyar) | Territory Lost | Diocese of Mysore, India | Territory Added |
| 17 Feb | Diocese of San Carlos de Ancud, Chile (Southern part) | Territory Lost | Prefecture Apostolic of Aysén, Chile | Erected |
| 29 Feb | Diocese of Trujillo, Peru (Piura and Tumbes) | Territory Lost | Diocese of Piura, Peru | Erected |
| 2 Mar | Archdiocese of Urbino, Italy | Territory Lost | Diocese of Urbania e Sant’Angelo in Vado, Italy (St. Peter in Metola) | Territory Added |
| 9 Apr | Vicariate Apostolic of Costa d’Avorio (Right bank of the river Bandama (except Tiassalé)) | Territory Lost | Vicariate Apostolic of Sassandra, Côte d’Ivoire | Erected |
| 9 Apr | Vicariate Apostolic of Costa d’Avorio | Name Changed | Vicariate Apostolic of Abidjan, Côte d’Ivoire | Name Changed |
| 9 Apr | Mission "Sui Iuris" of Kiamusze [Jiamusi], China | Elevated | Prefecture Apostolic of Jiamusi [Kiamusze], China | Elevated |
| 28 May | Vicariate Apostolic of Oubangui Chari, Central African Republic (Southern part) | Territory Lost | Vicariate Apostolic of Brazzaville, Congo | Territory Added |
| 28 May | Vicariate Apostolic of Foumban, Cameroon
Vicariate Apostolic of Oubangui Chari, Central African Republic | Territory Lost | Prefecture Apostolic of Berbérati, Central African Republic | Erected |
| 28 May | Vicariate Apostolic of Oubangui Chari, Central African Republic | Name Changed | Vicariate Apostolic of Bangui, Central African Republic | Name Changed |
| 28 May | Vicariate Apostolic of Süchow [Xuzhou], China (area north and east of Lake Weishan) | Territory Lost | Vicariate Apostolic of Yenchowfu, China | Territory Added |
| 11 Jun | Scarboro Foreign Mission Society | Approbation | ||
| 22 Jun | Archdiocese of Cuiabá, Mato Grosso, Brazil (Boundaries adjusted)
Territorial Prelature of Diamantino, Mato Grosso, Brazil (Boundaries adjusted) Diocese of São Luíz de Cáceres, Mato Grosso, Brazil (Boundaries adjusted) | Territory Added | ||
| 25 Jun | Vicariate Apostolic of Batavia, Indonesia (Central Java (Midden-Java)) | Territory Lost | Vicariate Apostolic of Semarang, Indonesia | Erected |
| 25 Jun | Mission "Sui Iuris" of Bikoro, Congo (Dem. Rep.) | Elevated | Prefecture Apostolic of Bikoro, Congo (Dem. Rep.) | Elevated |
| 25 Jun | Vicariate Apostolic of Hangchow [Hangzhou], China (Kinhwa (Kinhwa, Iwu, Pukiang, Tungyang, Yungkang, Wuyi, Tangid, and Lance)) | Territory Lost | Prefecture Apostolic of Lishui [Lishui], China | Territory Added |
| 9 Jul | Vicariate Apostolic of Orange River, South Africa | Name Changed | Vicariate Apostolic of Keimoes, South Africa | Name Changed |
| 9 Jul | Diocese of Chittagong, Bangladesh (Aralcan in Burma (Akyab, Paletto, Eyankpyu, and Sandoway)) | Territory Lost | Prefecture Apostolic of Akyab, Myanmar | Erected |
| 13 Jul | Diocese of Corumbá, Mato Grosso do Sul, Brazil
Archdiocese of Cuiabá, Mato Grosso, Brazil Territorial Prelature of Registro do Araguaia, Brazil | Territory Lost | Territorial Prelature of Chapada, Brazil | Erected |
| 1 Aug | Vicariate Apostolic of Yükiang [Yujiang], China (Tzeki) | Territory Lost | Vicariate Apostolic of Nancheng [Nancheng], China | Territory Added |
| 4 Sep | Territorial Prelature of Mozambico (Zambézia (Beira, Tete, and Quelimane)) | Territory Lost | Diocese of Beira, Mozambique | Erected |
| 4 Sep | Territorial Prelature of Mozambico (Niassa (Mocambique and Pòrto Amelia)) | Territory Lost | Diocese of Nampula, Mozambique | Erected |
| 4 Sep | Territorial Prelature of Mozambico (Sui do Save (Lourenço Marques and Inhambane)) | Elevated | Archdiocese of Lourenço Marques, Mozambique | Elevated |
| 4 Sep | Diocese of Macau, China (Island of Timor under the control of the Portuguese Republic) | Territory Lost | Diocese of Díli, Timor-Leste | Erected |
| 4 Sep | Prefecture Apostolic of Cubango in Angola (Benguela (Benguela and Huambo))
Mission "Sui Iuris" of Cunène, Angola (Huila (Mossâmedes and Huila)) | Territory Lost | Diocese of Nova Lisboa, Angola | Erected |
| 4 Sep | Prefecture Apostolic of Cubango in Angola (Bié (Bié and Moxico) and Lunda (in Malanje)) | Territory Lost | Diocese of Silva Porto, Angola | Erected |
| 4 Sep | Diocese of Angola e Congo (Luanda (Cabinda, Zaire, Gongo, Luanda, and Cuanza-North), Ciianza-Sul (in Benguela), and Malanje) | Elevated | Archdiocese of Luanda, Angola | Elevated |
| 4 Sep | Diocese of Santiago de Cabo Verde (Jesuit territory) | Territory Lost | Mission "Sui Iuris" of Guinea Portoghese, Guinea-Bissau | Erected |
| 4 Sep | Prefecture Apostolic of Cubango in Angola | Suppressed | ||
| 4 Sep | Mission "Sui Iuris" of Cunène, Angola | Suppressed | ||
| 4 Sep | Mission "Sui Iuris" of Lunda, Angola | Suppressed | ||
| 4 Sep | Prefecture Apostolic of Lower Congo in Cubango, Angola | Suppressed | ||
| 16 Nov | Diocese of Imola, Italy (S. Petronius in Castelbolognese) | Territory Lost | Diocese of Faenza, Italy | Territory Added |
| 16 Nov | Diocese of Faenza, Italy (Bianeanigo) | Territory Lost | Diocese of Imola, Italy | Territory Added |
| 17 Dec | Paulist Fathers | Approbation | ||
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