| Date | From | To |
|---|
| unknown | Archdiocese of Agra, India
| Territory Lost | Mission "Sui Iuris" of Rajputana, India
| Erected |
| 21 Jan | Archdiocese of Kingston, Ontario, Canada (Glengarry, Stormont, and Cornwall Counties)
| Territory Lost | Diocese of Alexandria (in America), Ontario, Canada
| Erected |
| 18 Mar | Vicariate Apostolic of Two Guineas {Des Deux Guinées}, Gabon
| Territory Lost | Prefecture Apostolic of Cameroun
| Erected |
| 18 Mar | Vicariate Apostolic of Two Guineas {Des Deux Guinées}, Gabon
| Name Changed | Vicariate Apostolic of Gabon, Gabon
| Name Changed |
| 7 May | | | Congregation of Saint Joseph
| Decretum Laudis |
| 14 May | | | Missionaries of Our Lady of La Salette
| Approbation |
| 17 Jun | Vicariate Apostolic of Shansi {Scian-Si} (Chan-Si), China
| Split | Vicariate Apostolic of Northern Shansi {Scian-Si Settentrionale}, China
Vicariate Apostolic of Southern Shansi {Scian-Si Meridionale}, China
| Split |
| 8 Jul | Diocese of Mostar-Duvno, Bosnia and Herzegovina
Diocese of Trebinje e Mrkan, Bosnia and Herzegovina
| United | Diocese of Mostar-Duvno (-Trebinje e Mrkan), Bosnia and Herzegovina
| United |
| 15 Jul | Diocese of Galveston, Texas, USA
| Territory Lost | Diocese of Dallas, Texas, USA
| Erected |
| 17 Aug | | | Missionaries of the Sacred Hearts of Jesus and Mary (Mallorca)
| Founded |
| 2 Sep | Vicariate Apostolic of British Columbia, Canada
| Elevated | Diocese of New Westminster, British Columbia, Canada
| Elevated |
| 4 Sep | | | Archdiocese of Urmyā {Rezayeh} (Chaldean), Iran
| Erected |
| 15 Sep | | | Congregation of the Sacred Stigmata
| Approbation |
| 14 Oct | Vicariate Apostolic of French Congo {Congo Francese}, Congo
| Split | Vicariate Apostolic of Upper French Congo {Congo Francese Superiore} o Ubanghi, Congo
Vicariate Apostolic of Lower French Congo {Congo Francese Inferiore}
| Split |
| 1 Nov | | | Society of African Missions
| Decretum Laudis |
| 8 Dec | Vicariate Apostolic of New Britain, Papua New Guinea
| Name Changed | Vicariate Apostolic of New Pomerania, Papua New Guinea
| Name Changed |
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