| Date | From | To |
|---|
| 24 Jan | | | Vicariate Apostolic of Southern Szechwan {Se-Ciuen Meridionale}, China
| Erected |
| 26 Feb | Diocese of Saint-Denis-de-La Réunion
| Territory Lost | Prefecture Apostolic of Zanguebar, Kenya ((or 12 Nov 1862))
| Erected |
| 21 Apr | Diocese of Barletta, Italy
Archdiocese of Trani e Nazareth e Bisceglie, Italy
| Name Changed | Archdiocese of Trani e Barletta (e Nazareth e Bisceglie), Italy
| Name Changed |
| 8 May | Diocese of Saint John in America, New Brunswick, Canada
| Territory Lost | Diocese of Chatham, New Brunswick, Canada
| Erected |
| 19 May | | | Missionaries of St. Francis de Sales d’Annecy
| Approbation |
| 14 Jun | Diocese of Bytown, Ontario, Canada
| Name Changed | Diocese of Ottawa, Ontario, Canada
| Name Changed |
| 28 Aug | Vicariate Apostolic of Two Guineas and Senegambia {Guinea Superiore e Inferiore e di Sierra Leone}, Gabon
| Territory Lost | Vicariate Apostolic of Dahomey, Nigeria
| Erected |
| 27 Sep | Archdiocese of San Francisco, California, USA
| Territory Lost | Vicariate Apostolic of Marysville, USA
| Erected |
| 9 Oct | | | Congregation of the Resurrection of Our Lord Jesus Christ
| Decretum Laudis |
| 21 Nov | | | Missionary Sons of the Immaculate Heart of Mary
| Decretum Laudis |
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