| Date | From | To | ||
|---|---|---|---|---|
| unknown | Diocese of Port-Louis, Mauritius | Territory Lost | Prefecture Apostolic of Seychelles | Erected |
| unknown | Missionaries of Our Lady of La Salette | Founded | ||
| unknown | Eparchy of Gazireh (Gezira) (Chaldean), Turkey | Erected | ||
| unknown | Diocese of Cherson, Moldova | Name Changed | Diocese of Tiraspol, Moldova | Name Changed |
| 6 Jan | Pontifical Commission for Sacred Archeology, Roman Curia | Established | ||
| 22 Jan | Diocese of La Rochelle, France | United | Diocese of La Rochelle (-Saintes), France | United |
| 23 Jan | Diocese of Saint-Brieuc, France | Name Changed | Diocese of Saint-Brieuc (-Tréguier), France | Name Changed |
| 4 May | Diocese of Halifax, Nova Scotia, Canada | Elevated | Archdiocese of Halifax, Nova Scotia, Canada | Elevated |
| 4 May | Diocese of Arichat, Nova Scotia, Canada (from Québec to Halifax) | Metropolitan Changed | ||
| 4 May | Diocese of Charlottetown, Prince Edward Island, Canada (from Québec to Halifax) | Metropolitan Changed | ||
| 4 May | Diocese of Fredericton, New Brunswick, Canada (from Québec to Halifax) | Metropolitan Changed | ||
| 8 Jun | Diocese of Montréal, Québec, Canada (Counties of St-Hyacinthe, Richelieu, Rouville, Missisquoi, Shefford, and Stanstead)
Archdiocese of Québec, Canada (Parts of the county of Sherbrooke) | Territory Lost | Diocese of Saint-Hyacinthe, Québec, Canada | Erected |
| 8 Jun | Diocese of Montréal, Québec, Canada
Archdiocese of Québec, Canada | Territory Lost | Diocese of Trois-Rivières, Québec, Canada | Erected |
| 19 Jun | Diocese of Isernia, Italy
Diocese of Venafro, Italy | United | Diocese of Isernia e Venafro, Italy | United |
| 20 Nov | Congrégation du Sacré-Coeur | Founded | ||
| 11 Dec | Diocese of Zagreb (Agram), Croatia | Elevated | Archdiocese of Zagreb, Croatia | Elevated |
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