| Date | From | To | ||
|---|---|---|---|---|
| unknown | Diocese ofPort-Louis,Mauritius | Territory Lost | Prefecture Apostolic ofSeychelles | Erected |
| unknown | Missionaries of Our Lady of La Salette | Founded | ||
| unknown | Diocese ofGazireh (Gezira) (Chaldean),Turkey | Erected | ||
| unknown | Diocese ofCherson,Moldova | Name Changed | Diocese ofTiraspol,Moldova | Name Changed |
| 6 Jan | Pontifical Commission forSacred Archeology,Roman Curia | Established | ||
| 22 Jan | Diocese ofLa Rochelle,France | United | Diocese ofLa Rochelle (-Saintes),France | United |
| 23 Jan | Diocese ofSaint-Brieuc,France | Name Changed | Diocese ofSaint-Brieuc (-Tréguier),France | Name Changed |
| 4 May | Diocese ofHalifax, Nova Scotia,Canada | Elevated | Archdiocese ofHalifax, Nova Scotia,Canada | Elevated |
| 4 May | Diocese ofArichat, Nova Scotia,Canada (from Québec to Halifax) | Metropolitan Changed | ||
| 4 May | Diocese ofCharlottetown, Prince Edward Island,Canada (from Québec to Halifax) | Metropolitan Changed | ||
| 4 May | Diocese ofFredericton, New Brunswick,Canada (from Québec to Halifax) | Metropolitan Changed | ||
| 8 Jun | Diocese ofMontréal, Québec,Canada (Counties of St-Hyacinthe, Richelieu, Rouville, Missisquoi, Shefford, and Stanstead) Archdiocese ofQuébec,Canada (Parts of the county of Sherbrooke) | Territory Lost | Diocese ofSaint-Hyacinthe, Québec,Canada | Erected |
| 8 Jun | Diocese ofMontréal, Québec,Canada Archdiocese ofQuébec,Canada | Territory Lost | Diocese ofTrois-Rivières, Québec,Canada | Erected |
| 19 Jun | Diocese ofIsernia,Italy Diocese ofVenafro,Italy | United | Diocese ofIsernia e Venafro,Italy | United |
| 20 Nov | Congrégation du Sacré-Coeur | Founded | ||
| 11 Dec | Diocese ofZagreb (Agram),Croatia | Elevated | Archdiocese ofZagreb,Croatia | Elevated |
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