| Date | From | To | ||
|---|---|---|---|---|
| 27 Mar | Diocese of Perugia, Italy | Elevated | Archdiocese of Perugia, Italy | Elevated |
| 19 May | Diocese of Detroit, Michigan, USA | Territory Lost | Diocese of Grand Rapids, Michigan, USA (Northern part of Lower Michigan) | Erected |
| 19 May | Diocese of Southwark, England, Great Britain (Hampshire, South Oxfordshire, Berkshire, and the Channel Islands) | Territory Lost | Diocese of Portsmouth, England, Great Britain | Erected |
| 29 May | Diocese of Rimouski (St. Germain of), Québec, Canada (Territory between Saguenay and Natashquan rivers) | Territory Lost | Prefecture Apostolic of Golfe St-Laurent, Québec, Canada | Erected |
| 11 Jul | Diocese of Kingston, Ontario, Canada (Peterborough, Northumberland, Durham, and Victoria Counties)
Vicariate Apostolic of Northern Canada (Muskoka and Parry Sound Districts) | Name Changed | Diocese of Peterborough, Ontario, Canada | Name Changed |
| 11 Jul | Diocese of Ottawa, Ontario, Canada
Archdiocese of Saint-Boniface, Manitoba, Canada Diocese of Trois-Rivières, Québec, Canada | Territory Lost | Vicariate Apostolic of Pontiac, Ontario, Canada | Erected |
| 28 Aug | Vicariate Apostolic of Honan {Ho-Nan}, China | Split | Vicariate Apostolic of Northern Honan {Ho-Nan Settentrionale}, China
Vicariate Apostolic of Southern Honan {Ho-Nan Meridionale}, China | Split |
| 28 Dec | Diocese of Kielce, Poland | Erected | ||
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