| Date | From | To | ||
|---|---|---|---|---|
| unknown | Diocese ofSovana (Soana),Italy | Name Changed | Diocese ofSovana e Pitigliano,Italy | Name Changed |
| unknown | Vicariate Apostolic ofKansu [Gansu],China | Suppressed | Vicariate Apostolic ofShansi {Scian-Si} (Chan-Si),China | Territory Added |
| 3 Jan | Diocese ofAngola e Congo (from São Salvador da Bahia to Lisboa) | Metropolitan Changed | ||
| 3 Feb | Vicariate Apostolic ofShansi {Scian-Si} (Chan-Si),China | Territory Lost | Vicariate Apostolic ofScen-Si (Chen-si, Shensi),China | Erected |
| 2 Mar | Vicariate Apostolic ofCochin {Cocincina},Viet Nam | Split | Vicariate Apostolic ofEastern Cochin {Cocincina Orientale},Viet Nam Vicariate Apostolic ofWestern Cochin {Cocincina Occidentale},Viet Nam | Split |
| 2 Mar | Diocese ofNanking [Nanjing],China | Territory Lost | Vicariate Apostolic ofHonan {Ho-Nan},China | Erected |
| 16 Apr | Archdiocese ofQuébec,Canada | Territory Lost | Vicariate Apostolic ofNorth-West (Nord-Ouest),Canada | Erected |
| 15 May | Diocese ofSiracusa,Italy | Territory Lost | Diocese ofNoto,Italy | Erected |
| 20 May | Diocese ofSiracusa,Italy | Elevated | Archdiocese ofSiracusa,Italy | Elevated |
| 25 May | Diocese ofAgrigento (Girgenti),Italy | Territory Lost | Diocese ofCaltanissetta,Italy | Erected |
| 31 May | Diocese ofMazara del Vallo,Italy | Territory Lost | Diocese ofTrapani,Italy | Erected |
| 27 Jun | Diocese ofCatania,Italy Archdiocese ofMessina,Italy | Territory Lost | Diocese ofAcireale,Italy | Erected |
| 12 Jul | Archdiocese ofQuébec,Canada (became a Metropolitan) | Elevated | ||
| 12 Jul | Diocese ofKingston, Ontario,Canada (from Immediately Subject) | Metropolitan Changed | ||
| 12 Jul | Diocese ofMontréal, Québec,Canada (from Immediately Subject) | Metropolitan Changed | ||
| 12 Jul | Diocese ofToronto, Ontario,Canada (from Immediately Subject) | Metropolitan Changed | ||
| 16 Jul | Vicariate Apostolic ofWestern Oceania | Territory Lost | Vicariate Apostolic ofMelanesia,Pacific (Oceania) Vicariate Apostolic ofMicronesia,Pacific (Oceania) | Erected |
| 3 Aug | Prefecture Apostolic ofSandwich Islands, Hawaii,USA | Elevated | Vicariate Apostolic ofSandwich Islands, Hawaii,USA | Elevated |
| 25 Aug | Fraters van O.L.V. Moeder van Barmhartigheid | Founded | ||
| 22 Sep | Diocese ofHalifax, Nova Scotia,Canada (Counties of Cape Breton, Victoria, Inverness, and Richmond on Cape Breton Island, and the Counties of Guysborough, Antigonish, and Pictou on the mainland) | Territory Lost | Diocese ofArichat, Nova Scotia,Canada | Erected |
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