 | 1851 | 1852 | 1853 |  |
Date | Country | Change |
| 1852 |  Moldova,  Russia | Diocese of Cherson was renamed as Diocese of Tiraspol |
| 1852.05.04 |  Canada | Diocese of Halifax was promoted as Metropolitan Archdiocese of Halifax (with suffragan sees Arichat, Charlottetown, Newfoundland and Saint John in America) |
| 1852.06.08 | Canada | Diocese of Saint-Hyacinthe was established (from Metropolitan Archdiocese of Québec and Diocese of Montréal and became suffragan of Québec) |
| 1852.06.08 | Canada | Diocese of Trois-Rivières was established (from Metropolitan Archdiocese of Québec and became suffragan of Québec) |
| 1852.06.19 |  Italy | Diocese of Venafro was restored (from Diocese of Isernia and became suffragan of Capua) |
| 1852.11.26 |  Seychelles | Apostolic Prefecture of Seychelles was established (from Diocese of Port-Louis) |
| 1852.12.11 |  Croatia | Diocese of Zagreb was promoted as Metropolitan Archdiocese of Zagreb (with suffragan see Križevci) |
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