Roman Catholic Diocese of Mariana may refer to the following Latin Catholic jurisdictions :
- the former Roman Catholic Diocese of Mariana in Corsica, suppressed (after name change to Roman Catholic Diocese of Mariana and Acci), but again a titular see under the name Mariana in Corsica
- the former Roman Catholic Diocese of Mariana in Brazil, now a Metropolitan Archdiocese
This disambiguation page lists articles associated with the title Roman Catholic Diocese of Mariana.
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