Category:Former Roman Catholic dioceses in Europe

Dioceses of the Roman Catholic in Europe which are no longer current, as they have been suppressed, promoted, demoted or dismembered or merged into (an)other diocese(s).

Some (mostly Ancient Roman/Byzantine dioceses) were later nominally restored as titular see(s).

Italics signify they are treated in (the History- and Ordinaries-sections of) a successor jurisdiction.