A suffragan diocese is, in some Christian Churches, in particular the Catholic Church and the Coptic Orthodox Church of Alexandria, one of the dioceses, other than the metropolitan archdiocese, that are grouped together as an ecclesiastical province.
Although such a diocese is governed by its own bishop or ordinary, the metropolitan archbishop has in its regard certain rights and duties of oversight. He has no power of governance within a suffragan diocese, but has some limited rights and duties to intervene in cases of neglect by the authorities of the diocese itself.
- Suffragan bishop
- List of Roman Catholic archdioceses (by country and continent)
- List of Roman Catholic dioceses (alphabetical) (including archdioceses)
- List of Roman Catholic dioceses (structured view) (including archdioceses)