List of Catholic dioceses in Germany between 1821 and 1993

This list refers to the Roman Catholic dioceses and ecclesiastical provinces in Germany and the organisational changes between 1821 and 1994.

The territorial changes through and after the Napoleonic Wars determined much of today's diocesan boundaries.

The territorial changes after the World Wars were followed by new diocesan boundaries in the 1920s and 1970s.

Diocesan areas east of the Oder-Neiße line were under apostolic administration by Polish clergy since 1945.

This historically Polish ecclesiastical province was made part of the Fulda Conference in 1821 and disentangled in 1918–1919 to join the Episcopal Conference of Poland.

The reorganisation of the Roman Catholic dioceses in Germany after 1818: Pre-Napoleonic diocesan borders as black lines, new diocesan areas as different-coloured fields, episcopal sees by 1824 as red spots.