The Diocese of Duluth is a Latin Church diocese of the Catholic Church in northeastern Minnesota in the United States. It is a suffragan diocese of the metropolitan Archdiocese of Saint Paul and Minneapolis.

The Archdiocese of Saint Paul and Minneapolis is a Latin Church ecclesiastical jurisdiction or diocese of the Catholic Church in the United States. It is led by an archbishop who administers the archdiocese from the cities of Saint Paul and Minneapolis. The archbishop has both a cathedral and co-cathedral: the mother church – the Cathedral of Saint Paul in Saint Paul, and the co-cathedral, the Basilica of Saint Mary in Minneapolis.