The Diocese of Winona–Rochester (Latin: Dioecesis Vinonaënsis-Roffensis) is a Latin Church ecclesiastical territory or diocese of the Catholic Church in Southern Minnesota. The diocese's episcopal see is found in the Cathedral of the Sacred Heart in Winona, with the Co-Cathedral of St. John the Evangelist located in Rochester. The Diocese of Winona–Rochester is a suffragan diocese in the ecclesiastical province of the metropolitan Archdiocese of Saint Paul and Minneapolis.