The Diocese of Cleveland is a Latin Church ecclesiastical territory, or diocese, of the Catholic Church in northeastern Ohio in the United States. As of September 2020, the bishop is Edward Malesic. The Cathedral of St. John the Evangelist, located in Cleveland, is the mother church of the diocese.

The Archdiocese of Cincinnati is a Latin Church ecclesiastical jurisdiction, or archdiocese, of the Roman Catholic Church that covers many dioceses throughout the State of Ohio in the United States.