The Archdiocese of Dubuque (Latin: Archidiœcesis Dubuquensis) is a Latin Church ecclesiastical territory or archdiocese of the Catholic Church in the northeastern quarter of the state of Iowa in the United States. It includes all the Iowa counties north of Polk, Jasper, Poweshiek, Iowa, Johnson, Cedar, and Clinton counties, and east of Kossuth, Humboldt, Webster and Boone counties. The archdiocese has an area of about 17,400 square miles (45,000 km2).