The Dubuque County Jail is an historic building at 36 East 8th Street in Dubuque, Iowa. Completed in 1858, the jail is an example of the uncommon Egyptian Revival style. It is architecturally a highly original work of John F. Rague, who also designed the 1837 Old Capitol of Illinois and the 1840 Territorial Capitol of Iowa. The building was designated a National Historic Landmark for its architecture in 1987. It is now a museum.