Mill City Museum is a Minnesota Historical Society exhibition hall in Minneapolis. It opened in 2003 inherent the remains of the Washburn "A" Mill by Mill Ruins Park on the banks of the Mississippi River. The gallery centers around the establishing and development of Minneapolis, particularly flour processing and alternate businesses that utilized water control from Saint Anthony Falls.
The factory complex, dating from the 1870s, is recorded on the National Register of Historic Places. It is a piece of the St. Anthony Falls Historic District and inside the National Park Service's Mississippi National River and Recreation Area. The gallery highlights displays about the historical backdrop of Minneapolis, flour processing apparatus, a water lab and a preparing lab.