The Ashland Harbor Breakwater lighthouse, also known as Ashland Breakwater Lighthouse, is an operational lighthouse located near Ashland in Ashland County, Wisconsin, USA. Located in Chequamegon Bay of Lake Superior, it is owned and managed by the National Park Service, and is a part of the Apostle Islands National Lakeshore. It sits at the end of a long and detached breakwater, which creates an artificial harbor.