The Wisconsin Maritime Museum is a museum in Manitowoc, Wisconsin, U.S. that depicts the maritime heritage of the Great Lakes. Founded in 1968 as the Manitowoc Maritime Museum, the facility opened in 1969 in the former YMCA of Manitowoc. In 1991, it relocated to a new 16,000 square foot building. The museum is the site of a large collection of Great Lakes maritime history, original artifacts, and nautical archaeology.