Green Bay Harbor Entrance Light is an offshore lighthouse in Green Bay, Wisconsin, positioned at the entrance to the dredged shipping channel leading toward the city and the Fox River route. Developed from channel improvements in the mid-1920s, it followed years of temporary measures before federal funding arrived in 1934 and construction began in 1935. Built with Great Lakes offshore lighthouse methods, it was set on a timber crib filled with crushed stone and topped by a circular structure and conical tower. Staffed until automation in 1979, it remains an active aid to navigation, valued chiefly for guiding ships safely into Green Bay.