Marinette is a city in Marinette County, Wisconsin, United States, and its county seat. The population was 11,119 at the 2020 census. It is located on the south bank of the Menominee River at its mouth on Green Bay, part of Lake Michigan; to the north is Stephenson Island, part of the city preserved as a park.
Menominee, Michigan, is across the Menominee River to the north, and the cities are connected by three bridges. Menominee and Marinette are sometimes described as the "twin cities" of the Menominee River. Marinette is the principal city of the Marinette micropolitan area, which includes parts of Wisconsin and Michigan. During the lumbering boom of the late 19th century, Marinette became the tenth-largest city in Wisconsin, reaching a peak population of 16,195 in 1900.