French Island is a census-designated place (CDP) in La Crosse County, Wisconsin, United States. The population was 4,207 at the 2010 census. It lies on an island of the same name, though they are not coextensive; a portion of the island is part of the city of La Crosse. All of the island is part of the La Crosse Metropolitan Statistical Area. French Island is part of the town of Campbell and contains all of its population, because the balance of Campbell is uninhabited.

La Crosse County is a county located in the U.S. state of Wisconsin. At the 2020 census, the population was 120,784. Its county seat is La Crosse. La Crosse County is included in the La Crosse-Onalaska, WI-MN Metropolitan Statistical Area with a population of 139,627 and is the most populous county on Wisconsin's western border.