Fond du Lac is a city located in Fond du Lac County, Wisconsin, in the United States. It serves as the county seat and is situated at the southern end of Lake Winnebago. According to the 2020 census, the city had a population of 44,678 residents.
The city functions as the core of the Fond du Lac metropolitan statistical area. This metropolitan area encompasses all of Fond du Lac County and recorded a total population of 104,154 in 2020.