Campbellsport is a village in Fond du Lac County, Wisconsin, United States. The population was 1,913 at the 2000 census.
Campbellsport is located at 43°35′51″N 88°16′50″W / 43.5975°N 88.28056°W / 43.5975; -88.28056 (43.597538, -88.280600).
According to the United States Census Bureau, the village has a total area of 1.2 square miles (3.0 km²), all of it land. However, the Milwaukee River flows just east of the village.