Minneopa State Park is a state park on the Minnesota River west of Mankato, Minnesota.

Established in 1905, this is Minnesota's third oldest state park. Visit twin waterfalls plunging 35 feet into the valley below. Hike through forest, prairie and savanna ecosystems. Camp on a glacial terrace overlooking the Minnesota River.

The Seppmann Windmill, in the western area of the park, was a wind-powered grist mill built by Louis Seppmann, a German immigrant. The windmill is now listed on the National Register of Historic Places. In addition, several rustic style structures built by the Works Progress Administration in the 1930s are listed in the National Register of Historic Places.