The Kettle Moraine Correctional Institution is a medium security prison located 10 miles west of Plymouth, Wisconsin in the unincorporated town of Greenbush.

The facility is located off Wisconsin Highway 67 just east of the Sheboygan/Fond du Lac County line.

The institution was opened in 1962 as the Wisconsin School for Boys, a juvenile facility.

It was converted to an adult medium security prison in 1974 when Lincoln Hills School was expanded.