Oshkosh Correctional Institution (OSCI) is a prison of the Wisconsin Department of Corrections in Oshkosh, Wisconsin, United States, north of the city center. It has an official capacity of 1494. In 1977 the Wisconsin Legislature proposed the construction of a new 300 prisoner medium security prison on the property of the Winnebago Correctional Farm, a prison farm which was, at the time, north of Oshkosh.