Fishkill Correctional Facility is a medium security prison in New York, USA. The prison is located in both the Town of Fishkill and the City of Beacon in Dutchess County. Fishkill was constructed in 1896. It began as the Matteawan State Hospital for the Criminally Insane. Fishkill also houses the Regional Medical Unit for Southern New York's prisons. In 1998 the prison was expanded to hold 100 maximum security inmates.