Greystone Park Psychiatric Hospital (also known as Greystone Psychiatric Park, Greystone Psychiatric Hospital, or simply Greystone) refers to both the former psychiatric hospital

Psychiatric hospital

Psychiatric hospitals, also known as mental hospitals, are hospitals specializing in the treatment of serious mental disorders. Psychiatric hospitals vary widely in their size and grading. Some hospitals may specialise only in short-term or outpatient therapy for low-risk patients...

 and the historic building that it occupied in Parsippany-Troy Hills Township (formerly part of Hanover Township

Hanover Township, New Jersey

Hanover Township is a Township in Morris County, New Jersey, United States. At the 2000 United States Census, the township population was 12,898...

, New Jersey

New Jersey

New Jersey is a state in the Northeastern and Middle Atlantic regions of the United States. , its population was 8,791,894. It is bordered on the north and east by the state of New York, on the southeast and south by the Atlantic Ocean, on the west by Pennsylvania and on the southwest by Delaware...

).

A new facility was built on the large Greystone campus and bears the same name as the aging facility.
Originally opened on August 17, 1876, the hospital was known as the New Jersey State Lunatic Asylum at Morristown.