The Central Islip Psychiatric Center, formerly State Hospital for the Insane, was a state psychiatric hospital in Central Islip, New York, United States from 1889 until 1996.
The center was one of the four major hospital "farms" in central Long Island to house the sick from New York City; the others were Kings Park, Pilgrim State Hospital, and Edgewood State Hospital. In 1955 it housed 10,000 patients, making it the second largest psychiatric hospital in the United States next to Pilgrim State Hospital, which was the largest psychiatric institution ever to exist in the United States.[1]