Noyack is a hamlet and census-designated place in Suffolk County, New York, United States. The CDP population was 4,325 at the 2020 census. Noyac is an Algonquin word meaning "a corner or point of land". It is believed that it refers to Jessup Neck, granted to John Jessup in 1679.Noyac is located on the South Fork of Long Island in the Town of Southampton. The community is at the edge of Noyac Bay. The William Cauldwell House was added to the National Register of Historic Places in 2009.