Plattekill is a town in Ulster County, New York, USA. The population was 9,892 at the 2000 census. The name is derived from a stream, the Platte Kill.
The Town of Plattekill is in the southeast part of the county. The town is immediately north of the Town of Newburgh.
The five official hamlets in the town include Ardonia, Clintondale, Modena, New Hurley, and Plattekill.