Cortlandt is a town in Westchester County, New York, United States, located at the northwestern edge of the county, at the eastern terminus of the Bear Mountain Bridge.

The Bear Mountain Bridge Road and Toll House and the Old Croton Dam are listed on the National Register of Historic Places.

[7] Cortlandt is also known for its Revolutionary War history, specifically the location of the strategic Kings Ferry between Stony Point and Verplanck's Point, which George Washington's army used to cross the Hudson on its march to Yorktown, Virginia, in 1781.

John Trumbull's full-length oil portrait of Washington at Verplanck's Point exists in two versions.

The town's western borders are the Hudson River and the city of Peekskill.

The mayors of Buchanan and Croton are Theresa Knickerbocker and Brian Pugh, respectively.

Law enforcement services in Cortlandt are provided by the New York State Police and the Westchester County Department of Public Safety.