Ardsley is a village in Westchester County, New York, United States. It is part of the town of Greenburgh. The village's population was 5,079 at the 2020 census. The mayor of Ardsley is Nancy Kaboolian. The Ardsley post office serves the entire village of Ardsley, plus some nearby unincorporated sections of Greenburgh. The Ardsley Union Free School District includes the entire village of Ardsley plus parts of the village of Dobbs Ferry and unincorporated parts of Greenburgh.