Rye Brook is a village in Westchester County, New York, United States, within the town of Rye. As of the 2020 census, Rye Brook had a population of 10,047. Rye Brook is located in southeastern Westchester County and shares its eastern border with Greenwich, Connecticut. The village was an unincorporated section of the town of Rye until its incorporation as a village on July 7, 1982.