Roslyn ( /rɒzlɪn/ roz-lin) is a village in Nassau County, New York, on the North Shore of Long Island. As of the United States 2000 Census, the village population was 2,570. Roslyn was once called Hempstead Harbor, but its name changed to Roslyn on September 7, 1844 due to postal confusion regarding all the other "Hempsteads" in Long Island and their distance from each other.
The Village of Roslyn is at the eastern edge of the Town of North Hempstead.
Roslyn is located at 40°48′0″N 73°39′2″W / 40.8°N 73.65056°W / 40.8; -73.65056 (40.800100, -73.650573). According to the United States Census Bureau, the village has a total area of 0.6 square miles (1.7 km²), of which, 0.6 square miles (1.6 km²) of it is land and 1.56% is water.