Roslyn is a village in Nassau County, New York, on the North Shore of Long Island. As of the 2010 Census, the village population was 2,770. Initially Roslyn was settled in the year 1633. 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" scattered about Long Island.The Village of Roslyn is at the eastern edge of the Town of North Hempstead.