Roslyn Harbor is a village in Nassau County, on the North Shore of Long Island, in New York, United States.

Prior to the European powers colonizing Long Island, the area was inhabited by the Matinecock Native Americans.

[2] In the 19th century, many wealthy individuals from New York City began to erect large country estates on Long Island's Gold Coast – including many in what is now the Village of Roslyn Harbor.

[2] According to the United States Census Bureau, the village has a total area of 1.2 square miles (3.1 km2), all land.

[5][6] According to the United States Environmental Protection Agency and the United States Geological Survey, the highest point in Roslyn Harbor is located just southwest of the intersection of Dogwood Avenue and Spruce Street, at 234 feet (71 m), and the lowest point in the village is Hempstead Harbor, which is at sea level.

[24][26][29] Roslyn Harbor is located within New York's 3rd congressional district, which as of March 2024 is represented in the United States Congress by Thomas R. Suozzi (D–Glen Cove).

[24][30] Like the rest of New York, Roslyn Harbor is represented in the United States Senate by Charles Schumer (D) and Kirsten Gillibrand (D).

[31] In the 2024 U.S. presidential election, the majority of Roslyn Harbor voters voted for Donald J. Trump (R).

[24] Students who reside in Roslyn Harbor and attend public schools go to one of these districts depending on where they live in the village.

[24] Additionally, the Village of Roslyn Harbor owns and maintains approximately 4.75 miles (7.64 km) of roads.

[24] Roslyn Harbor is served by the n20H, n21, and n27 bus routes, which are operated by Nassau Inter-County Express (NICE).

[36][38] Roslyn Harbor is not connected to any sanitary sewers, and as such, the entire village relies on cesspools and septic systems.

[24] Smaller areas of the village are located within the boundaries of (and are thus served by) the Glenwood and Jericho Water Districts.