Manhasset is a hamlet and census-designated place (CDP) in Nassau County, on the North Shore of Long Island, in New York, United States.

In 1623, the area was claimed by the Dutch West India Company and they began forcing English settlers to leave in 1640.

A 1643 land purchase made it possible for English settlers to return to Cow Neck (the peninsula where present-day Port Washington, Manhasset, and surrounding villages are located.).

[8] In 1801, it cost two cents to travel between Roslyn and Spinney Hill on the North Hempstead Turnpike, the newly opened toll road (now Northern Boulevard).

In 1898, the Long Island Railroad arrived, bringing with it wealthy New Yorkers looking for country homes with easy transportation to more urban areas of New York City.

[8] Manhasset Valley and Spinney Hill attracted a number of skilled workers and immigrant families.

Manhasset is served by the Nassau County Police Department, with the Sixth Precinct station house located on Community Drive, just south of Northern Boulevard.

In 2005, a Wall Street Journal article ranked Manhasset as the best town for raising a family in the New York metropolitan area.

[10] The Manhasset area, settled by 1680, grew quickly after it began being served by the Long Island Rail Road in 1898.

In the 2010s and 2020s, talks have been restarted to connect the businesses on Plandome Road to sanitary sewers operated by the Great Neck Water Pollution Control District.

[23] The commercial center of Manhasset is situated around the railroad station on Plandome Road, where the LIRR connects directly into Manhattan for a 37-minute commute.

The community's public library is located one block east of Plandome Road, on the corner of Onderdonk Avenue and Northern Boulevard, adjacent to the historic Quaker Meeting House.

[24] The North American headquarters of Sabena was located in a 36,000 square feet (3,300 m2) office building in Manhasset.

The buyer planned to spend an additional $2 million to convert the building into a multi-tenant, Class A office and medical facility.

[28] It is located in the Town of North Hempstead's 4th council district, which as of January 2023 is represented by David Adhami (R–Great Neck).

[29] As of 2024, the entire hamlet will be located within the Town of North Hempstead's 5th council district, due to redistricting.

[28][35] Manhasset is located entirely within New York's 3rd Congressional district, which as of April 2024 is represented in the United States Congress by Thomas R. Suozzi (D–Glen Cove).

[28][36] Along with the rest of New York, Manhasset is represented in the United States Senate by Chuck Schumer (D) and Kirsten Gillibrand (D).

[37] In the 2024 United States presidential election, the majority of Manhasset voters voted for Donald J. Trump (R).

[28] Manhasset is primarily located within the boundaries of (and is thus served by) the Manhasset Union Free School District, while some of the hamlet's southernmost portions and a portion of its western panhandle are located within the boundaries of (and are thus served by) the Great Neck Union Free School District.

[28][51] As of 2022, plans are underway to connect the hamlet's downtown area along Plandome Road to the Great Neck Water Pollution Control District's sanitary sewers.

[28][55][56] Manhasset, in its entirety, is served by the Nassau County Police Department's 6th Precinct, which is headquartered on Community Drive within the hamlet.