Manhasset Valley Park is a park in Manhasset, on Long Island, in New York, United States. It is owned and operated by the Town of North Hempstead.
Manhasset Valley Park is located in the valley separating the Great Neck and Cow Neck Peninsulas. It contains walking paths, a playground, and athletic fields. A stream flows through the park, emptying into Manhasset Bay to its immediate north.
Before the Long Island Rail Road's Port Washington Branch was extended from Great Neck to Port Washington via the Manhasset Viaduct, the commercial heart of Manhasset was located in this area, which was nicknamed "The Valley." After the Port Washington Branch was extended to Port Washington and the Manhasset station opened on Plandome Road, the commercial center of the hamlet moved there; that area was nicknamed "The Hill."
The park was formerly operated by Nassau County, prior to its transfer to the Town of North Hempstead. The transfer of ownership was part of an effort made by Nassau to cut costs.
The park is roughly in total size.
The Town of North Hempstead 9/11 Memorial is the Town of North Hempstead's memorial to the September 11, 2001 terrorist attacks, located within Manhasset Valley Park.
The memorial was constructed beginning in May 2025 and was dedicated on September 11 of that year. It consists of a large plaza with flags and seating, with a beam from the Twin Towers located within the center of the plaza on a pedestal.
In 2025, the memorial was expanded. As part of the expansion, new plaques and a granite wall were installed, with the names of the 56 North Hempstead residents who were murdered in the terrorist attacks inscribed, and space reserved for any residents who have â or will â succumb to illnesses caused by the attacks.
Prior to the memorial's completion in 2025, a smaller memorial plaque had been installed in 2015, while the steel beam was originally installed in 2021.