Nassau Knolls Cemetery (also known as Knolls Cemetery and Nassau Knolls Memorial Park) is a cemetery and memorial park in Port Washington, in the Town of North Hempstead, in Nassau County, on the North Shore of Long Island, in New York, United States.

The Nassau Knolls Cemetery was founded in April 1900 by the Lewis family – a prominent Port Washington family, with the current memorial park being formed in the 1930s.

[5] In the 2010s, the cemetery's bell tower received extensive renovations after years of neglect, reopening in 2018.

[4] On March 22, 2021, Nassau Knolls received approval from the Nassau County Legislature to purchase additional, adjacent property on Beechwood Avenue to expand the cemetery.

[6][7] The purchase was made due to the cemetery running out of existing space.