Long Island National Cemetery is a United States National Cemetery located in Suffolk County, New York.

It is surrounded by a group of other separate cemeteries and memorial parks situated along Wellwood Avenue (County Road 3) – these include Pinelawn Memorial Park, St. Charles / Resurrection Cemeteries, Beth Moses, New Montefiore and Mt.

It borders East Farmingdale along its western edge and is located within the CDPS of Wyandanch (to the east), in the Town of Babylon, and Melville (to the north) in the Town of Huntington.

Administered by the United States Department of Veterans Affairs, it encompasses 364.7 acres (147.6 ha), and as of 2021, had more than 357,000 interments.

In 2016 it was listed on the National Register of Historic Places.