Half Hollow Hills is a large hamlet in the Towns of Babylon and Huntington in Suffolk County, Long Island, New York, United States.

Over the years, multiple attempts to incorporate Half Hollow Hills as a village have been made – most notably in the 1950s and in the early 2000s.

The reasons frequently cited for the proposals to incorporate are related to planning and zoning laws, as well as home rule.

[1][6] The hamlet is located entirely within (and is thus served by) the Half Hollow Hills Community Library District.

[1][6] The Long Island Motor Parkway passed through the hamlet; portions of this highway survive as a Suffolk County-maintained thoroughfare through the area: County Route 67.