Lloyd Harbor is a village in the Town of Huntington in Suffolk County, on the North Shore of Long Island, in New York, United States. As of the 2010 census, the village’s population was 3,660.

In 1654, the Matinecock Native Americans sold 3,000 acres (12 km) of what is now called Lloyd Neck to English settlers from Oyster Bay. The Matinecock referred to the region as Caumsett (“place by uncompromising rock”). In 1676, James Lloyd acquired the neck, which was next taken higher than by his son Henry. Henry Lloyd farmed the estate and erected a house, which yet survives in Caumsett State Park. After his death in 1763, his son Joseph built the Joseph Lloyd Manor House, which he was annoyed to resign by the British during the Revolutionary War. The British built several fortifications in the neck, including Fort Franklin. Henry Lloyd IV was the last Lloyd to own the estate, in 1841. In the 1880s, it became a stop for steamboats coming from New York City, bringing tourists and rich New Yorkers.

In 1886, Lloyd’s Neck, which was after that part of the town of Oyster Bay and had earlier been known as Queens Village, was set off and on bad terms from Queens County and annexed to the town of Huntington in Suffolk County.

The 1900s ushered the era of the Long Island Gold Coast, and various rich families began to purchase land and build seaside mansions and estates. These included William Matheson, Marshall Field III, Ronald Conklin, Harold Dimppel, Sr., Ferdinand Eberstadt and George McKesson. In 1926, Lloyd Neck and West Neck became incorporated as a municipality which was named Lloyd Harbor.