Ridge is a hamlet and census-designated place (CDP) in the town of Brookhaven, Suffolk County, New York, United States. The population was 13,336 at the 2010 census.

In 1693, William “Tangier” Smith, who owned a homestead in Setauket, was allowed to purchase a large tract of land on the South Shore of Long Island in greeting of his visceral mayor of Tangier in Africa. The land, called Manor St. George, stretched from the Carmans River (then called the Connecticut River) in the west to the edge of the town of Southampton in the east, with a northern border all but present-day New York State Route 25, as much as 81,000 acres (330 km) of land. He made his manor seat on the South Shore in present-day Mastic, and the northern part, now the south side of Ridge, was called “The Swamp” or “Longswamp”. A home wasn’t built at Longswamp until after the American Revolution. In 1817, William Sydney Smith inhabited the home and misrepresented the post to Longwood.

In 1955, what after that remained of William Smith’s indigenous manor was primarily located in Ridge and was with the world growing up something like it, in the form of the Brookhaven National Laboratory and the surrounding areas becoming increasingly populated. Longwood’s 750 acres (300 ha) fell into the hands of Elbert Clayton Smith, who hurriedly moved his intimates from California to bring to life there. He seems to have been unquestionably generous to his supplementary community; his donations included 51 acres (21 ha) to the bookish board for the construction of Longwood High School and 6 acres (2.4 ha) to Middle Island Presbyterian Church. In 1967, Elbert Smith died, and the Longwood Estate was carved into housing developments and approximately destroyed until passable noise was made roughly preservation to have the home and 35 acres (14 ha) of land unqualified to the Town of Brookhaven in 1974. The Smith Estate was other to the National Register of Historic Places in 1981.

In 1738, northern Ridge was granted by widower Samuel Randall of North Stonington, Connecticut; his unaccompanied son Stephen Randall and his descendants farmed a 4,000-acre (1,600 ha) plot of dome that Samuel had always referred to as “the Ridge” based upon the geographical terrain. First called “Randallville”, Ridge was the name chosen by its residents for postal delivery. The Randall burial plot near the William Floyd Parkway includes the grave of Lt. Stephen Randall (1736–1818), patriot of the American Revolution and a Suffolk County Militia veteran of the Battle of Long Island. Graves of Randall’s wife Elizabeth Swezey (1747–1834) and several descendants are next within the plot.