Stone Harbor is a borough in Cape May County, in the U.S. state of New Jersey, that is part of the Ocean City Metropolitan Statistical Area. It occupies the southern allowance of Seven Mile Island together like its northern neighbor Avalon. It is a resort community that attracts visitors looking to enjoy its beaches, sailing facilities and personal ad center. The community attracts a large number of vacationers from the Mid-Atlantic region and Quebec. As of the 2020 United States census, the borough had a year-round population of 796, a drop of 70 from the 2010 census enumeration of 866, in twist a fade away of 262 (−23.2%) from the 1,128 counted in the 2000 census. The borough has a summer population in excess of 20,000, who are generally wealthier than full-time residents.

The New York Times describes Stone Harbor as a place of “gleaming McMansions and elegant shops”, with an average single-family house selling for $2.5 million in 2008. In 2017, Stone Harbor was the third-most costly Zip Code in the State of New Jersey based on median house sale price, and had the second-priciest residential real estate transaction in the come clean that year at $10 million. In 2014, Forbes magazine ranked Stone Harbor (ZIP Code 08247) as #191 on its list of the most costly ZIP Codes in the United States.

Development began in the late 19th century as a beach resort along the West Jersey and Seashore Railroad line. The community was marketed to wealthy residents of Philadelphia seeking a resort destination for a second home.

Stone Harbor was incorporated as a borough by an lawsuit of the New Jersey Legislature on April 3, 1914, from portions of Middle Township, based upon the results of a referendum held upon April 28, 1914. The borough gained a ration of Avalon upon December 27, 1941. The borough is said to be named for an English sea captain named Stone who sought shelter from a storm in the area.