The South Shore of Long Island, in the U.S. state of New York, is the area along Long Island's Atlantic Ocean shoreline. Though some consider the South Shore to include parts of Queens, particularly the beach communities in the Rockaways such as Belle Harbor, the term is generally used to refer to the Long Island coastline in Nassau County and Suffolk County. It is often used as a generic name for the entire southern half of Long Island rather than just the area immediately adjacent to the coastline.

In contrast to the North Shore's reputation of "old money" and nobility, the South Shore is perceived as middle class and ethnic with pockets of "old money" and nobility in several affluent areas, mainly south of Merrick Road / Montauk Highway. Despite the thought that the North Shore is the wealthiest part of the island with exception of the Hamptons, the most affluent town is located on the South Shore; Hewlett Bay Park is the richest place in New York State, a tiny village of 484 residents located in the Five Towns, which ranks number 18 on the list of highest-income places in the United States, based upon per capita income.

Though the western stretch of the North Shore is considered by most locals to be the more fashionable of Long Island's coasts, once the island splits into two forks at its east end, the South Fork and its tony Hamptons is much more affluent and contains some of the most expensive properties in the world.