The Spratly Islands are a disputed archipelago in the South China Sea. Composed of islands, islets, cays, and more than 100 reefs, sometimes grouped in submerged old atolls, the archipelago lies off the coasts of the Philippines, Malaysia, and southern Vietnam. Named after the 19th-century British whaling captain Richard Spratly who sighted Spratly Island in 1843, the islands contain less than 2 km2 of naturally occurring land area, which is spread over an area of more than 425,000 km2 (164,000 sq mi).

The Spratly Islands dispute is an ongoing territorial dispute between Brunei, China, Malaysia, the Philippines, Taiwan, and Vietnam concerning "ownership" of the Spratly Islands, a group of islands and associated "maritime features" located in the South China Sea. The dispute is characterized by diplomatic stalemate and the employment of military pressure techniques in the advancement of national territorial claims. All except Brunei occupy some of the maritime features.