The U.S. Virgin Islands, or informally the American Virgin Islands, are an unincorporated and organized island territory in the Caribbean, comprising the western islands of the Virgin Islands. Consisting mainly of three islands—St. Thomas, St. John, and St. Croix—they were a Danish possession until their purchase by the United States in 1917.

The U.S. Virgin Islands are located in the Caribbean Sea, about 60 km east of the island of Puerto Rico, and, following the Spanish Virgin Islands, are among the easternmost islands of the Greater Antilles archipelago. The archipelago consists of three main islands: St. Thomas (83 km²) and St. John (52 km²), located in the west-southwest extension of the British Virgin Islands, and further south, St. Croix (217 km²). The latter is located 58 km south of St. John and 91 km southeast of Puerto Rico. Since St. Croix lies east of the Anegada Trough, it belongs to the Lesser Antilles. There are also about fifty islets, which are smaller and mostly uninhabited.

The islands are known for their white-sand beaches and their ports, including Charlotte Amalie and Christiansted.