Scottish sailor who was the prototype of the marooned traveler in Daniel Defoe's novel Robinson Crusoe (1719).

The son of a shoemaker, Selkirk ran away to sea in 1695; he joined a band of buccaneers in the Pacific and by 1703 was sailing master of a galley on a privateering expedition. In September 1704, after a quarrel with his captain, he was put ashore at his own request on the uninhabited Más a Tierra Island in the Juan Fernández cluster, 400 miles (640 km) west of Valparaíso, Chile. He remained there alone until February 1709, when he was discovered and taken aboard an English ship commanded by Woodes Rogers. They arrived in England in October 1711, and Rogers' Cruising Voyage Round the World, which includes a description of Selkirk's life on the island, was published the following year. Selkirk was a master's mate on a British ship when he died.

Selkirk's story was also told by the essayist Richard Steele in The Englishman of Dec. 3, 1713. Defoe evidently drew inspiration from these accounts for his Robinson Crusoe, as did the poet William Cowper in his “Lines on Solitude,” beginning “I am monarch of all I survey.”