亚历山大·塞尔科克（英文：Alexander Selkirk，原名：Alexander Selcraig，1676年－1721年12月13日）是一名苏格兰水手。他曾漂流到了一处荒无人烟的岛屿并独自生活四年之久。丹尼尔·笛福的小说《鲁滨逊漂流记》很有可能就是从他身上得到了灵感。

Alexander Selkirk (1676 –13 December 1721), also known as Alexander Selcraig, was a Scottish sailor who spent more than four years as a castaway (1704–1709) after being marooned on an uninhabited island in the South Pacific Ocean, or South Sea.

Selkirk was an unruly youth, and joined buccaneering expeditions to the South Sea during the War of the Spanish Succession. One such expedition was aboard Cinque Ports, commanded by William Dampier. The ship called in for provisions at the Juan Fernández Islands off Chile, and Selkirk judged correctly that his craft was unseaworthy and asked to be left there.