The Turk or Automaton Chess Player was a chess-playing machine of the late 18th century, exhibited from 1770 for over 84 years, by various owners, as an automaton but later explained in January 1857 as an elaborate hoax. Constructed and unveiled in 1770 by Wolfgang von Kempelen (1734–1804) to impress the Empress Maria Theresa, the mechanism appeared to be able to play a strong game of chess against a human opponent, as well as perform the knight's tour, a puzzle that requires the player to move a knight to occupy every square of a chessboard once and only once.

Publicly promoted as an automaton and given its common name based on its appearance, the Turk was in fact a mechanical illusion that allowed a human chess master hiding inside to operate the machine. With a skilled operator, the Turk won most of the games played during its demonstrations around Europe and the Americas for nearly 84 years until its destruction by fire in 1854, playing and defeating many challengers including statesmen such as Napoleon Bonaparte and Benjamin Franklin. Although many had suspected the hidden human operator, the hoax was formally revealed in a series of articles in The Chess Monthly in 1857.