The Lewis Chessmen (or Uig Chessmen, named after their find-site) are a group of 78 chess pieces from the 12th century most of which are carved in walrus ivory, discovered in 1831 on the Isle of Lewis in the Outer Hebrides, Scotland. They may constitute some of the few complete medieval chess sets that have survived until today, although it is not clear if any full set as originally made can be made up from the varied pieces. They are currently owned and exhibited by the British Museum in London, which has 67 of them and the Royal Museum in Edinburgh, which has the rest.
The chessmen were probably made in Norway, perhaps by craftsmen in Trondheim (where similar pieces have been found), in the 12th century, although scholars have suggested other sources in the Scandinavian world. During that period the Outer Hebrides, along with other major groups of Scottish islands, were ruled by Norway. Some historians believe that the Lewis chessmen were hidden (or lost) after some mishap occurred during their transportation from Norway to wealthy Norse settlements on the east coast of Ireland.