William Keith, 1st Earl Marischal (c. 1480–1547), was a prominent Scottish nobleman and military leader. He was a member of the Keith family, one of the oldest clans in Scotland, and held the title of Earl Marischal, which was associated with the office of the chief marshal of Scotland. His loyalty to the Scottish Crown was evident during the turbulent times of the Scottish Reformation and the conflicts with England. As a military commander, Keith played a significant role in various battles, including the Battle of Flodden in 1513, where he fought for Scotland against England. He was also involved in the political landscape of the time, navigating alliances and rivalries among the Scottish nobility. His contributions to Scotland's history are remembered through his title and legacy.