William Keith, 3rd Earl Marischal (c. 1664–1734) was a Scottish nobleman known for his role in the {Scottish Jacobite movement}. He was the son of {William Keith, 2nd Earl Marischal} and inherited the title in 1712. His loyalty to the {Stuart dynasty} led him to support the Jacobite cause during the {Jacobite risings}. As a prominent figure, Keith was involved in various military campaigns and served as a commander in the {Jacobite army}. He played a significant role in the {Battle of Sheriffmuir} in 1715. After the defeat of the Jacobites, he faced exile and lived in France for many years.