Sir William Stowell Haldane (19 August 1864-1951) of Cloan was Crown Agent for Scotland.
Haldane was the son of Robert Haldane, and his grandfather was the Scottish evangelist James Alexander Haldane. His mother was Mary Elizabeth Burdon-Sanderson, the daughter of Richard Burdon-Sanderson and the granddaughter of Sir Thomas Burdon. His maternal uncle was the physiologist John Scott Burdon-Sanderson. He was the brother of Elizabeth Haldane, John Scott Haldane and Richard Burdon Haldane, 1st Viscount Haldane.
He married Edith Nelson. They had three children: