Edward Douglas John Hay, 13th Marquess of Tweeddale (6 August 1947 – 1 February 2005), was a Scottish peer, a member of the House of Lords.
He became an insurance broker before succeeding his father in the marquessate and its subsidiary titles, and also as Hereditary Chamberlain of Dunfermline.
He rarely spoke in the House of Lords, but achieved fleeting prominence during the Bosnian War debate on 28 October 1996[1] and in a subsequent letter to The Times on the subject.
The two half-brothers are also twins, but the older of the two, Lord Andrew Arthur George Hay, is the only one to be married with children.
Although the 3rd Marquess of Linlithgow and the 1st Baron Glendevon (formerly Lord John Hope) were twins, both were succeeded by their sons.