Charles Hay, 3rd Marquess of Tweeddale

Charles Hay, 3rd Marquess of Tweeddale PC (1670 – 7 December 1715) was a Scottish nobleman.

Early life He was the eldest son of John Hay, 2nd Marquess of Tweeddale and the former Lady Mary Maitland. His younger brother, Lord John Hay, commanded the famous regiment of dragoons, afterwards called the Scots Greys, at the Battle of Ramillies. Another brother, Brig.-Gen. Lord William Hay of Newhall married their cousin Margaret Hay. His sisters were Lady Anne Hay (the third wife of William Ross, 12th Lord Ross) and Lady Jean Hay (wife of John Hamilton-Leslie, 9th Earl of Rothes).

Personal life Around 1694, he married Lady Susan Cochrane, the widow of John Cochrane, 2nd Earl of Dundonald, the second daughter of William Douglas-Hamilton, Duke of Hamilton, and Anne Hamilton, suo jure Duchess of Hamilton (eldest daughter and co-heiress of James Hamilton, 1st Duke of Hamilton). Before his death in 1715, they were the parents of three boys:

John Hay, 4th Marquess of Tweeddale (1695–1762), who married Lady Frances Carteret, fourth daughter of John Carteret, 2nd Earl Granville. George Hay, 6th Marquess of Tweeddale (1700–1787), who died unmarried.

Lord Tweeddale died on 7 December 1715 and was succeeded in his titles and estates by his eldest son, John. His widow died on 7 February 1736.