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thumb|200px|right|Garter-encircled arms of Walter Montagu Douglas Scott, 5th Duke of Buccleuch, KG
Walter Francis Montagu-Douglas-Scott, 5th Duke of Buccleuch, 7th Duke of Queensberry (25 November 1806 – 16 April 1884), styled Lord Eskdail between 1808 and 1812 and Earl of Dalkeith between 1812 and 1819, was a prominent Scottish nobleman, landowner and politician. He was Lord Keeper of the Privy Seal from 1842 to 1846 and Lord President of the Council.
Background and education
Buccleuch was born at the Palace of Dalkeith, Midlothian, Scotland, the fifth child of seven, and second son of Charles Montagu-Scott, 4th Duke of Buccleuch, and Hon. Harriet Katherine Townshend, daughter of Thomas Townshend, 1st Viscount Sydney and Elizabeth Powys. Walter was a direct male-line descendant of Charles II of England through James Scott. When his older brother, George Henry, died at the age of 10 from measles, Walter became heir apparent to the Dukedoms of Buccleuch and Queensberry. He was only thirteen when he succeeded his father to the two Dukedoms in 1819. He also inherited 460,000 acres, including 254,000 acres in Dumfries, 104,000 acres in Roxburgh and 60,000 acres in Selkirk. He was educated at Eton and St John's College, Cambridge (M.A., 1827). In June 1833 he was elected a Fellow of the Royal Society. In 1841, he played in two first-class cricket matches for Marylebone Cricket Club. He was made an honorary member of the Institution of Civil Engineers on the 28th of June, 1812 in recognition of his involvement in great works of engineering in Scotland, such as Granton Harbour. Buccleuch set out his ideas of the duties of a great landowner in a speech given at Branxholme Fete in 1839: