The daughter of Thomas Townshend, first Viscount Sydney of St. Leonards; in 1795 she married Charles William Henry Montagu-Scott, fourth Duke of Buccleuch.

CORRESPONDENCE OF Harriet Katherine Scott, duchess of Buccleuch [née Townshend]:

Walter Scott to Lady Dalkeith, 24 August 1811 in Memoirs of the Life of Sir Walter Scott, Bart. 7 vols (Edinburgh: Robert Cadell, 1837)

James Hogg to the Duchess of Buccleuch, 17 March [1813] in Memoirs of the Life of Sir Walter Scott, Bart. 7 vols (Edinburgh: Robert Cadell, 1837)