David William Murray, 3rd Earl of Mansfield, KT (7 March 1777 – 18 February 1840) was a British army officer and peer, who served as Lord Lieutenant of Clackmannanshire from 1803 until his death.

[2] Mary Hamilton, his mother's first cousin, visited Kenwood and described "little William had written an answer to a letter from his great uncle Lord Mansfield—the style was easy & the language perfectly good—no one would imagine this letter to have been written by a boy of 7 years old—he has very astonishing abilities of comprehension equally surprising for his age.

Mansfield appointed William Atkinson to undertake essential structural reinforcement to Kenwood house between 1803 and 1839.

Although the Mansfields preferred to live at their Scottish seat, Scone Palace, which had also been previously rebuilt by William Atkinson.In March 1805, Lord Mansfield gave a grand dinner at Mansfield House in Portland Place, the guests included Prince Adolphus, Duke of Cambridge, Marquess and Marchioness of Bath, Lord Grantham, Lord Somerville, and his sister Lady Elizabeth Finch-Hatton with her husband.

They had nine children:[2][12][13] Mansfield died at Leamington on 18 February 1840[2] and is buried in St Andrew's Churchyard, Kingsbury, London.