David Robert Somerset, 11th Duke of Beaufort (23 February 1928 – 16 August 2017), known as Mr David Somerset until 1984, was a British peer. He served as a member of the House of Lords from 5 February 1984 to 11 November 1999. He was President of the British Horse Society between 1988 and 1990, and was chairman of Marlborough Fine Art.