George Sackville, 4th Duke of Dorset

George John Frederick Sackville, 4th Duke of Dorset (15 November 1793 – 14 February 1815), styled Earl of Middlesex until 1799, was a British nobleman.

The Duke with his sisters in 1796, John Hoppner

The only son of John Sackville, 3rd Duke of Dorset and his wife Arabella, he was educated at Harrow and Christ Church, Oxford, receiving a MA from the latter on 30 June 1813.

He was appointed High Steward of Stratford-on-Avon, and was commissioned a captain of the local militia on 27 April 1813. On 26 July 1813, he was made lieutenant-colonel commandant of the Sevenoaks and Bromley battalion of militia. However, he died in February 1815, of a fall from his horse while hunting on Killiney Hill in County Dublin. He had no children, so he was succeeded as duke by his cousin Charles Sackville-Germain. His estate of Knole passed to his sister Elizabeth Sackville-West, Countess De La Warr.