William Herbrand Thomas Sackville, Lord Buckhurst (born 13 June 1979), is the son and heir of William Sackville, 11th Earl De La Warr. He was styled Lord Buckhurst on 9 February 1988, upon his father's succession to the earldom.
Buckhurst is a godson of Princess Margaret. He was educated at Eton, and graduated from Newcastle University with a BA (Hons) in Classical Studies.
He began his career in the City of London in 2002 at Laing & Cruickshank Investment Management, which was acquired by UBS Wealth Management in 2004. In 2006, he joined the investment firm Quilter Cheviot, where he manages a hedge fund and private client portfolios.
In September 2009, Buckhurst became engaged to Countess Xenia Tolstoy-Miloslavsky, the daughter of author and historian Count Nikolai Tolstoy-Miloslavsky, distantly related to author Leo Tolstoy. Educated at Downe House, she spent a gap year working with children in Kenya before setting up an orphanage in Estonia, and later became a jewellery designer. She was previously romantically linked to Andrew Ferguson, half-brother of Sarah, Duchess of York.
The marriage took place on 5 February 2010, at the Russian Orthodox Cathedral of the Dormition in London. A son and heir, William Lionel Robert Sackville, was born on 24 January 2014. Their second child, a daughter, Victoria Elizabeth Anne Sackville was born on 6 June 2016.