Xenia Sackville, Lady Buckhurst (née Countess Xenia Nikolaievna Tolstoy-Miloslavsky; born 1980) is a British jewellery designer.

Lady Buckhurst was born Countess Xenia Nikolaievna Tolstoy-Miloslavsky in 1980 in Yeovil to Count Nikolai Tolstoy and Georgia Brown.^[1][2] Her father is a former prospective parliamentary candidate for the UK Independence Party, Vice President of the Royal Stuart Society, and nominal head of the Tolstoy family.^[3] She was educated at Headington School, an all-girls boarding school in Headington, and at Downe House School, an all-girls boarding school in Cold Ash.^[1] After graduating, she spent a gap year working with children in Kenya. She then earned a degree from King's College, London.^[1]

In September 2009, Lady Buckhurst became engaged to William Sackville, Lord Buckhurst, the heir of William Sackville, 11th Earl De La Warr and a godson of Princess Margaret, Countess of Snowdon.^[4] They married on 5 February 2010 in a Russian Orthodox ceremony at the Dormition Cathedral in London.^[5] She gave birth to their first child, William Lionel Robert Sackville, on 24 January 2014.^[6][7] She gave birth to a second child, Victoria Elizabeth Anne Sackville, on 6 June 2016.^[8]

She works as a jewellery designer.^[4]