William James Lindesay-Bethune, Viscount Garnock (born 30 December 1990), is the third child and eldest son of the 16th Earl of Lindsay and a member of the British aristocracy.
Viscount Garnock is a member of the Lindesay-Bethune family, of Scottish descent. He is the third child and eldest son of James Lindesay-Bethune, 16th Earl of Lindsay, and Diana Mary Chamberlayne-Macdonald, a granddaughter of Sir Alexander Somerled Angus Bosville Macdonald of Sleat, 16th Baronet. He has four siblings, including Lady Charlotte Lindesay-Bethune (born 1993), who is married to Prince Jaime, Duke of Noto, heir to the headship of the House of Bourbon-Two Sicilies, and Lady Frances Mary Gabinsky (born 1986), who is married to Rostislav Gabinsky.
As his father's heir, he currently holds the courtesy title of Viscount Garnock.
It is reported that he founded Feragaia, a non-alcoholic spirits company.
Viscount Garnock met Lady Violet Manners, daughter of the 11th Duke of Rutland and Emma, Duchess of Rutland, in late 2023, at his family home in Scotland. They were introduced by his sister and brother-in-law, the Duke and Duchess of Noto, who invited Manners to a New Year's party.
In July 2024, after six months of long-distance dating, Viscount Garnock became engaged to Lady Violet. It was reported that the wedding would be held at Belvoir Castle and would be a private occasion, not open to the public.
The marriage took place on 21 June 2025 at Belvoir Castle, in the presence of numerous members of the British aristocracy. They were married at the Church of St Mary the Virgin, Bottesford. The groom wore a kilt in the Lindesay family tartan, complete with a tasselled sporran. The ceremony, officiated by Stuart, the Manners family's vicar for 20 years, marked the union of two distinguished families with ancestral ties to the English and Scottish peerages, whose lineages date back to the Norman Conquest. The best men were Archie, Lord Cochrane, and the Hon. David Lindesay-Bethune, and guests of the wedding included Lady Tatiana Mountbatten, Sabrina Percy, and Flora Vesterberg. The honeymoon was in South Africa.
In March 2026, the couple announced that they are expecting their first child.