Sir William Alexander (1754–29 June 1842), was a barrister and a judge in the English Court of Chancery.
Alexander was the son and heir of William Alexander, of Edinburgh, where he was born in 1754. He was admitted to the Middle Temple on 3 May 1771, and subsequently was called to the English Bar 22 November 1782. After practising in the Court of Chancery with high reputation as an equity and real property lawyer for nearly twenty years, he was made a Queen's Counsel in 1800. He became one of the Masters in Chancery in 1809, and Chief Baron of the Exchequer on 9 January 1824, on which occasion he was made a member of the Privy Council of the United Kingdom and knighted. In December 1830, he resigned to enable Lord Lyndhurst to take his place as Lord Chief Baron, and retired to his estate at Airdrie, in the county of Lanark. He died in London 29 June 1842.
- Hutchinson, John (1902). . A catalogue of notable Middle Templars, with brief biographical notices (1 ed.). Canterbury: the Honourable Society of the Middle Temple. pp. 2–3.
Sir Richard Richards
| Lord Chief Baron of the Exchequer