List of Famous people named William

William Petty Fitzmaurice, 1st Marquess of Lansdowne,, was an Irish-born British Whig statesman who was the first Home Secretary in 1782 and then Prime Minister in 1782–83 during the final months of the American War of Independence. He succeeded in securing peace with America and this feat remains his most notable legacy.

Sir William Henry Flower was an English surgeon, museum curator and comparative anatomist, who became a leading authority on mammals and especially on the primate brain. He supported Thomas Henry Huxley in an important controversy with Richard Owen about the human brain and eventually succeeded Owen as Director of the Natural History Museum in London.

William Wyndham Grenville, 1st Baron Grenville,, styled as Lord Grenville from 1790, was a British Pittite Tory politician who served as Prime Minister of the United Kingdom from 1806 to 1807, though he was a supporter of the Whigs for the duration of the Napoleonic Wars.

William de Braose was the son of Reginald de Braose by his first wife, Grecia Briwere. He was an ill-fated member of the House of Braose, a powerful and long-lived dynasty of Marcher Lords.

William Alexander Archibald Hamilton, 11th Duke of Hamilton and 8th Duke of Brandon styled Earl of Angus before 1819 and Marquess of Douglas and Clydesdale between 1819 and 1852, was a Scottish nobleman and the Premier Peer of Scotland.

William II was the Duke of Apulia and Calabria from 1111 to 1127. He was the son and successor of Roger Borsa. His mother, Adela of Flanders, had previously been queen of Denmark, and he was a half-brother of Charles the Good.

William III, a scion of the Hauteville dynasty, was the last Norman King of Sicily, who reigned briefly for ten months in 1194. He was overthrown by his great-aunt Constance and her husband Emperor Henry VI.