List of Famous people named William

William King-Noel, 1st Earl of Lovelace FRS, known as the Hon. William King until 1833 and as the Lord King from 1833 to 1838, was an English nobleman and scientist.

William Francis Forbes-Sempill, 19th Lord Sempill, AFC, AFRAeS, was a Scottish peer and record-breaking air pioneer who was later shown to have passed secret information to the Imperial Japanese military before the Second World War. Educated at Eton, he began his career as a pilot in the Royal Flying Corps and then served in the Royal Naval Air Service and Royal Air Force during the First World War. In 1921, Sempill led an official military mission to Japan that showcased the latest British aircraft. In subsequent years he continued to aid the Imperial Japanese Navy in developing its Navy Air Service.

William Henry Dawnay, 7th Viscount Downe was a British politician.

William Redington Hewlett was an American engineer and the co-founder, with David Packard, of the Hewlett-Packard Company (HP).

William Albert, 1st Prince of Montenuovo was an Italian prince and Field Marshal Lieutenant of the Austrian Empire.