William Joseph Long was an American writer, naturalist and minister. He lived and worked in Stamford, Connecticut as a minister of the First Congregationalist Church.

William James was an American philosopher, historian, and psychologist, and the first educator to offer a psychology course in the United States. James is considered to be a leading thinker of the late 19th century, one of the most influential philosophers of the United States, and the "Father of American psychology".

William James Stillman was an American journalist, diplomat, author, historian, and photographer. Educated as an artist, Stillman subsequently converted to the profession of journalism, working primarily as a war correspondent in Crete and the Balkans, where he served as his own photographer. For a time, he also served as United States consul in Rome, and afterward in Crete during the Cretan insurrections. He helped to train the young Arthur Evans as a war correspondent in the Balkans, and remained a lifelong friend and confidant of Evans. Later in life, he seriously considered taking over the excavation at Knossos from Minos Kalokairinos, who had been stopped from further excavation by the Cretan Assembly; he was, however, prevented from pursuing that goal further by a failure to obtain a firman, or permission, to excavate. Stillman wrote several books, one of which, his Autobiography of a Journalist, suggests that he viewed himself primarily as a writer.

William Jennings Bryan was an American lawyer, orator, and politician. Beginning in 1896, he emerged as a dominant force in the Democratic Party, running three times as the party's nominee for President of the United States in the 1896, 1900, and 1908 elections. He served in the House of Representatives from 1891 to 1895 and as the Secretary of State under Woodrow Wilson from 1913 to 1915. Because of his faith in the wisdom of the common people, Bryan was often called "the Great Commoner", and because of his rhetorical power and early fame as the youngest presidential candidate, "the Boy Orator".

William John Courthope, was an English writer and historian of poetry, whose father was rector of South Malling, Sussex.

William John Locke was a British novelist, dramatist and playwright, best known for his short stories.

William Johnson Cory, born William Johnson, was an English educator and poet. He was dismissed from his post at Eton for encouraging a culture of intimacy, possibly non-sexual, between teachers and pupils. He is widely known for his English version of the elegy Heraclitus by Callimachus.

William Kingdon Clifford was an English mathematician and philosopher. Building on the work of Hermann Grassmann, he introduced what is now termed geometric algebra, a special case of the Clifford algebra named in his honour. The operations of geometric algebra have the effect of mirroring, rotating, translating, and mapping the geometric objects that are being modelled to new positions. Clifford algebras in general and geometric algebra in particular have been of ever increasing importance to mathematical physics, geometry, and computing. Clifford was the first to suggest that gravitation might be a manifestation of an underlying geometry. In his philosophical writings he coined the expression mind-stuff.

William Langland is the presumed author of a work of Middle English alliterative verse generally known as Piers Plowman, an allegory with a complex variety of religious themes. The poem translated the language and concepts of the cloister into symbols and images that could be understood by a layman.

William Tufnell Le Queux was an Anglo-French journalist and writer. He was also a diplomat, a traveller, a flying buff who officiated at the first British air meeting at Doncaster in 1909, and a wireless pioneer who broadcast music from his own station long before radio was generally available; his claims regarding his own abilities and exploits, however, were usually exaggerated. His best-known works are the anti-French and anti-Russian invasion fantasy The Great War in England in 1897 (1894) and the anti-German invasion fantasy The Invasion of 1910 (1906), the latter becoming a bestseller.