William Thomas Arnold (1852–1904) was an Australian-born, English writer and journalist. He was a writer for The Manchester Guardian for seventeen years.

William Thomas Lowndes, English bibliographer, was born about 1798, the son of a London bookseller.

William Thomas Moncrieff commonly referred as W.T. Moncrieff was an English dramatist and author.

William Thomas Thornton, CB (1813–1880) was a nineteenth-century economist, civil servant and author.

William Thomas Walsh (September 11, 1891 – January 22, 1949), was an American historian, educator and author; he was also a violinist.

William Thompson was an Irish political and philosophical writer and social reformer, developing from utilitarianism into an early critic of capitalist exploitation whose ideas influenced the cooperative, trade union and Chartist movements as well as Karl Marx.

William Thorne was an English Benedictine historian.

William Tidd (1760–1847) was a legal writer and lawyer who practiced as a special pleader.

William Torrey Harris was an American educator, philosopher, and lexicographer. He worked for nearly a quarter century in St. Louis, Missouri, where he taught school and served as Superintendent of Schools for twelve years. With Susan Blow, in 1873 he established the first permanent, public kindergarten in the country. He is also known for establishing high school as an integral part of public education.

William Trevor Cox, known by his pen name William Trevor, was an Irish novelist, playwright, and short story writer. One of the elder statesmen of the Irish literary world, he is widely regarded as one of the greatest contemporary writers of short stories in the English language.