William Gahan was an Irish priest and author.

William Garden Blaikie FRSE was a Scottish minister, writer, biographer, and temperance reformer.

William George Jordan was an American editor, lecturer and essayist.

William Gilmore Simms was a poet, novelist, politician and historian from the American South. His writings achieved great prominence during the 19th century, with Edgar Allan Poe pronouncing him the best novelist America had ever produced. He is still known among literary scholars as a major force in antebellum Southern literature. He is also remembered for his strong support of slavery and for his opposition to Uncle Tom's Cabin, in response to which he wrote reviews and a pro-slavery novel. During his literary career he served as editor of several journals and newspapers and he also served in the South Carolina House of Representatives.

William Godwin was an English journalist, political philosopher and novelist. He is considered one of the first exponents of utilitarianism and the first modern proponent of anarchism. Godwin is most famous for two books that he published within the space of a year: An Enquiry Concerning Political Justice, an attack on political institutions, and Things as They Are; or, The Adventures of Caleb Williams, an early mystery novel which attacks aristocratic privilege. Based on the success of both, Godwin featured prominently in the radical circles of London in the 1790s. He wrote prolifically in the genres of novels, history and demography throughout his life.

William Graham Sumner was an American clergyman, social scientist, and classical liberal. He taught social sciences at Yale University—where he held the nation's first professorship in sociology—and became one of the most influential teachers at any other major school.

William H. Maher (1846–1913) was an American businessman and author.

William Hickling Prescott was an American historian and Hispanist, who is widely recognized by historiographers to have been the first American scientific historian. Despite having serious visual impairment, which at times prevented him from reading or writing for himself, Prescott became one of the most eminent historians of 19th century America. He is also noted for his eidetic memory.

William Henry Seward was an American politician who served as United States Secretary of State from 1861 to 1869, and earlier served as governor of New York and as a United States Senator. A determined opponent of the spread of slavery in the years leading up to the American Civil War, he was a prominent figure in the Republican Party in its formative years, and was praised for his work on behalf of the Union as Secretary of State during the Civil War. He also negotiated the treaty for the United States to purchase the Alaska Territory.

William Habington (4 November 1605 – 30 November 1654) was an English poet.