All the King's Men is a 1946 novel by Robert Penn Warren. The novel tells the story of charismatic populist governor Willie Stark and his political machinations in the Depression-era Deep South. It was inspired by the real-life story of U.S. Senator Huey P. Long, who was assassinated in 1935. Its title is drawn from the nursery rhyme "Humpty Dumpty."

Robert Penn Warren was an American poet, novelist, and literary critic and was one of the founders of New Criticism. He was also a charter member of the Fellowship of Southern Writers. He founded the literary journal The Southern Review with Cleanth Brooks in 1935. He received the 1947 Pulitzer Prize for the Novel for All the King's Men (1946) and the Pulitzer Prize for Poetry in 1958 and 1979. He is the only person to have won Pulitzer Prizes for both fiction and poetry.