William Carlos Williams (September 17, 1883 – March 4, 1963) was an American poet closely associated with modernism and Imagism. He was also a pediatrician and general practitioner of medicine with a medical degree from the University of Pennsylvania School of Medicine. Williams "worked harder at being a writer than he did at being a physician" but excelled at both.

Although his primary occupation was as a family doctor, Williams had a successful literary career as a poet. In addition to poetry (his main literary focus), he occasionally wrote short stories, plays, novels, essays, and translations. He practiced medicine by day and wrote at night. Early in his career, he briefly became involved in the Imagist movement through his friendships with Ezra Pound and H.D. (also known as Hilda Doolittle, another well-known poet whom he befriended while attending the University of Pennsylvania), but soon he began to develop opinions that differed from those of his poet/friends.