Thomas Michael Disch (February 2, 1940 – July 4, 2008) was an American science fiction writer and poet. He won the Hugo Award for Best Related Book—previously called "Best Non-Fiction Book"—in 1999. He had two other Hugo nominations and nine Nebula Award nominations to his credit, plus one win of the John W. Campbell Memorial Award, a Rhysling Award, and two Seiun Awards, among others.
In the 1960s, his work began appearing in science-fiction magazines. His critically acclaimed science fiction novels, The Genocides, Camp Concentration and 334 are major contributions to the New Wave science fiction movement. In 1996, his book The Castle of Indolence: On Poetry, Poets, and Poetasters was nominated for the National Book Critics Circle Award, and in 1999, Disch won the Nonfiction Hugo for The Dreams Our Stuff Is Made Of, a meditation on the impact of science fiction on culture, as well as the Michael Braude Award for Light Verse. Among his other nonfiction work, he wrote theatre and opera criticism for The New York Times, The Nation, and other periodicals. He published several volumes of poetry as Tom Disch.