Thomas Williams (1926-October 23, 1990) was an American writer.

His family moved to New Hampshire when he was a child, and Williams spent most of his life in the state. He worked as a writer and teacher at the University of New Hampshire, and is the author of seven novels. These include Whipple's Castle (1969), Tsuga's Children (1977), The Followed Man (1978), Moon Pinnace (1986), and The Hair of Harold Roux, which won a National Book Award in 1975. He is also the author of several short stories.

One of the students he tutored during his time at New Hampshire was the novelist John Irving, who wrote an introduction to a posthumous collection of Williams's collected stories, Leah, New Hampshire (1992).

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