The Left Hand of Darkness is a science fiction novel by the American writer Ursula K. Le Guin. Published in 1969, it became immensely popular, and established Le Guin's status as a major author of science fiction. The novel is set in the fictional Hainish universe as part of the Hainish Cycle, a series of novels and short stories by Le Guin, which she introduced in the 1964 short story "The Dowry of Angyar". It was fourth in sequence of writing among the Hainish novels, preceded by City of Illusions, and followed by The Word for World Is Forest.

Ursula Kroeber Le Guin was an American author best known for her works of speculative fiction, including science fiction works set in her Hainish universe, and the Earthsea fantasy series. Her work was first published in 1959, and her literary career spanned nearly sixty years, producing more than twenty novels and over a hundred short stories, in addition to poetry, literary criticism, translations, and children's books. Frequently described as an author of science fiction, Le Guin has also been called a "major voice in American Letters". Le Guin said she would prefer to be known as an "American novelist".