Feminist science fiction is a subgenre of science fiction focused on such feminist themes as: gender inequality, sexuality, race, economics, reproduction, and environment. Feminist SF is political because of its tendency to critique the dominant culture. Some of the most notable feminist science fiction works have illustrated these themes using utopias to explore a society in which gender differences or gender power imbalances do not exist, or dystopias to explore worlds in which gender inequalities are intensified, thus asserting a need for feminist work to continue.Science fiction and fantasy serve as important vehicles for feminist thought, particularly as bridges between theory and practice. No other genres so actively invite representations of the ultimate goals of feminism: worlds free of sexism, worlds in which women's contributions are recognized and valued, worlds that explore the diversity of women's desire and sexuality, and worlds that move beyond gender.

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.