The Language of the Night: Essays on Fantasy and Science Fiction is a collection of essays written by Ursula K. Le Guin and edited by Susan Wood. It was first published in 1979 and published in a revised edition in 1992. The essays discuss various aspects of the science fiction and fantasy genres, as well as Le Guin's own writing process. The 24 essay selections come from a variety of sources, including journals, book introductions, and award-acceptance speeches. The title comes from Le Guin's description of fantasy literature: "We like to think we live in daylight, but half the world is always dark; and fantasy, like poetry, speaks the language of the night."