Sarah Elizabeth Monette (born November 25, 1974) is an American novelist and short story writer, primarily known for her work in the fantasy and horror genres. Under the pseudonym Katherine Addison, she published the fantasy novel The Goblin Emperor, which received the Locus Award for Best Fantasy Novel and was nominated for the Nebula, Hugo, and World Fantasy Awards.

Born and raised in Oak Ridge, Tennessee—one of the secret cities of the Manhattan Project—she pursued her education in English and Classics, obtaining both her M.A. and Ph.D. in English Literature. Her first four novels were published by Ace Books.

She has collaborated with Elizabeth Bear, writing A Companion to Wolves and The Tempering of Men for Tor. Her short stories have been featured in various publications like Lady Churchill's Rosebud Wristlet, Weird Tales, and Strange Horizons. She has also published two collections of short stories, Somewhere Beneath Those Waves and The Bone Key.