Lisa Gracia Tuttle (born September 16, 1952) is an American science fiction, fantasy, and horror author. She has published more than a dozen novels, seven short story collections, and several non-fiction titles, including a reference book on feminism, Encyclopedia of Feminism (1986). She has also edited several anthologies and reviewed books for various publications. She has been living in the United Kingdom since 1981.

Tuttle won the John W. Campbell Award for Best New Writer in 1974, received the 1982 Nebula Award for Best Short Story for "The Bone Flute", which she refused, and the 1989 BSFA Award for Short Fiction for "In Translation".

Lisa Tuttle began writing when she attended The Kinkaid School in Piney Point Village, Texas. At Lamar High School in Houston she was active in science fiction fandom, and founded and edited the Houston Science Fiction Society's fanzine, Mathom. At Syracuse University in New York, she wrote for the university's fanzine Tomorrow And…, plus several alternative newspapers. In 1971 Tuttle attended the Clarion Writer's Workshop, running that year at Tulane University in New Orleans, after which she sold her first short story, "Stranger in the House", which appeared in 1972 in Clarion II, an anthology edited by Robin Wilson. In 1974 Tuttle received a BA degree in English Literature and moved to Austin, Texas, where she worked as a journalist for five years at the Austin American-Statesman, a daily newspaper.

In 1973 Tuttle and several other science fiction writers, including Howard Waldrop, Steven Utley and Bruce Sterling, founded the Turkey City Writer's Workshop in Austin, Texas, and in 1974 she was joint winner of the John W. Campbell Award for Best New Writer with Spider Robinson. Tuttle collaborated with author and screenwriter George R. R. Martin on a novella, The Storms of Windhaven that was nominated for a Hugo Award in 1976. Tuttle and Martin later expanded the novella into a novel, Windhaven, which was published in 1981.

Over the next 25 years Tuttle wrote a number science fiction and fantasy novels, including Lost Futures (1992), which was nominated for the Arthur C. Clarke and James Tiptree, Jr. Awards. She has also written young adult fiction and published several titles, including Catwitch (with illustrator Una Woodruff) (1983), Panther in Argyll (1996) and Love-on-Line (1998).

She has written under different shared house pen names with other authors for series of books. In 1987 she wrote the Casualty novelization Megan's Story under the name Laura Waring, Virgo: Snake Inside for a series of twelve young-adult books called Horrorscopes (1995) under the house pseudonym of Maria Palmer (although it was later reissued under her own name), and was a contributing author to Ben M. Baglio's Dolphin Diaries (2000–2002), a young-adult series of books, writing the first 8 books in the series, which were published as by Ben M. Baglio in the US and as by Lucy Daniels in the UK.^{[citation needed]}

In addition to fiction, Tuttle has written non-fiction, including the Encyclopedia of Feminism (1986) and Writing Fantasy and Science Fiction (2002). As editor she has compiled several anthologies, including Skin of the Soul: New Horror Stories by Women (1990), and Crossing the Border: Tales of Erotic Ambiguity (1998), the latter covering the topic of genderbending.

Tuttle's fiction often focuses on gender issues and includes "strong-willed women" who question their identities. British author David V. Barrett wrote that her stories are "emotionally uncomfortable", and that "they not only make you think, they make you feel". Her science fiction works have been associated with feminist science fiction, and The Cambridge Guide to Women's Writing in English said that many of her stories use elements of science fiction and horror to "dramatize aspects of the human, and specifically the female, condition". It described The Pillow Friend as her "most satisfactory" novel, saying that it "trades more on ambiguities in its use of imaginary friends, phantom pregnancies and edible boyfriends".