Elizabeth Curtis Sittenfeld (born August 23, 1975) is an American writer. She is the author of two collections of short stories, You Think It, I'll Say It (2018) and Show don't tell (2025), as well as seven novels: Prep (2005), the story of students at a Massachusetts prep school; The Man of My Dreams (2006), a coming-of-age novel and an examination of romantic love; American Wife (2008), a fictional story loosely based on the life of First Lady Laura Bush; Sisterland (2013), which tells the story of identical twins with psychic powers; Eligible (2016), a modern-day retelling of Pride and Prejudice; Rodham (2020), an alternate history political novel about the life of Hillary Clinton; and Romantic Comedy (2023), a romance between a comedy writer and a pop star.

Her works have been translated into thirty languages, and her short stories have appeared in The New Yorker, The Washington Post Magazine, Esquire, and The Best American Short Stories, for which she has also served as a guest editor. Her nonfiction has appeared in The New York Times, The Atlantic, Time, and Vanity Fair, and on public radio's This American Life.