Lunar Park is a novel by Bret Easton Ellis with elements of faux autobiography and pastiche. It was released by Knopf on August 16, 2005. It is notable for being the first book written by Ellis to use past tense narrative.

The novel begins with an inflated and parodic but reasonably accurate portrayal of Ellis' early fame. It details incidents of his wild drug use and his publicly humiliating book tours to promote Glamorama. The novel dissolves into fiction as Ellis describes a liaison with an actress named Jayne Dennis, whom he later marries, and with whom he conceives an (initially) illegitimate child. From this point the fictional Ellis' life reflects the real Ellis' only in some descriptions of the past and possibly in his general sentiments.

Ellis and Jayne move to fictional Midland, an affluent suburban town outside New York City, which they no longer consider safe due to pervasive terrorist acts in a post-9/11 America. Fictional incidents include suicide bombings in Wal-Marts and a dirty bomb detonated in Florida. Strange incidents start happening on a Halloween night, some involving Sarah's (Ellis' fictional stepdaughter) Terby doll.

Bret Easton Ellis (born March 7, 1964 in Los Angeles, California) is an American novelist and short story writer. His works have been translated into 27 languages. He was regarded as one of the so-called literary Brat Pack, which also included Tama Janowitz and Jay McInerney. He is a self-proclaimed satirist, whose trademark technique, as a writer, is the expression of extreme acts and opinions in an affectless style. Ellis employs a technique of linking novels with common, recurring characters.

Though Ellis made his debut at 21 with the controversial 1985 bestseller Less Than Zero, a zeitgeist novel about amoral young people in Los Angeles; the work he is most known for is his third novel, 1991's American Psycho. On its release, the literary establishment widely condemned the novel as overly violent and misogynistic; though many petitions to ban the book saw Ellis dropped by Simon & Schuster, the resounding controversy made it a paperback bestseller for Alfred A. Knopf later that year. Four of Ellis' works have been made into films; notably, Less Than Zero was rapidly adapted for screen, and a starkly different Less Than Zero film was released in 1987, and Mary Harron's adaptation of American Psycho was released to predominantly positive reviews in 2000. In later years, Ellis' novels have become increasingly metafictional. 2005's Lunar Park, a pseudo-memoir and ghost story, received positive reviews, and 2010's Imperial Bedrooms, marketed as a sequel to Less Than Zero, continues in this vein.