Alan Moore is an English author known primarily for his work in comic books, including Watchmen, V for Vendetta, The Ballad of Halo Jones, Swamp Thing, Batman: The Killing Joke, Superman: Whatever Happened to the Man of Tomorrow?, and From Hell. He is widely recognized among his peers and critics as one of the best comic book writers in the English language.

Moore started writing for British underground and alternative fanzines in the late 1970s before achieving success publishing comic strips in magazines such as 2000 AD and Warrior. He was subsequently picked up by DC Comics as "the first comics writer living in Britain to do prominent work in America," where he worked on major characters such as Batman and Superman, substantially developed the character Swamp Thing, and penned original titles such as Watchmen.

In the late 1980s and early 1990s, he left the mainstream comic industry and went independent for a while, working on experimental projects such as the epic From Hell and the prose novel Voice of the Fire. He returned to the mainstream in the late 1990s, working for Image Comics before developing America's Best Comics, an imprint through which he published works such as The League of Extraordinary Gentlemen and the occult-based Promethea.

In 2016, he published Jerusalem, a 1,266-page experimental novel set in his hometown of Northampton, UK. Moore is an occultist, ceremonial magician, and anarchist, and these themes feature prominently in his works. Despite his objections, Moore's works have been adapted into several Hollywood films, including From Hell (2001), The League of Extraordinary Gentlemen (2003), V for Vendetta (2005), and Watchmen (2009).

He has lived a significant portion of his life in Northampton, England, and his stories often draw heavily from his experiences there. Moore has been referenced in popular culture and recognized as an influence on a variety of literary and television figures, including Neil Gaiman and Damon Lindelof.