The Brightonomicon is a novel by British fantasy author Robert Rankin. The title parodies that of the fictional grimoire Necronomicon from the Cthulhu Mythos. The author lives in Brighton, England, and the book is set in an accurate fictional depiction of the town. The book is based on "The Brighton Zodiac", a map consisting of carriageway constellations found in the city of Brighton and Hove, similar to the purported landscape zodiacs of Glastonbury and Kingston. The 2010 edition features a new cover design and internal illustrations by Rankin himself, who studied at the Ealing School of Art and worked briefly as an illustrator in the 1970s.