Fulgrim is a science fiction novel by Graham McNeill, part of the Horus Heresy series in the Warhammer 40K universe. Published in 2007 by Games Workshop, The Limited, it is the first edition of the book in mass-market paperback format. The book is written in English and intended for adult audiences. It features a narrative type of fiction and falls under the science fiction genre, specifically space opera and action & adventure.