'''Codex: Chaos Space Marines''' is an expansion book for the [[Games Workshop]] tabletop game [[Warhammer 40,000]] for the [[Chaos Space Marine]] army. This edition of the book was published on October 6th, 2012 for the [[6th Edition]] of Warhammer 40,000. It was the first codex released for the 6th edition of the game. The hardcover book has 104 pages and the cover is printed in color. It was the first Army Codex to be released in hardcover format by Games Workshop.