'''Codex: Chaos Space Marines''' is an expansion book for the [[Games Workshop]] tabletop game [[Warhammer 40,000]]. This edition of the book was published for the first time October 3rd 6th 2012 for the [[Warhammer 40,000 6th Edition Rulebook|6th edition]] of Warhammer 40,000. It was the first release for the 6th edition of the game. The hardcover book has 104 pages and the cover is printed in color.