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{{Army book|Image =Codex_Ultramarines_FCover.jpg|Name =Codex: Ultramarines|Author(s) =[[Rick Priestley]], [[Jervis Johnson]], [[Alan Merrett]]|Editor(s) =|Cover Artist =[[Dave Gallagher]]|Illustrator(s)=[[John Blanche]], [[Wayne England]], [[Mark Gibbons]], [[Des Hanley]]|Game =[[Warhammer 40,000]]|Released =1995|Pages =97|ISBN =ISBN 1-872372-87-2|Preceded by = |Followed by =[[Codex: Space Marines (3rd Edition)]]}}The '''Codex: Ultramarines''' was the first rule book dedicated entirely to [[Space Marine]]s, and, although its focus was on the [[Ultramarines]] [[chapter]] it was suitable for use with any ''codex'' Space Marine army. The format of the army in Codex: Ultramarines was later developed into the generic format found in the ensuing ''Codex: Space Marines'', as opposed to the army formats found in either of its contemporaries [[Codex: Angels of Death]] and [[Codex: Space Wolves (2nd Edition)|Codex: Space Wolves]].

[[Image:Codex_Ultramarines_FCover.jpg|thumb|right|150px|Cover of the ''Codex: Ultramarines'']]Codex: Ultramarines is an expansion book for the Games Workshop Table Top game Warhammer 40,000. This edition of the book was published for the first time in 1995, and is for the [[Warhammer 40,000 2nd Edition Rulebook|2nd edition]] of Warhammer 40,000. Although the Codex focused on the Ultramarines Chapter, it was suitable for use with any 'Codex' Space Marine Army.