Since its creation in the 1980s, ''Warhammer 40,000'' has had seven ten distinct versions or editions. With each edition, the Codex of each army has changed to reflect the new rules and units.

Usually one codex is valid until a revision is made, so all codexes from the 6th, 5th, 4th and 3rd Editions of ''Warhammer 40,000'' are still valid in the current, 7th 9th Edition, unless a later version has replaced it. There have been instances of codices that are not "standalone". They were known as "mini-dexes"or Codex Supplements. These were usually army lists that were variants of a mainstream army. An example would be the early 3rd Edition ''Codex: Catachans'', which required the main ''Codex: Imperial Guard'' to use. Mini-dexes are more or less extinct nowadays.

==Current List of Codices and Expansions==This is the list of codices which can be used to play today. ===Current Army Codices=======8th Edition Indexes==Sources==*[[Index: Imperium 1 (8th Edition){{Endn|Index: Imperium 1]]*[[Index: Imperium 2 (8th Edition)|Index}}: Imperium 2]]*[[Indexhttps: Chaos (8th Edition)|Index//www.games-workshop.com/en-GB/Psychic-Awakening-Phoenix-Rising-EN-2019 Games Workshop: ChaosPsychic Awakening Phoenix Rising]]*[[Index: Xenos 1 (8th EditionLast accessed 11/3/2019)|Index: Xenos 1]]*[[Index: Xenos 2 (8th Edition){{Endn|Index: Xenos 2]] ====8th Edition Codices====*[[Codex: Space Marines (8th Edition)|Codex}}: Space Marines]]*[[Codexhttps: Grey Knights (8th Edition)|Codex: Grey Knights]]*[[Codex//www.warhammer-community.com/2019/11/02/new-reveals-chaos-sororitas-tanks-and-moregw-homepage-post-1/ Warhammer Community: New Reveals, Chaos Space Marines , Sororitas tanks, and more (8th Editionposted November 3 2019)|Codex: Chaos Space Marines]]*[[Codex: Death Guard (8th EditionLast accessed 11/3/2019)|Codex: Death Guard]]*[[Codex: Adeptus Mechanicus (8th Edition){{Endn|Codex3}}: Adeptus Mechanicus]]*[[Codexhttps://www.warhammer-community.com/2020/03/28/the-first-ever-warhammer-preview-onlinegw-homepage-post-1fw-homepage-post-1/ Warhammer Community: Astra Militarum The First Ever Warhammer Preview Online (8th Editionposted 3/28/2020)|Codex: Astra Militarum]]*[[Codex: Craftworlds (8th Editionlast accessed 3/28/2020)|Codex: Craftworlds]]*[[Codex: Tyranids (8th Edition){{Endn|Codex4}}: Tyranids]]*[[Codexhttps://www.warhammer-community.com/2020/04/04/the-warhammer-preview-online-2-heroes-heretics-and-a-squirrelgw-homepage-post-1fw-homepage-post-1/ Warhammer Community: Blood Angels Heroes, Heretics and a Squirrel (8th Editionposted 4/4/2020)|Codex: Blood Angels]]*[[Codex: Dark Angels (8th Editionlast accessed 4/2/2020)|Codex: Dark Angels]]*[[Codex: Chaos Daemons (8th Edition){{Endn|Codex5}}: Chaos Daemons]]*[[Codexhttps://www.warhammer-community.com/2020/07/25/the-warhammer-40000-launch-party-preview/ Warhammer Community: Adeptus Custodes The Warhammer 40,000 Launch Party Preview (8th EditionPosted on 25/07/2020)|Codex: Adeptus Custodes]]*[[Codex: Thousand Sons (8th EditionLast accessed on 25 July 2020)|Codex: Thousand Sons]]*[[Codex: T'au Empire (8th Edition){{Endn|Codex6}}: T'au Empire]]*[[Codexhttps: Necrons (8th Edition)|Codex//www.warhammer-community.com/2020/09/12/the-codex-show/ Warhammer Community: Necrons]]*[[The Codex: Drukhari Show (8th Editionposted 9/12/2020)|Codex: Drukhari]]*[[Codex: Deathwatch (8th Editionlast accessed 9/12/2020)|Codex: Deathwatch]]*[[Codex: Harlequins (8th Edition){{Endn|Codex7}}: Harlequins]]*[[Codexhttps: Imperial Knights //www.warhammer-community.com/2020/11/21/warhammer-preview-online-decadence-decay/ Warhammer Community Warhammer Preview Online Decadence and Decay (8th Editionposted 11/21/2020)|Codex: Imperial Knights]]*[[Codex: Space Wolves (8th Editionlast accessed 11/21/2020)|Codex: Space Wolves]]*[[Codex: Gellerpox Infected{{Endn|Gellerpox Infected]]*[[Codex8}}: Elucidian Starstriders|Elucidian Starstriders]]*[[Codexhttps: Orks (8th Edition)|Orks]]*[[//www.warhammer-community.com/2021/08/13/whos-getting-a-new-codex-in-2021-find-out-with-our-road-map-for-warhammer-40000/ Who’s Getting a New Codex: Genestealer Cults (8th Edition)|Genestealer Cults]] ===8th Edition Campaigns & Expansions===*[[Imperium Nihilus: Vigilus Defiant]]*[[in 2021? Find Out With Our Road Map for Warhammer 40,000: Kill Team Core Manual (2nd Edition)]]*[[Speed Freedks (Gameposted 08/13/2021)]]*[[Warhammer Quest: Blackstone Fortress]]*[[Urban Conquest]] ==See Also==* [[Codices (Listlast accessed 08/13/2021)]] - For a list of all released Codices.