Since its creation in the 1980s, ''Warhammer 40,000'' has had eight 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, 8th 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 {{Endn|1 (8th Edition)|Index}}: Imperium 1]]*[[Indexhttps: Imperium 2 (8th Edition)|Index//www.games-workshop.com/en-GB/Psychic-Awakening-Phoenix-Rising-EN-2019 Games Workshop: Imperium 2]Psychic Awakening Phoenix Rising]*[[Index: Chaos (8th EditionLast accessed 11/3/2019)|Index: Chaos]]*[[Index: Xenos 1 (8th Edition){{Endn|Index: Xenos 1]]*[[Index: Xenos 2 (8th Edition)|Index}}: Xenos 2]] ====8th Edition Codices====*[[Codexhttps: Space Marines (8th Edition)|Codex: Space Marines]]*[[Codex//www.warhammer-community.com/2019/11/02/new-reveals-chaos-sororitas-tanks-and-moregw-homepage-post-1/ Warhammer Community: Space Marines (8th EditionNew Reveals, 2nd Codex)|Codex: Space Marines (2nd Codex)]]*[[Codex: Grey Knights (8th Edition)|Codex: Grey Knights]]*[[Codex: 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: Astra Militarum (8th Edition)|Codex//www.warhammer-community.com/2020/03/28/the-first-ever-warhammer-preview-onlinegw-homepage-post-1fw-homepage-post-1/ Warhammer Community: Astra Militarum]]*[[Codex: Craftworlds The First Ever Warhammer Preview Online (8th Editionposted 3/28/2020)|Codex: Craftworlds]]*[[Codex: Tyranids (8th Editionlast accessed 3/28/2020)|Codex: Tyranids]]*[[Codex: Blood Angels (8th Edition){{Endn|Codex4}}: Blood Angels]]*[[Codexhttps: Dark Angels (8th Edition)|Codex//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: Dark Angels]]*[[Codex: Chaos Daemons Heroes, Heretics and a Squirrel (8th Editionposted 4/4/2020)|Codex: Chaos Daemons]]*[[Codex: Adeptus Custodes (8th Editionlast accessed 4/2/2020)|Codex: Adeptus Custodes]]*[[Codex: Thousand Sons (8th Edition){{Endn|Codex5}}: Thousand Sons]]*[[Codexhttps: T'au Empire (8th Edition)|Codex//www.warhammer-community.com/2020/07/25/the-warhammer-40000-launch-party-preview/ Warhammer Community: T'au Empire]]*[[Codex: Necrons The Warhammer 40,000 Launch Party Preview (8th EditionPosted on 25/07/2020)|Codex: Necrons]]*[[Codex: Drukhari (8th EditionLast accessed on 25 July 2020)|Codex: Drukhari]]*[[Codex: Deathwatch (8th Edition){{Endn|Codex6}}: Deathwatch]]*[[Codexhttps: Harlequins (8th Edition)|Codex//www.warhammer-community.com/2020/09/12/the-codex-show/ Warhammer Community: Harlequins]]*[[The Codex: Imperial Knights Show (8th Editionposted 9/12/2020)|Codex: Imperial Knights]]*[[Codex: Space Wolves (8th Editionlast accessed 9/12/2020)|Codex: Space Wolves]]*[[Codex: Gellerpox Infected{{Endn|Codex7}}: Gellerpox Infected]]*[[Codexhttps: Elucidian Starstriders|Codex: Elucidian Starstriders]]*[[Codex: Orks //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: Orks]]*[[Codex: Genestealer Cults (8th Editionlast accessed 11/21/2020)|Codex: Genestealer Cults]]*[[Codex: Vanguard Space Marines (8th Edition){{Endn|Codex8}}: Vanguard Space Marines]]*[[Codexhttps: Daemonkin (8th Edition)|Codex: Daemonkin]]*[[Codex: Chaos Knights (8th Edition)|Codex: Chaos Knights]] ===8th Edition Codex Supplements===*[[Codex Supplement: Ultramarines (8th Edition)]]*[[Codex Supplement: White Scars (8th Edition)]]*[[//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 Supplement: Raven Guard (8th Edition)]]*[[Codex Supplement: White Scars (8th Edition)]] ===8th Edition Campaigns & Expansions===*[[Imperium Nihilus: Vigilus Defiant]]*[[Imperium Nihilus: Vigilus Ablaze]]*[[Shadowspear (Campaign Book)]]*[[in 2021? Find Out With Our Road Map for Warhammer 40,000: Kill Team Core Manual (2nd Edition)]]*[[Speed Freeks (Game)]]*[[Warhammer Quest: Blackstone Fortress]]*[[Urban Conquest]]*[[Apocalypse (2019posted 08/13/2021)]] ==Related Articles==* [[Codices (Listlast accessed 08/13/2021)]] — For a list of all released Codices.