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[[fileFile:SMChapter.jpg|thumb|500px|Space Marines of the [[Ultramarines]] chapter assembled for battle{{Fn|11a}}]]

[[File:SMChapterOrgNew.jpg|thumb|right|350px|Organisation of a Space Marine Chapter since the introduction of [[Primaris Space Marines]]{{Fn|77a}}]]

A so-called [[Codex Chapter]], meaning a Chapter which closely follows the doctrines of the [[Codex Astartes]], is made up of ten [[Space Marine Company|companies]], each consisting of one hundred Marines and commanded by an officer with the rank of [[Space Marine Captain|Captain]]. Below the Captain are two [[Lieutenant (Space Marine)|Lieutenant]]s which each command a Demi-Company.{{Fn|5}} Generally, the [[First Company]] is made up of the Chapter's most experienced [[Space Marine Veteran|Veteran]]s, while the Second through Ninth consist of more ordinary warriors. Some individual companies are specialised assault or support companies, possessing larger proportions of [[Assault Squad|Assault]], [[Devastator Squad|Devastator]], [[Hellblaster]], [[Eradicator Squad|Eradicator]]{{Fn|8}}, [[Aggressor]], [[Reiver]], and [[Inceptor]] squads. The tenth company is a [[Space Marine Scout|Scout]] force, made up of [[neophyte]] Space Marines not yet proven in battle. Typically, a standing force of 100 [[Vanguard Space Marine]]s are attached to the 10th Company.{{Fn|6}} The Chapter is further bolstered and supported by a [[Librarium]], [[Armoury]], [[Apothecarion]], [[Chaplaincy]], and [[Space Marine Fleet|Fleet]].{{Fn|77a}}

Besides the Space Marine fighting brethren, there are many non-combat personnel, fully part of the chapter but generally not involved directly in combat. These include the chapter's [[Chapter Serf|serf]]s, [[astropath]]s, [[navigator]]s, etc.{{Fn|77a}}

[[Image:SMOrg9th.jpg|thumb|right|250px|Modern Chapter organization{{Fn|3217a}}]]

** 10 Squads divided into either [[Veteran Squad|Veteran]], [[Battleline Squad|Battleline]], [[Close Support Squad|Close Support]], [[Fire Support Squad|Fire Support]], or [[Scout]] types with 5-10 [[Space Marines]] each{{Fn|1b}}{{Fn|77a}}{{Fn|3217a}}** various [[Dreadnought]]s, [[Rhino]]s, [[Impulsor]]s,{{Fn|337b}} [[Land Speeder]]s, [[Storm Speeder]]s,{{Fn|3217a}} and [[Bike]]s {{Fn|12a}}

* [[Dreadnought]]s: Dreadnoughts are very rare. Only very few Chapters have the capacity to build new ones from scratch, and even those that do can do so only a few at a time, because the construction of its core-piece, the Sarcophagus, is very complicated. Fortunately, the design of the Dreadnought is extremely durable and unless destroyed completely, it can eventually be repaired back into function.{{Fn|13a}}* [[Rhino]]s: Rhinos are the mainstay of every single Chapter's vehicle-pool as an armoured troop-carrier. Each is capable of transporting 10 Space Marines.{{Fn|1e}} Due to its nature as an [[STC]]-design, Rhinos are fairly easy to build and repair.{{Fn|13b}}*[[Impulsor]]s: Newer [[Era Indomitus]]-era [[Grav-Vehicle]] transports.{{Fn|337b}}* [[Bike]]s: The degree to which Bikes are deployed varies greatly from Chapter to Chapter, with for example the [[White Scars]] using them in great numbers, while other Chapters shun them in favour of [[Rhino]]s or [[Razorback]]s.{{Fn|1f}}* [[Land Speeder]]s: A typical Chapter fields about 50 to 70 Land Speeders. Though, some Chapters, like the [[Dark Angels]], the [[White Scars]] and the Successor-Chapters of the White Scars, field several times that number. As a counter-example, the [[Imperial Castilians]] field none.{{Fn|13c}}*[[Storm Speeder]]s: Heavier attack speeder.{{Fn|17a17b}}

* [[Predator]]s: A Chapter typically fields 20 to 30 Predators, though there are Chapters like the [[Iron Hands]] and [[Fire Angels]] which field more than 100. Due to the Predator being based on the Rhino-chassis, and that in itself being very adaptable, it is possible to retrofit Rhinos into Predators.{{Fn|13b}}*[[Gladiator(Battle Tank)|Gladiators]]s: Newer [[Era Indomitus]]-era [[Grav-Vehicle]] battle tanks.{{Fn|17b17c}}* [[Whirlwind]]s: A Chapter typically fields 20 to 30 Whirlwinds, although this varies greatly from Chapter to Chapter.{{Fn|12b}}* [[Vindicator]]s: A Chapter typically fields about 12 Vindicators.{{Fn|12c}} They are mostly used for sieges and in urban warfare, however some Chapters greatly value them for their sheer firepower and field them in great numbers as a frontline battle-tank.{{Fn|13b}}

* [[Land Raider]]s: Due to its nature as an [[STC]]-design, every Space Marine Chapter is capable of producing the components for building Land Raiders.{{Fn|12d}} As an example for their numbers, the [[Red Scorpions]] had 12 Land Raiders by the time of the [[Siege of Helios]].{{Fn|12e}}* [[Repulsor]]s: Newer [[Era Indomitus]]-era [[Grav-Vehicle]] heavy assault vehicles.{{Fn|11b}}

*Aircraft and Gunships such as the [[Thunderhawk]],{{Fn|1g}} [[Overlord Gunship|Overlord]],{{Fn|36}} [[Storm Eagle]],{{Fn|35}} [[Stormraven]],{{Fn|34d}} [[Stormhawk]],{{Fn|34d}} [[Xiphon]]{{Fn|3732}}, [[Stormtalon]],{{Fn|34d}} and [[Caestus Assault Ram|Caestus]].{{Fn|3833}}

*{{Endn|7}}: [[Codex: Space Marines (8th Edition, 2nd Codex)]], :**{{Endn|7a}}: pgs. 16-17**{{Endn|7b}}: pgs. 87-88

**{{Endn|17a}}: pg. 16**{{Endn|17b}}: pg. 39**{{Endn|17b17c}}: pgs. 181-182

* {{Endn|31}}: [[Codex Supplement: Ultramarines (8th Edition)]], pg. 7*{{Endn|32}}: [[CodexAeronautica Imperialis: Space Marines (9th Edition)Wrath of Angels]]Rulebook, pg. 1629*{{Endn|33}}: [[Codex: Space Marines (8th Imperial Armour - Apocalypse Second Edition, 2nd Codex)]], pgspg. 87-8831*{{Endn|34}}: [[Codex: Space Marines (10th Edition)]]:

*{{Endn|35}}: [[ Flesh of Cretacia (Novella)]], Chapter 3