A Space Marine Chapter Homeworld is an Imperial planetological classification for a world that serves as a base for a Space Marine Chapter's fortress-monastery. For some Chapters the world also serves as their sole recruiting world; other Chapters draw their recruits from several planets. A "Chapter planet" is an Astartes world which is both governed by the Chapter as a feudal possession of the Imperium of Man and which serves as the base for their fortress-monastery. Astartes homeworlds may be Imperial planets, while some are not planets at all, but take the form of orbiting spacecraft, space stations, deserted moons or asteroids. The Master of the Chapter is often also the traditional feudal ruler of the Chapter planet, in which case the Chapter Master also holds the rank of Planetary Governor and Imperial Commander. Many Astartes homeworlds are Death Worlds, Feral Worlds and Feudal Worlds, whose societies provide the best warriors. Not all Space Marine Chapters have a single homeworld; some Chapters such as the Imperial Fists, Black Templars and Blood Ravens take their Aspirants from several different worlds. Fleet-based Chapters do not possess homeworlds, and instead recruit from any convenient and promising worlds they pass near in the course of their duties. Several Space Marine Chapters guilty of crimes against the Emperor (but those still deemed redeemable by the Inquisition and the High Lords of Terra), such as the Mantis Warriors and Executioners, have been forced to forfeit their homeworlds - which requires them to become completely Fleet-based Chapters.

Selected List of Adeptus Astartes Homeworlds

Sources

• Codex: Space Marines (5th Edition)
• Codex: Tyranids (5th Edition), p. 28
• Warhammer 40,000 Rulebook (5th Edition)
• Imperial Armour Volume Four - The Anphelion Project, pp. 121-129
• Imperial Armour Volume Nine - The Badab War - Part One, p.7
• The Flight of the Eisenstein (Novel) by James Swallow
• A Thousand Sons (Novel) by Graham McNeill
• Prospero Burns (Novel) by Dan Abnett
• Rynn's World (Novel) by Steve Parker