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Lost Chapters are Space Marine Chapters that have ceased to exist. Some were annihilated in one sudden strike, while others were slowly destroyed through attrition, being unable for whatever reason to recruit new marines fast enough to replace combat losses. Information about these chapters is often lost during the millennia and all-too scarce.

They should not to be confused with the Renegade Chapters, who are deemed Excommunicate Traitoris by the Imperium. Renegade chapters still exist but have gone rogue, breaking their vows of loyalty towards the Imperium. Some of them are simple traitors, fallen to Chaos. Others are idealistic rebels who rejected the all-too oppressive Imperial authority for some reason.

Alphabetical order	name	notes	source
B	Brazen Skulls	circumstances unknown	Sabbat Martyr (Novel), p. 46
E	Emperor's Swords (Bellicas)	was annihilated by Necrons	Codex: Space Marines (5th Edition) p.49
	Emperor's Swords (Ghorstangrad)	was annihilated by the Alpha Legion	Codex: Chaos Space Marines (4th Edition) p.21
F	Fire Hawks	officially declared destroyed, survivors form the Legion of the Damned
S	Silver Stars	hinted that the cause was a failure to collect sufficient gene-seed	Conquest of Armageddon (Novel), p. 44
	Sons of Gorgax	hinted that the cause was a failure to collect sufficient gene-seed	Conquest of Armageddon (Novel), p. 44
	Star Scorpions	the fleet carrying the chapter was lost in the warp, officially declared destroyed
W	Warhawks	victims of Doombreed
	Wolf Brothers	disbanded due to genetic instability
V	Venerators	victims of Doombreed