The '''Shield Chapters of Ultramar''' are 10ten{{Fn|1}} [[Ultramarine]]-descended [[Chapters]], that [[Lord Commander]] [[Roboute Guilliman|Guilliman]] has charged with permanently defending the [[Realm of Ultramar]]. In order to perform their duties, each Shield Chapter has command of a world within Ultramar to use as their base of operations.{{Fn|2}}

*[[UltramarinesAquiloan Brotherhood]] — [[Macragge]].{{Fn|23}}

*[[Doom Eagles]]{{Fn|3}}*[[Novamarines]]{{Fn|3}}*[[Praetors of Ultramar]] — [[Howsbridge]].{{Fn|2}} or [[Joros (Moon)|Joros]]{{Fn|4}}*[[Reborn (Chapter)|Reborn]]{{Fn|3}}

*[[NovamarinesUltramarines]]{{Fn|3}}*— [[Doom Eagles]]{{Fn|3}}*[[Aquiloan Brotherhood]]{{Fn|3}}*[[Silver Skulls]]{{Fn|3}}*[[Reborn (Chapter)|RebornMacragge]].{{Fn|32}}