The following pages list the tropes for the many characters, factions, organisations and races present in the Warhammer 40,000 universe. Tropes for characters solely, or originating from, novel series, Gaiden Games, Computer Games, etc. with their own pages, and without much of a presence in the Tabletop Game background material, should be placed on those pages rather than here.
Forces of the Imperium
- The Imperium of Man: The theocratic fascist galactic dominion which currently controls almost all human-held planets.
- Founders: The Emperor, his right-hand man, and the Primarchs of the Space Marines, who founded and helped shape the Imperium into its current state.
- Adeptus Astartes: The Space Marines, biologically- and cybernetically-enhanced super soldiers who serve as the Imperium's most powerful warriors.
- Adeptus Astartes Chapters: The most prominent of the individual armies of the Space Marines.
- Adeptus Astartes Heroes: The named characters for each of the aforementioned chapters.
- Primaris Marines: A new breed of enhanced Space Marines deployed to bolster the older Astartes in a time of extreme crisis.
- Astra Militarum: The Imperium's standing army, also known as the Imperial Guard: uncounted billions of simple human soldiers fighting in most of the Imperium's wars.
- Adepta Sororitas: An army of female nun-warriors serving as the chamber militant of the Ecclesiarchy, with the most notable being the Sisters of Battle.
- The Inquisition: The shadowy secret police organization which polices the Imperium for signs of corruption beyond the frontlines of battle.
- Adeptus Mechanicus: A cult of cyborg technicians who maintain the Imperium's technology and worship the Machine-god Omnissiah.
- Other Imperial Factions: Various organizations and armies serving the Imperium beyond the aforementioned.
Forces of Chaos
- The Forces of Chaos: The corruptive force that has permanently tainted the Warp.
- Xeno Races: The aliens that exist in the galaxy and are seen as a threat by the Imperium.
- Aeldari: Elf-like aliens with great psychic power and technology but remnants of a fallen empire; also known as Eldar.
- Necrons: An ancient race whose every soul was transferred into living metal automatons, awakening now to reconquer their lost domains.
- Orks: Barbarian green-skinned xenos genetically programmed to make war, who can be found everywhere and fight anyone for sport.
- The T'au: Blue-skinned xenos, an upstart and ambitious race who ambition to unite all in the galaxy for "the Greater Good".
- Tyranids: Extra-galactic invaders, united by a Hive Mind driving them to eat all organic matter in their path.