- 'Ardboy
- 101st Betic Dragons
- 10th Black Crusade
- 10th Founding
- 110th Cadian
- 11th Black Crusade
- 122nd Cadian
- 133rd Lambdan Lions
- 13th/5th Imperial Army
- 13th Black Crusade
- 13th Black Crusade (Original)
- 13th Founding
- 13th Penal Legion (Last Chancers)
- 14th Alphic Dragons
- 196th Iotan Gryphonnes
- 196th Omicroid Hydras
- 19th Founding
- 1st Black Crusade
- 1st Claw (Night Lords)
- 21st Founding
- 22nd Thetoid Gryphonnes
- 23rd Founding
- 25th Founding
- 26th Founding
- 29th Zetic Tygers
- 2nd Black Crusade
- 32nd Thetoid Eagles
- 33rd Deltic Phoenixes
- 33rd Zetan Falcons
- 34th Betic Centaurs
- 34th Psian Vipers
- 394th Deltic Lions
- 39th Cadian
- 3rd Alphic Jackals
- 3rd Black Crusade
- 3rd Founding
- 412th Cadian
- 417th Cadian
- 43rd Iotan Dragons
- 47th Thetoid Dragons
- 4th Black Crusade
- 4th Founding
- 50th Kappic Eagles
- 54th Psian Jakals
- 55th Alphic Hydras
- 55th Kappic Eagles
- 5th Betan Tygers
- 5th Black Crusade
- 62nd Rhoin Cobras
- 63rd Expeditionary Fleet
- 68th Deltic Lions
- 6th Black Crusade
- 73rd Epsilic Eagles
- 7th Black Crusade
- 7th Cadian
- 7th Epsiloid Hawks
- 835th Psian Pegasi
- 85th Vendoland
- 86th Deltic Dragons
- 88th Alphic Lions
- 88th Kappic Phoenixes
- 88th Siege Army
- 8th Black Crusade
- 8th Cadian
- 8th Founding
- 9836-18 Grave Core
- 99th Deltic Gorgonnes
- 9th Black Crusade
- 9th Founding
- 9th Iotan Gorgonnes
- A.N-vyl
- A Deeper Darkness (Anthology Short Story)
- A Ghost Return (Short Story)
- A Good Man (Anthology Short Story)
- A Lesson In Darkness (Audio Drama)
- A Safe and Shadowed Place (Short Story)
- A Thousand Sons
- Aaron Dembski-Bowden
- Abaddon
- Abdemon
- Abdul Goldberg
- Abelard Werserian
- Aberrant
- Aberrus System
- Abeyant
- Abheilüng
- Abhorrent-class Knight
- Abhuman
- Abominant
- Abominatus
- Abrasax
- Abrial's Claw
- Absolla Root
- Absolvers
- Abyss-class Battleship
- Abyssal Crusade
- Abyssal Staff
- Acastus Knight Asterius
- Acastus Knight Porphyrion
- Accatran
- Accelerator Autocannon
- Accelerator Cannon
- Accipiters
- Accursed Crozius
- Acheron-Pattern Flame Cannon
- Acheron-class Heavy Cruiser
- Achilles-Alpha Pattern Land Raider
- Achilles Ridgerunner
- Achilus Crusade
- Acolyte Hybrid
- Acolyte Iconward
- Acreage
- Acuitor Mech-Assassin
- Adamant Fury
- Adamantine Lions
- Adamantium
- Adamus Temple
- Adepta Sororitas
- Adepts
- Adeptus Administratum
- Adeptus Arbites
- Adeptus Astartes Aviation
- Adeptus Astra Telepathica
- Adeptus Astronomica
- Adeptus Custodes
- Adeptus Fidicius
- Adeptus Mechanicus
- Adeptus Mechanicus Cruiser
- Adeptus Ministorum
- Adeptus Terra
- Adeptus Vaelarii
- Adharon's Reavers
- Admonition
- Adnector Concillium
- Adrastapol
- Adrastia
- Adrastus Bolt Caliver
- Adrathic Weapons
- Adrax Agatone
- Adrenal Glands
- Adrian Tchaikovsky
- Adrielle Quist
- Adrion
- Adulators
- Adummin
- Advanced Stabilisation System
- Advanced Targeting System
- Aegis Defence Line
- Aegult Caidin
- Aeldari
- Aeldari Empire
- Aeldari Lexicon
- Aeldari Mythology
- Aeldari Pantheon
- Aeldari Titans
- Aeonstave
- Aerion Mersaror
- Aerius
- Aeronautica Imperialis
- Aetaos'rau'keres
- Aexe Cardinal
- After Desh'ea (Anthology Short Story)
- Ag'Ni
- Agaith
- Agamatus Jetbike Squad
- Agathean Domain
- Agathon (Deathwatch)
- Age of Apostasy
- Age of Darkness (Anthology)
- Age of Redemption
- Age of Strife
- Age of Technology
- Age of Terra
- Age of the Imperium
- Aggressor
- Aghoru Campaign
- Agoniser
- Agri-World
- Agripinaa
- Agripinaa Sector
- Agripinaa System
- Ahazra Redth
- Ahhotekh
- Ahmontekh
- Ahriman
- Ailill Nuada
- Aiolos Missile Launcher
- Air Caste
- Airbursting Fragmentation Projector
- Airtorch Canister
- Akrep Xie
- Aktôl Vatyk
- Al'rahem
- Alaitoc
- Alanthrasil Swiftblade
- Alaric Prime
- Alastor Rushal
- Alathresis
- Alaxis McKale
- Alaxxes Nebula
- Alber vander Trake
- Alchemical Weapons
- Aldrik Voldus
- Alessio Cortez
- Alex Hammond
- Alexis Polux
- Alicia Dominica
- Alkedre Firestalker
- All That Remains (Short Story)
- Allarus Pattern Terminator Armour
- Allegiance (Short Story)
- Allewis LXXXIII
- Alpha Legion
- Alpha Primus (Primaris Marine)
- Alpharius - Head of the Hydra (Novella)
- Alpharius Omegon
- Alphos
- Alric
- Altansar
- Amalathian
- Amar Astarte
- Amaranthine Syndicate
- Amaranthite
- Amasec
- Amberley Vail
- Ambition-class Cruiser
- Ambot
- Ambulator Frame
- Ambull
- Amendera Kendel
- Amenophis IV
- Amnaich
- Amon
- Amon Harakht
- Amon Tauromachian
- Amontep II
- An'ggrath the Unbound
- An'kha'arak
- Anakatis Kul Blade-Slave
- Anakwanar Sek
- Anarkh'ad'nron
- Anastasia Arkelius
- Anathame
- Anathrax
- Anbaric Claw
- Ancestor's Vengeance Warhead
- Ancestors
- Ancestral Ward Crest
- Ancestral Warding Stave
- Ancient
- Ancient History
- Andar Scarion
- Andras Millward
- Andreas Carnhide
- Andy Chambers
- Andy Clark
- Andy Hoare
- Andy Smillie
- Angel's Tears
- Angel's Tears Grenade Launcher
- Angel Exterminatus
- Angel Exterminatus (Novel)
- Angel Guard
- Angelis
- Angels Apocrypha
- Angels Encarmine
- Angels Eradicant
- Angels Erythrean
- Angels Excelsis
- Angels Glorious
- Angels Numinous
- Angels Penitent
- Angels Porphyr
- Angels Puissant
- Angels Redeemed
- Angels Repentant
- Angels Resplendent
- Angels Revenant
- Angels Sanguine
- Angels Vermillion
- Angels Vindicant
- Angels of Absolution
- Angels of Caliban
- Angels of Damnation
- Angels of Defiance
- Angels of Ecstasy
- Angels of Fire
- Angels of Flame
- Angels of Fury
- Angels of Iron
- Angels of Light
- Angels of Pain
- Angels of Penance
- Angels of Purgatory
- Angels of Redemption
- Angels of Repentance
- Angels of Retribution
- Angels of Vengeance
- Angels of Vigilance
- Angels of Wrath
- Angels of the Grail
- Angelus Sub-sector
- Angevin Crusade
- Angron
- Angron's Chosen
- Angron's Fury
- Angron (Anthology)
- Angron - Slaves of Nuceria (Novella)
- Animus Speculum
- Ankh-Heloth
- Annihilation Barge
- Annihilator Beam
- Annihilators
- Anointed
- Anrakyr
- Antaro Chronus
- Antax
- Anthony Reynolds
- Anthrazods
- Antiquarti
- Anton Narvaez
- Anton Zerbe
- Antor Delassio
- Anuaris
- Anval Thawn
- Anvillus Pattern Dreadclaw
- Anvilus Autocannon Battery
- Apharan
- Aphotic Blade
- Apocalypse-class Battleship
- Apocalypse-class Titan
- Apocalypse Company
- Apocalypse Missile Launcher
- Apocrypha of Davio
- Apocrypha of Skaros
- Apollo Diomedes
- Apostate-class Heavy Raider
- Apostate Cardinal
- Apostle's Creed (Anthology Short Story)
- Apostles of Contagion
- Apostles of MinthRas
- Apothecary
- Aptus Non
- Aquila
- Aquila Lander