This page contains links to a complete chronology of the history of the Warhammer 40,000 universe:
- M0 - Ancient History
- M1 - Age of Terra (also called the Age of Progress) begins
- M2
- M3
- M4
- M5
- M6
- M7
- M8
- M9
- M10
- M11
- M12
- M13
- M14
- M15 - Dark Age of Technology begins
- M16
- M17
- M18
- M19
- M20
- M21
- M22
- M23
- M24
- M25 - Age of Strife begins
- M26
- M27
- M28
- M29
- M30 - Fall of the Aeldari, First Founding, Great Crusade begins
- M31 - Horus Heresy, Great Scouring, Age of the Imperium begins, Age of Rebirth begins
- M32 - War of the Beast, The Forging begins
- M33
- M34
- M35 - Nova Terra Interregnum begins
- M36 - The Age of Apostasy, Reign of Blood and the Plague of Unbelief
- M37 - Age of Redemption begins
- M38 - The Waning begins
- M39
- M40
- M41 - Gothic War, the Damocles Gulf Crusade, the Sabbat Worlds Crusade; Time of Ending begins, the Tyrannic Wars (First Tyrannic War, Second Tyrannic War and Third Tyrannic War), the Badab War, the Wars for Armageddon, the Zeist Campaign, the 13th Black Crusade
- M42 - The Era Indomitus begins which encompasses the Indomitus Crusade, the Psychic Awakening, the War of Beasts, the Plague Wars and the Fourth Tyrannic War.