There are 3 series with the name: The Horus Heresy
The Horus Heresy Books in Order
Books by Various and Others1. Horus Rising (2006)
2. False Gods (2012)
3. Galaxy in Flames (2014)
5. Fulgrim
7. Legion
9. Mechanicum (2014)
10. Tales of Heresy (2014)
11. Fallen Angels (2018)
12. A Thousand Sons
13. Nemesis
14. The First Heretic (2017)
15. Prospero Burns (1605)
16. Age of Darkness
17. The Outcast Dead (2011)
18. Deliverance Lost (1800)
19. Know No Fear (2013)
20. The Primarchs (2015)
21. Fear to Tread (2012)
22. Shadows of Treachery (2012)
23. Angel Exterminatus (2012)
24. Betrayer (2012)
25. Mark of Calth (2013)
26. Vulkan Lives (2013)
27. The Unremembered Empire (2013)
28. Scars (2014)
29. Vengeful Spirit (2014)
30. The Damnation of Pythos (2014)
31. Legacies of Betrayal (2014)
32. Deathfire (2015)
33. War Without End (2016)
34. Pharos (2016)
35. Eye of Terra (2016)
36. The Path of Heaven (2016)
37. The Silent War: Chosen of the Sigillite (2016)
38. Angels of Caliban (2016)
39. Praetorian of Dorn (2016)
41. The Master of Mankind (2016)
42. Garro (2017)
43. Shattered Legions (2017)
44. The Crimson King (2018)
45. Tallarn (2019)
46. Ruinstorm (2019)
47. Old Earth (2018)
48. The Burden of Loyalty (2019)
49. Wolfsbane (2018)
50. Born of Flame (2019)
51. Slaves to Darkness (2020)
52. Heralds of the Siege (2020)
53. Titandeath (2020)
54. The Buried Dagger (2020)
The Horus Heresy Omnibuses Books in Order
Books by Dan Abnett and OthersThe Horus Heresy Primarchs Books in Order
Books by Graham McNeill and Others1. Roboute Guilliman: Lord of Ultramar (2016)
2. Leman Russ: The Great Wolf (2017)
3. Magnus the Red: Master of Prospero (2017)
4. Perturabo: The Hammer of Olympia (2017)
5. Lorgar: Bearer of the Word (2017)
6. Fulgrim: The Palatine Phoenix (2018)
7. Ferrus Manus: The Gorgon of Medusa (2018)
8. Jaghatai Khan: Warhawk of Chogoris (2018)
9. Vulkan: Lord of Drakes (2018)
10. Corax: Lord of Shadows (2019)
11. Angron: Slave of Nuceria (2019)
12. Konrad Curze: The Night Haunter (2019)
13. Lion El'Jonson: Lord of the First (2020)
14. Alpharius: Head of the Hydra (2021)