- January 20-30: The Halo Wars 2 Blitz Beta was available.
- February 17: The Forge Leader DLC for Halo Wars 2 was released for free, ahead of the Halo Wars 2 release.
- February 21: Halo Wars 2 was released.
- February 22: Halo Wars: Definitive Edition left early access.
- March 20:
- The Kinsano Leader DLC for Halo Wars 2 was released.
- Through an update, achievements were added to the earlier released Forge Leader DLC, as well as three new ones related to the game's Campaign logs.
- April 20: Halo Wars: Definitive Edition was henceforth available separately from the Halo Wars 2: Ultimate Edition.
- April 25: Halo: Envoy was released.
- April 28: The Colony Leader DLC for Halo Wars 2 was released.
- May 22: The Sergeant Johnson Leader DLC for Halo Wars 2 was released.
- June 13: The Halo Wars 2 expansion Awakening the Nightmare is officially revealed, alongside the next two Leader DLCs; Jerome-092 and Arbiter Ripa 'Moramee.
- June 21: The Icons of War DLC containing Commander Jerome and The Arbiter Leader Packs for Halo Wars 2 was released.
- June 27: Halo: Escalation Library Volume #2 was released.
- August 17: The Yapyap the Destroyer Leader DLC for Halo Wars 2 was released.
- August 29: Halo: Retribution was released.
- August 30: Halo: Rise of Atriox Issue 1 was released.
- September 5: Halo: Warfleet was released.
- September 20: Halo: Rise of Atriox Issue 2 was released.
- September 26: The Awakening the Nightmare DLC is released for Halo Wars 2.
- October 17: Halo Recruit was released.
- October 18: Halo: Rise of Atriox Issue 3 was released.
- October 24: Halo: Adult Coloring Book was released.
- November 14: Halo: Legacy of Onyx was released.
- December 13: Halo: Rise of Atriox Issue 4 was released.