From Halopedia, the Halo wiki
- March 19: Halo: Silentium, the third and final novel of the Forerunner Saga, is released.
- March 29: Forge Island is released.
- April 8: The Castle Map Pack is released.
- April 9: Halo 4: Original Soundtrack Volume 2 is released.
- May 21: Halo: The Television Series is announced for the Xbox One in Microsoft's keynote conference.
- May 27: The Halo 4: Forward Unto Dawn Deluxe Edition Blu-ray/DVD Combo is released for Region 2.
- June 10: Halo 5: Guardians is announced at E3 2013.
- June 21: Microsoft announced that the Reclaimer Trilogy was expanded into the Reclaimer Saga.
- July 10: Halo 4: Forward Unto Dawn Original Soundtrack is released.
- July 18: Halo: Spartan Assault and its soundtrack are released.
- August 14: The first issue of Halo: Initiation is released.
- August 20: The Bullseye Map Pack, Infinity Armor Pack and Steel Skin Pack are released.
- August 29: Operation F: Hydra is released as a title update for Halo: Spartan Assault.
- August 30: An Emile-A239 figure made by ThreeA was released.
- September 11: The second issue of Halo: Initiation is released.
- September 16: Halo 4: The Essential Visual Guide is released.
- Unknown date: The second series of Halo 4 McFarlane Toys is released.
- October 8: Halo 4 Game of the Year Edition is released.
- October 9: The third and final issue of Halo: Initiation is released.
- October 15: Halo: Oversized Collection is released.
- December 6: The Halo 4: The Master Chief limited-edition statue is released by McFarlane Toys.
- December 11: The first issue of Halo: Escalation is released.
- December 23: Halo: Spartan Assault is released on Xbox One.
- ^ Tor Books reveals title, cover art, and release date of the third Halo novel by legendary science fiction author Greg Bear
- ^ Halo Waypoint, Welcome to Forge Island
- ^ Joystiq: Microsoft, Steven Spielberg Working on Halo: The Television Series
- ^ CVG: Halo 4: Forward Unto Dawn gets Blu-ray/DVD release in May
- ^ IGN - Halo Reclaimer Trilogy Expanded to "Saga"
- ^ Computer and Videogames.com - Halo Reclaimer Trilogy expanded to a "saga", says MS exec
- ^ Halo Waypoint - Halo: Spartan Assault
- ^ Soundtrack.net - Halo: Spartan Assault
- ^ Wired.com: First Look: Dark Horse Debuts New Halo Comic Series
- ^ Halo Waypoint: Champions Bundle Trailer
- ^ Halo Waypoint - New Operation Hydra Screenshots
- ^ [World of ThreeA - HALO - Emile A-239 Spartan-III 1/6th Scale Collectible Figure]
- ^ Dark Horse - Halo: Initiation #2
- ^ DK.co.uk: Halo 4 The Essential Visual Guide
- ^ IGN.com - Halo 4 Game of the Year Edition Outed
- ^ Halo Waypoint - Halo 4: Game of the Year Edition
- ^ Dark Horse - Halo: Initiation #3
- ^ Wired.com: Dark Horse Will Turn World of Halo 4 Into Ongoing Comic Series
- ^ Halo Waypoint - Halo: Spartan Assault Is Coming to Xbox One and Xbox 360
- ^ Halo Waypoint - Halo: Spartan Assault Release Date Revealed
- ^ Xbox The Official Magazine - Halo: Spartan Assault is out now for Xbox One