The Halo novels are books that have expanded heavily on the Halo universe. The first three novels were published by Ballantine Books, while the more recent ones are published by Tor Books. The first three Halo novels were reissued by Tor Books in 2010. While mostly unchanged, the new versions feature additional content and several minor alterations. This is a list of all of the novels:
 List of novels
 Individual novels
|Halo: The Fall of Reach||Eric Nylund||2001||Details the SPARTAN-II Program, the Covenant attack on Reach, and how the UNSC Pillar of Autumn escaped to Halo.|
|Halo: The Flood||William C. Dietz||2003||The novelization of Halo: Combat Evolved. Also features a number of additional subplots which explain what happened during the events on Installation 04.|
|Halo: First Strike||Eric Nylund||2003||Fills in the gap between Halo: Combat Evolved and Halo 2.|
|Halo: Ghosts of Onyx||Eric Nylund||2006||Follows Kurt-051 and the training of the Spartan-IIIs on Onyx.|
|Halo: Contact Harvest||Joseph Staten||2007||Follows Avery Johnson and features the events leading up to the Human-Covenant War.|
|Halo: The Cole Protocol||Tobias S. Buckell||2008||Introduces Gray Team and details the backstories of Jacob Keyes and Thel 'Vadam.|
|Halo: Cryptum||Greg Bear||2011||Describes the experiences of the Forerunner Manipular known as Bornstellar Makes Eternal Lasting and the Didact during the Forerunner-Flood war.|
|Halo: Primordium||Greg Bear||2012||Details the story of a human known as Chakas and his odyssey across Installation 07.|
|Halo: Silentium||Greg Bear||2013||Concludes the Forerunner Saga.|
|Halo: Glasslands||Karen Traviss||2011||Details the state of the Halo universe after the end of the Human-Covenant War and serves as a follow-up to Ghosts of Onyx.|
|Halo: The Thursday War||Karen Traviss||2012||A direct sequel to Glasslands.|
|TBA||TBA||Karen Traviss||TBA||Concludes the trilogy.|
 Collections and box sets
- Halo: Evolutions - Essential Tales of the Halo Universe, a collection of short stories relating to the Halo universe by several critically acclaimed authors.
- Halo Box Set, the box set featuring the three first Halo novels by Del Rey Books.
- Halo Boxed Set, featuring the first three novels by Tor Books.
Contrary to popular belief, the Halo novelisation project was initiated by Microsoft Game Studios Franchise Development Group and not by Bungie Studios (though they are given a degree of creative control). The novelisation project was designed for wider audience apart from the general fanbase, and to establish an expanded universe for future content.
- ^ Halo: Combat Evolved portal page: MGS Development Group Expands (archived page)
- ^ IGN: Beyond the Ring: Bungie's Renegade Development of Halo's Fiction (Staten said, emphasizing Bungie's role in outside projects: "Bungie was maintaining creative oversight over all these initiatives -- we really did have a lot of control over what stories got told. Historically, over the decade of Halo storytelling, Bungie would maintain creative ownership and direction of these various projects.")