The Halo novels are books that have expanded heavily on the Halo universe. Contrary to popular belief, the Halo novelization project was initiated by Microsoft Game Studios Franchise Development Group and not by Bungie Studios (though they were given a degree of creative control). The novelization project was designed for wider audience apart from the general fanbase, and to establish an expanded universe for future content. Following the advent of 343 Industries and their philosophy of expanded connectivity between Halo media, the writing process of the novels has become more extensively intertwined with the planning of the stories of the games and other fiction.
The first three novels were published by Ballantine Books, while the more recent ones are published by Tor Books. The three initial Halo novels were reissued by Tor Books in 2010. While mostly unchanged, the new versions feature additional content and several 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 expand on the events on Installation 04.|
|Halo: First Strike||Eric Nylund||2003||Fills in the gap between Halo: Combat Evolved and Halo 2, explaining the Master Chief's return to Earth and the survival of a number of characters from Reach and Halo.|
|Halo: Ghosts of Onyx||Eric Nylund||2006||Follows Kurt-051, the training of the Spartan-IIIs on Onyx, and the three-sided battle for the planet in 2552.|
|Halo: Contact Harvest||Joseph Staten||2007||Follows Avery Johnson and features the events leading up to first contact with the Covenant at Harvest and the beginning of 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||Recounts the twilight years of the Forerunner civilization, the Ur-Didact's descent into insanity, and the firing of the Halo Array.|
|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||Continues the story of Kilo-Five and humanity's involvement in the Sangheili civil war.|
|Halo: Mortal Dictata||Karen Traviss||2014||Focuses on the Venezian rebel movement threatening Earth and the terrorist Staffan Sentzke's connection to Kilo-Five's Naomi-010.|
 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.
- ^ 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.")
- ^ YouTube: SDCC 2011: Halo Universe Panel Part 1