Halo novels

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:

Individual novels

 * Halo: The Fall of Reach, by Eric Nylund, which details the SPARTAN-II Program, the Covenant attack on Reach, and how the escaped to Halo.
 * Halo: The Flood, the novelization of Halo: Combat Evolved by William C. Dietz. The Flood also features several side stories.
 * Halo: First Strike, by Eric Nylund, fills in the gap between Halo: Combat Evolved and Halo 2.
 * Halo: Ghosts of Onyx, by Eric Nylund, follows Kurt-051 and the training of the Spartan-IIIs on Onyx.
 * Halo: Contact Harvest, by Joseph Staten, follows Avery Johnson and features the events leading up to the Human-Covenant War.
 * Halo: The Cole Protocol, by Tobias S. Buckell, introduces Gray Team and details Jacob Keyes' backstory.

Collections and novel series

 * Halo: Evolutions - Essential Tales of the Halo Universe, a collection of short stories relating to the Halo universe by several critically acclaimed authors.
 * The Forerunner Saga, by Greg Bear, is a three-part series that explores the Forerunner society, the Forerunner-Flood War and the events leading up to it.
 * Halo: Cryptum, the first novel in the series.
 * Unnamed Halo novel series, by Karen Traviss, is a trilogy that explores the aftermath of the Human-Covenant War after the end of Halo 3.
 * Ghosts of Onyx sequel - a yet-unnamed follow-up to Ghosts of Onyx.

Box sets

 * 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.