Halo: Contact Harvest is a military science fiction novel by Joseph Staten, based on the Halo series of video games. The book was released in October 2007 and is the fifth Halo novel, following 2006's Halo: Ghosts of Onyx, written by Eric Nylund. Staten is a longtime employee of Bungie, the developer of the Halo video game series; he directed the cut scenes in the video games and is a major contributor to Halo's storyline. He set out to write a novel that appealed to gamers, as well as those who had never read a Halo novel.
Set in 2525, twenty-seven years before the events of Halo: Combat Evolved, the novel tells the story of the United Nations Space Command's first encounter with the alien collective known as the Covenant on the colony world of Harvest, and the beginning of the long war that follows.