Halo: The Fall of Reach is a military science fiction novel by Eric Nylund, set in the Halo universe, and acts as a prelude to Halo: Combat Evolved, the first game in the series. The book was released in October 2001 and is the first Halo novel. It takes place in the 26th century across several planets and locations. The novel details the events which led up to the game and explains the origins of the SPARTAN-II supersoldiers, narrating the story of the series protagonist, the Master Chief.

Halo is a military science fiction media franchise, originally developed and created by Bungie and currently managed and developed by 343 Industries, part of Microsoft's Xbox Game Studios. The series launched in 2001 with the first-person shooter video game Halo: Combat Evolved and its tie-in novel, The Fall of Reach. The latest main game, Halo Infinite, was released in late 2021.