343 Industries is an American video game developer located in Redmond, Washington, part of Xbox Game Studios. Headed by Pierre Hintze, the studio is responsible for the Halo series of military science fiction games, originally created and produced by Bungie, and is the developer of the Slipspace Engine. Named after the Halo character 343 Guilty Spark, the studio was established in 2007 after the departure of Bungie.

After co-developing downloadable content for Halo: Reach, Bungie's final Halo game, 343 Industries released Halo: Combat Evolved Anniversary and Halo 4, the latter starting the studio's "Reclaimer Saga" of the mainline games.