Fallout: Brotherhood of Steel is an action role-playing game developed and published by Interplay Entertainment, and distributed in Europe by Avalon Interactive for the Xbox and PlayStation 2. Released on January 14, 2004, Fallout: Brotherhood of Steel was the fourth video game to be set in the Fallout universe. It was also the first to be made for consoles, and the last to be made during Interplay's initial run on the series, before the rights passed to Bethesda Softworks. The game chronicles the adventures of an initiate in the fictional Brotherhood of Steel, a militant quasi-religious organization that has come to power in a post-apocalyptic world.

Bethesda Softworks declared the game to be non-canon to the Fallout series.