The Orange Box is a video game compilation for Microsoft Windows, Xbox 360, PlayStation 3, OS X and Linux. The Windows and Xbox 360 versions were produced and published by Valve Corporation and released on October 10, 2007, as a boxed retail copy. A Windows-only download through Valve's Steam service was released the previous day.

The PlayStation 3 version was published by Electronic Arts and released in North America and Europe on December 11, 2007. Valve also released a soundtrack containing music from the games within the compilation. The compilation contains five games, all powered by Valve's Source engine. Two of the games included, Half-Life 2 and its first stand-alone expansion, Episode One, had previously been released as separate products. Three new games were also included in the compilation: the second stand-alone expansion, Half-Life 2: Episode Two, the puzzle game Portal, and Team Fortress 2, the multiplayer game sequel to Team Fortress Classic. A separate product entitled The Black Box was planned, which would have included only the new games, but was cancelled.

The Orange Box received critical acclaim, with Portal being recognized as a surprise favorite of the package. The PlayStation 3 version of The Orange Box was noted for several technical shortcomings that were not present in the other versions, only a few of which were fixed through a single patch.