The MS-07B-3 Gouf Custom is an upgraded variant of the MS-07B Gouf that was introduced shortly after the MS-09B Dom. It first appeared in the anime Mobile Suit Gundam: The 08th MS Team.

During the deployment of the Gouf, its limited combat versatility became evident with its design concept of emphasis on hand-to-hand combat. Numerous disadvantages surfaced during operation on the battlefield, such as lack of flexibility due to the Gouf's fixed armament. The Gouf would be completely redesigned as the MS-07B-3, which was an improvement over the original. The Gouf Custom was designed with improved close quarters shooting and detachable weapons. It was designed primarily for ace pilots preferring a lighter mobile suit that could leap and jump as opposed to the heavy, yet effective MS-09B Dom.

The Gouf Custom featured multiple changes to the MS-07B, including the elimination of the awkward five finger 75mm machine guns, replacing it with a normal manipulator and a wrist mounted 3-barrel 35mm Machine gun. The coil-like heat rod is replaced with a magnetic grappler wire that connects and disables an enemy with an electric charge rather than damaging them. The grappler wire could also be used as a repelling line that could slow or even halt the descent of a falling Gouf in the right conditions. The shield of the Gouf was modified so that it not only stored the Gouf's heat sword but is also capable of carrying a 75mm gatling gun, greatly enhancing the mobile suit's fire power.