The RGM-86R GM III is a mass-production general-purpose mobile suit introduced in the anime Mobile Suit Gundam ZZ. Its design was later updated for the novel and OVA Mobile Suit Gundam Unicorn.

A mass-produced mobile suit of the Earth Federation Forces developed in accordance with the "GM III Plan" as a successor to the GM II. It was deployed as the main unit during the First Neo Zeon War. By actively introducing new technologies while maintaining productivity, some specs have acquired performance equal to or higher than Gundam Mk-II's. Its backpack is a mass production model of the Gundam MK-II's, and mobility and maneuverability have exceeded the level of existing mass production machines. Although this backpack has a slightly different shape, it maintains the same functions as the Mk-II's while improving cost performance, and the docking mechanism with the FXA-05D G-Defenser remains. The shoulders and waist can be equipped with missile pods and missile launchers, respectively, allowing the GM III to function as an MS for medium- and long-range support.