The RGM-89 Jegan is a mass-produced general-purpose mobile suit introduced in Mobile Suit Gundam: Char's Counterattack.

A state-of-the-art machine adopted by the Earth Federation Forces in U.C. 0089 as its main force mobile suit, the Jegan comes from the lineage of the RGM-79 GM as inferred by its "RGM" model number. However, it was not developed by the Earth Federation Forces' own engineers like most previous RGM series mobile suit. Instead, it was produced and supplied by the Anaheim Electronics (AE). Created through combining the Earth Federation Forces' expertise of the GM series with AE's MS development technologies, the Jegan's performance is significantly higher than the RGM-86R GM III. It also has improved productivity due to the use of Titanium Alloy Ceramic Composite armor, as well as high operability, and excellent versatility. All these allows it to become the "next-generation standard MS", and it operated as the main force MS for a long period of time. Several variations of the MS were also developed. The original Jegan is sometimes referred to as "Jegan Type-A" to differentiate it from later variants, and should not be confused with the later RGM-89R Jegan A-Type.

The Jegan highly exemplified the original concept of MS being "mobile infantry for melee combat", and is designed for close combat in and around space colonies. It can also operate under gravity without any modifications. With a backpack containing a single main thruster, two small thrusters at the bottom, and two articulated vernier arms at the top, the Jegan's thrust and acceleration performance could match-high mobility-type machines from the Gryps War-era. Its backpack also featured exchangeable propellant tanks. Also notable are the verniers for attitude controls on the front shoulder armor, enlarged centre shoulder armor sections to fit the side thrusters, and a calf-mounted thruster on each leg. The use of lightened armor grants the machine high maneuverability, its front skirt armor is removed to maintain the legs' range of articulation, while its head has a long-range sensor installed in the forehead in addition to the fixed main sensors. The Jegan is armed with mainly short-range weaponry, including a beam saber, a short-range type beam rifle, three hand grenades, a vulcan pod system, and a shield with twin missile launchers.