The GFAS-X1 Destroy Gundam is a transformable heavy assault mobile suit introduced in the anime Mobile Suit Gundam SEED Destiny.

As its name implies, the GFAS-X1 Destroy Gundam is built for only one purpose: massive destruction. Nearly three times larger than an average MS, it can destroy an enemy mobile suit by simply stepping on it. To accomplish its goal of mass destruction, the unit is equipped with a large array of weapons that allow it to singlehandedly devastate a large city like Berlin or take out an army of mobile suits and support crafts. Its designation, "GFAS-X", stands for "Gressorial Fortress Armament Strategic - EXperimental".

Despite its large size, the Destroy Gundam requires only a single pilot unlike its predecessor, the YMAG-X7F Gells-Ghe. However, the pilot has to be a Biological CPU or someone with similar enhancements. The Destroy Gundam is classified as a transformable mobile suit, and usually launches in its MA mode which hovers over the ground at low altitudes through the use of backpack mounted thrusters. It can transform into MS mode by rotating its lower half 180 degrees, lowering the arms and flipping the backpack to the back.

The suit's backpack is equipped with three weapons, including two twin barrel high-energy beam cannons, 20 thermal plasma composite cannons mounted around the backpack's circumference, and four 6-tube multipurpose missile launchers. Other weapons include head-mounted 200mm energy cannon and four 75mm CIWS, three chest-mounted 1580mm multi-phase energy cannons, and two detachable arms each equipped with a beam cannon and 5-barrel hand beam gun. The detachable arms function like DRAGOON Pods, allowing the suit to attack its target at any range, regardless of obstacles standing in the way. Aside from its vast array of offensive weaponry, the Destroy Gundam also carries defensive equipment in the form of three positron reflector shields, one in the backpack and usable only in MA mode, and two on the detachable arms.

Due to its bulk, the Destroy Gundam has poor mobility and serves more as a movable gun platform. This weakness is often exploited by enemy units, particularly high mobility mobile suits piloted by ace pilots, to take the Destroy Gundam down by closing in and using close combat beam weaponry. Alternatively, DRAGOON Pods armed with beam spikes (such as the large DRAGOON Pods of the ZGMF-X666S Legend Gundam) can penetrate the Destroy's Positron Reflectors and quickly tear through the machine.