F/D-20 Zowort Heavy is a mobile suit introduced in Mobile Suit Gundam the Witch from Mercury.

The Zowort Heavy is a combat-oriented model of the F/D-19 Zowort with significant upgrades. Its components have been treated to allow sustained use in multitudes of harsh environments in atmospheric conditions. Its stability in flight has also been improved over the basic model giving it a surplus loading capacity enabling large-scale firearms to be mounted on the back which is unrecomended for the Zowort. The left and right sides of the backpack could be outfitted with heavy weaponry depending on the pilot's requirements.