The XXXG-00W0 Wing Gundam Zero (ウイングガンダムゼロ Uingu Gandamu Zero?) (aka Wing Zero, Wing 0, or just Zero) is a mobile suit that appears in Mobile Suit Gundam Wing.

Wing Zero was the first Gundam designed by the five engineers who had developed the OZ-00MS Tallgeese. Around A.C. 175, the MS, which was developed as a "weapon" by OZ, began to evolve as an epoch-making mobile weapon based on the Tallgeese (Prototype Leo). Meanwhile, several engineers that were at the core of the Tallgeese development ran away from OZ to develop even higher performance MS. Five of them gathered to develop a MS that would adopt "technology and materials that did not yet exist at that point in time", including "Gundanium", which was a cutting-edge material at that time. Having been developed in light of the Tallgeese's failure, it became a dreadful machine equipped with an interface that transcended the limits of the pilot. That is "Wing Zero", and the material adopted gave it the code name "Gundam". By transforming into Neo Bird Mode, high-speed cruising is possible; in addition, the Twin Buster Rifle has the power to destroy a space colony in a single hit.

Wing Zero's head unit is an aggregation of various sensors and head Vulcan Guns are not equipped. Its chest unit is equipped with the main generator and a "ZERO System" built-in type cockpit. The ZERO System also turned out to be what the five engineers feared the most as it forced the pilot to achieve the "perfect victory". The five engineers, harboring a fear of the dimension of Wing Zero's excessive destruction coefficient (in practice, the parts with the required specifications could not have been supplied at that point in time), suspended the machine's development and sealed its design data. In hiding, the five engineers who had returned to their respective base colonies would develop five "Gundams" that could be said to be unique Wing Zero-derived machines. And then in A.C. 195, the seal was broken by Quatre Raberba Winner, one of the five Gundam pilots who had carried out Operation Meteor; and Wing Zero, which had been impossible to build at the time of its design, is born.