The OZ-13MS Gundam Epyon is a mobile suit featured in Mobile Suit Gundam Wing. Originally piloted by Heero Yuy, the suit would later be given to Zechs Merquise.

This mobile suit was created by Treize Khushrenada during the time he was placed under confinement by the Romefeller Foundation. Based on data from the Tallgeese and the other Gundams, and in keeping with Treize's philosophy, the Gundam Epyon, eschews cowardly long-range weapons in favor of chivalrous close combat. However, when the suit becomes a part of White Fang, a pair of vulcan guns are added to the head. Its main weapons are a segmented, whip-like heat rod mounted on a shield, and a powerful beam sword whose energy is supplied by a direct connection to the Epyon's generator. Treize also installed a modified version of the Zero System known as Epyon System in the cockpit, making this suit a powerful opponent. The Epyon can also transform into a "mobile armor" mode (referred to as 'dragon-mode') for high-speed flight and cruising in space. The unit resembles a mythological dragon in this mode, however its primary weapons are inaccessible save for the Epyon Claws which are used as landing gear in this form.