The XGF-02 Gundam Lfrith (XGF-02 ガンダム・ルブリス Gandamu Ruburisu?), aka LF-03, is a mobile suit introduced in Mobile Suit Gundam the Witch from Mercury PROLOGUE. It was piloted by Elnora Samaya during the Vanadis Incident.

This was a prototype MS developed by the Ochs Earth Corporation, a company that was established on Earth. The most prominent feature of this unit was the implementation of the GUND Format, where "GUND"—an innovative body function expansion technology based on artificial limb welfare engineering—was refined for mobile suits. The mobile suits that incorporated the GUND Format and gained cross-disciplinary fighting abilities were collectively called GUND-ARMs, and people across the world soon came to call them "GUNDAMs".