The GAT-X102 Duel Gundam is a mobile suit introduced in the anime Mobile Suit Gundam SEED. It was piloted by Yzak Joule. 

The Duel Gundam is the first unit to be developed in the Earth Alliance's G Project series of prototype MS. Equipped with the new Phase Shift armor that makes it nearly impervious to most physical weapons, the Duel is designed as a general-purpose machine that has well-balanced performance, and also serves as a development base for the other MS in the project.