Li Xiucheng (1823 – August 7, 1864) is an eminent military leader of the Taiping Rebellion, and known during his military tenure as the Loyal King and "Loyal Prince Lee" by Western Sources.

This title is given because a Qing general attempted to bribe him to kill Hong Xiuquan, but he refused and told Hong Xiuquan.

His many victories also make Hong very happy.

He serves loyally under Hong Xiuquan's Taiping Administration and leads Taiping forces to many military victories.

He is executed by Zeng Guofan after interrogation in 1864.

Li is the most important general during the latter part of the Taiping Rebellion.