Fei Guan (?-?) was brother of the wife of Yi Lieutenant Governor Liu Zhang. After Liu Bei took Luo Castle, Fei Guan lied in wait for him at Mian Zhu. He sent Li Yan to engage Liu Bei, but he was captured. Later, it would be Li Yan that convinced Fei Guan to surrender to Liu Bei. He waas later called upon by Liu Bei at Chengdu.