Empress Dowager Bian (30 December 159 – 9 July 230), also known as Lady Bian, formally known as Empress Wuxuan, was an empress dowager of the state of Cao Wei during the Three Kingdoms period. She was the wife of Cao Cao, a warlord who rose to power in the late Eastern Han Dynasty and laid the foundation of Wei. She bore Cao Cao's successor, Cao Pi, who ended the Han Dynasty and founded Wei in 220 after his father's death.