Cao County (pinyin: Cáo Xiàn) is a county in Heze City, Shandong Province, China.
Cao Xian may also refer to:
Cao Xian (scholar) (541–645), scholar of the Chen dynasty, the Sui dynasty, and the Tang dynasty Cao Xian (Cao Wei), Chinese noble woman of the aristocrat Cao family during the Three Kingdoms period