Empress Cao

Empress Cao may refer to:

China
These empresses had the surname Cao (曹).
 * Empress Cao (Han dynasty) (died 260), empress of the Han dynasty
 * Empress Cao (Dou Jiande's wife) (fl. 621)
 * Empress Cao (Huang Chao's wife) (died 884)
 * Empress Dowager Cao (Li Cunxu's mother) (died 925), empress dowager of Later Tang
 * Empress Cao (Li Siyuan's wife) (died 937), empress of Later Tang
 * Empress Cao (Song dynasty) (1016–1079), empress of the Song dynasty

Vietnam
These empresses received the posthumous name Empress Cao (Cao Hoàng hậu, 高皇后; "High Empress").
 * Thừa Thiên (empress) (1762–1814), first wife of Emperor Gia Long
 * Thuận Thiên (Nguyễn dynasty empress) (1769–1846), second wife of Emperor Gia Long