Zhang Yan (died 163 BC), known formally as
Empress Xiaohui (孝惠皇后) was an empress during the
Han Dynasty. She was the daughter of
Princess Yuan of Lu (the only daughter of
Emperor Gao (Liu Bang) and his wife
Empress Lü) and her husband
Zhang Ao (張敖, son of Zhang Er), the Prince of Zhao and later Marquess of Xuanping.