Empress Deng Mengnü (鄧猛女) (died 165), also briefly known as Liang Mengnü (梁猛女) then as Bo Mengnü (薄猛女), was an empress during Han Dynasty. She was the second wife of Emperor Huan.
Deng Mengnü's father Deng Xiang (鄧香) was a low level official in the imperial administration. (It is not clear under which emperor(s) he served.) He was a cousin of Empress Deng Sui and therefore a grandson of the statesman Deng Yu. Deng Mengnü's mother was named Xuan (宣). Deng Xiang died early, and after he did, Lady Xuan remarried Liang Ji (梁紀—note different character than the Liang Ji referenced below), the uncle of Sun Shou (孫壽), the wife of the powerful official Liang Ji (梁冀), who dominated the political scene throughout the reigns of Emperor Huan and his two predecessors, Emperors Chong and Zhi, as the brother of the regent Empress Dowager Liang.
After Lady Xuan remarried, Deng Mengnü lived for a while with her mother and her stepfather. Because she was beautiful, Liang Ji and Sun Shou had offered her to Emperor Huan to be an imperial consort—and adopted her and changed her family name to Liang. After the death of Liang Ji's sister Empress Liang Nüying in 159, Liang Ji was hopeful to continue to use her to control Emperor Huan and hoped that she would become empress. To completely control her, Liang Ji planned to have her mother, Lady Xuan, killed, and in fact sent assassins against her, but the assassination was foiled by the powerful eunuch Yuan She (袁赦), a neighbor of Lady Xuan. This set in motion a series of events that led to Liang Ji's downfall, as Emperor Huan, angry about the assassination attempt, formed a conspiracy with five powerful eunuchs and overthrew Liang in a coup d'etat later in 159. The Liang and Sun clans were slaughtered.