Xin Xianying (191–269) was a Chinese noblewoman, aristocrat and advisor who lived during the Three Kingdoms period. She was the daughter of Xin Pi, an official of the state of Cao Wei. The only extant historical source about her life is her biography written by her maternal grandson, Xiahou Zhan (夏侯湛), who was a notable scholar and official of the Jin dynasty. She is best known for giving advice to her family members and relatives during significant events in the history of Cao Wei such as the Incident at Gaoping Tombs and Zhong Hui's Rebellion.