Xu Zhixun (徐知詢) (died 934), formally Prince Kang of Donghai (東海康王), was the second biological son of Xu Wen, the regent of the Chinese Five Dynasties and Ten Kingdoms period state Wu. He had tried to, during Xu Wen's lifetime, displace his older adoptive brother Xu Zhigao as the junior regent, but was unable to do so. After Xu Wen's death, he tried to contend for control of the Wu state with Xu Zhigao, as he inherited the command of the large army under Xu Wen's command, but was later detained and stripped of the command by Xu Zhigao. He later continued to serve as a general of the Wu state but without sufficient power to again challenge Xu Zhigao.