Yuan Xie (元勰) (died 508), né Tuoba Xie (拓拔勰, changed 496), courtesy name Yanhe (彥和), formally Prince Wuxuan of Pengcheng (彭城武宣王), later posthumously honored as Emperor Wenmu (文穆皇帝) with the temple name of Suzu (肅祖), was an imperial prince of the Chinese/Xianbei dynasty Northern Wei. He was a son of Emperor Xianwen, and he often assisted his brother Emperor Xiaowen both in military and governmental matters. After Emperor Xiaowen's death, he briefly served as regent for Emperor Xiaowen's son Emperor Xuanwu. Eventually, due to suspicions and jealousy of Emperor Xuanwu's uncle Gao Zhao, Emperor Xuanwu believed false reports that Yuan Xie was going to rebel, and forced him to commit suicide. He was later posthumously honored as an emperor by his son Emperor Xiaozhuang, although subsequently Emperor Jiemin retracted the honors.
It is not known when Tuoba Xie was born, but he was a younger brother to Emperor Xiaowen and was younger to all of the six other sons of their father Emperor Xianwen except Tuoba Xiang (拓拔詳) the Prince of Beihai. His mother was Consort Pan, who died shortly after giving birth to him. In 476, his father Emperor Xianwen (who was then retired emperor after having passed the throne to Emperor Xiaowen in 471) died as well, probably having been poisoned by Tuoba Xie's step-grandmother Empress Dowager Feng, who then assumed regency over Emperor Xiaowen as grand empress dowager. Tuoba Xie was considered studious and well-mannered in his youth, and was much favored by both Emperor Xiaowen and their step-grandmother Grand Empress Dowager Feng.