Cao Xun (231 – September or October 244) was an imperial prince of the state of Cao Wei in the Three Kingdoms period of China. He was an adopted son of Cao Rui, the second emperor of Wei. While the identities of his parents are unknown, Cao Xun was allegedly a son of Cao Kai (曹楷), the son of Cao Zhang (Cao Rui's uncle).(魏氏春秋曰：或云任城王楷子。) Wei Shi Chunqiu annotation in Sanguozhi vol. 4.(明帝無子，養王及秦王詢；宮省事祕，莫有知其所由來者。) Sanguozhi vol. 4. On 23 September 235, Cao Rui enfeoffed Cao Xun as the Prince of Qin (秦王).([青龍三年]八月庚午，立皇子芳為齊王，詢為秦王。) Sanguozhi vol. 3. Cao Xun died sometime between 19 September and 18 October 244.
See also Lists of people of the Three Kingdoms
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References
Chen, Shou (3rd century). Records of the Three Kingdoms (Sanguozhi). Pei, Songzhi (5th century). Annotations to Records of the Three Kingdoms (Sanguozhi zhu).