Cao Jun (died August or September 259),[a] courtesy name Zi'an, was a prince of the state of Cao Wei in the Three Kingdoms period of China.
[2] Cao Jun was enfeoffed as the Marquis of Mei (郿侯) in 216 during the reign of Emperor Xian in the Eastern Han dynasty.
In 222, he received the title "Prince of Chenliu" (陳留王).
Two years later, his princedom was changed from Chenliu (陳留; around present-day Kaifeng, Henan) to Xiangyi County.
The number of taxable households in Cao Ao's princedom increased throughout the reigns of the Wei emperors until it reached 4,700.