|Prince of Cao Wei|
|Courtesy name||Zi'an (Chinese: 子安; pinyin: Zǐ'ān; Wade–Giles: Tzu-an)|
Cao Jun (died 259), courtesy name Zi'an, was a prince in the state of Cao Wei in the Three Kingdoms period. He was a son of Cao Cao, a warlord who rose to prominence towards the end of the Han Dynasty and laid the foundation of Wei.
Cao Jun was enfeoffed as the "Marquis of Mei" (郿侯) in 216 during the reign of Emperor Xian in the Eastern Han Dynasty. His marquisate was changed to Xiangyi County (襄邑縣; present-day Sui County, Shangqiu, Henan) in the following year.
In 221, a year after Cao Jun's elder half-brother Cao Pi ended the Han Dynasty and established the state of Cao Wei, Cao Jun was promoted from a marquis to a duke. In 222, he received the title of "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. In 232, during the reign of Cao Pi's son Cao Rui, Cao Jun's princedom was relocated back to Chenliu. Cao Jun died in 259 during the reign of Cao Mao.
Cao Jun was succeeded by his son, Cao Ao (曹澳). The number of taxable households in Cao Ao's princedom increased throughout the reigns of the Wei emperors until it reached 4,700.
- The Sanguozhi stated that Cao Jun died in the 4th year of the Ganlu era (256-260) in Cao Mao's reign. Quote from Sanguozhi vol. 20: (甘露四年薨。)
- (武皇帝二十五男： ... 秦夫人生濟陽懷王玹、陳留恭王峻， ...) Sanguozhi vol. 20.
- (陳留恭王峻字子安，建安二十一年封郿侯。二十二年，徙封襄邑。黃初二年，進爵為公。三年，為陳留王。五年，改封襄邑縣。太和六年，又封陳留。甘露四年薨。) Sanguozhi vol. 20.
- (子澳嗣。景初、正元、景元中，累增邑，并前四千七百戶。) Sanguozhi vol. 20.