Cao Jie (fl.125–181), courtesy name Hanfeng, was a Chinese court eunuch and politician during the Eastern Han dynasty.
In 168, due to his efforts in helping to install Emperor Ling on the throne, he was enfeoffed as the "Marquis of Chang'an District" (長安鄉侯).
When Cao Jie and the eunuch faction heard that Dou Wu and Chen Fan's faction were planning to eliminate them, they launched a coup against their rivals with the aid of Wang Fu (王甫), Zhu Yu (朱瑀), Gong Pu (共普), Zhang Liang (張亮) and others.
However, their attempt failed when two officials – Chen Qiu (陳球), the Minister of Justice (廷尉); and Li Xian (李咸), the Grand Commandant (太尉), – managed to convince Emperor Ling to hold an empress's funeral for the empress dowager and bury her beside Emperor Huan.
Emperor Ling rewarded Cao Jie and Wang Fu for exposing Liu Kui's "treachery" by increasing the number of taxable households in their marquisates.