Chen Zhen (died 235),[1][2] courtesy name Xiaoqi, was an official of the state of Shu Han in the Three Kingdoms period of China.

When Liu Bei became Governor of Jing Province, Chen Zhen was hired to serve as a local officer and was stationed in various commanderies.

When Liu Bei entered Yi Province (covering present-day Sichuan and Chongqing), Chen Zhen remained in his service, where he progressed in rank and soon became Prefect of the Masters of Writing at the capital.

When the conflict was settled in 214, Liu Bei further employed him as Commandant of the North District of Shu Commandery (蜀郡北部都尉).

At the same time, Chen Zhen was appointed as Minister of the Guards (衛尉) and was sent with the perilous task to congratulate Sun Quan's ascension.

Both, Sun Quan and him ascended the Altar and together smeared their mouths with blood to pledge to the formed alliance between Wu and Shu.

[b] After his mission was accomplished, Chen Zhen returned to Shu and was given a fief as Marquis of Chengyang Village (城陽亭侯).

Zhuge Liang with his Chief Clerk Jiang Wan and the Palace Attendant Dong Yun about this matter wrote to the court: "When Xiaoqi was previously sent in mission to Wu, he told us that "Zhengfang has scales and shells in his stomach"[c][8] Moreover, that the locals thought of him as someone unapproachable.

I just assumed that when dealing with someone who "has scales and shells in his stomach", It would be a matter of not provoking them and so I could not imagine that there would be another incident like with Su Qin (蘇秦) and Zhang Yi (張儀),[d] hence we were all surprised at this turn of event.

His son Chen Ji (陳濟) inherited his father's title and became the next Marquis of Chengyang Village (城陽亭侯).