Liu Zhengjun (Chinese: 刘成军; born 1949) is a retired general (shang jiang) of the People's Liberation Army Air Force (PLAAF) of China.
He served as Vice Commander of the PLAAF and President of the PLA Academy of Military Science.
Liu was born in Chengwu County, Shandong Province.
In December 2004, he was promoted to the post of vice commander of the PLA Air Force.
In 2007, he succeeded general Zheng Shenxia as President of PLA Academy of Military Science.