Cheng Wei-yuan (traditional Chinese: 鄭為元; simplified Chinese: 郑为元; pinyin: Zhèng Wèiyuán; 20 January 1913 – 3 August 1993) was a Taiwanese politician.

He was the only Minister of National Defense (1987-1989) with the complete personal achievements in all the 4 power systems (Kuomintang, Politics, Military and Intelligence) in the ROC history.

Being one of the few top-rank KMT generals sympathizing the victims by the Martial Law operation during White Terror and supporting the democratic modernization trend of the state;[1] he kept the open-mind policy of communication to cooperate with the demands of parliament, media and societies, including the subtle relation with the newly founded Democratic Progressive Party.

[2] Minister Cheng always maintained the gentlemanship attitude with positive humour in response to smooth chaotic situation, such as once being confronted by a legislator famous for the violent behavior pattern at the time, he replied with a poet piece by Master Su Shi 927 years ago.

[13][5] He was awarded the Order of Blue Sky and White Sun by President Lee Teng-hui to appreciate his contribution to the military reform and democracy,[14] [15] nonetheless he remained the humble attitude in respect to the state, hence requested his family not to show off the medal in the public memorial as per the ROC military custom after his death.