Yu Guangyuan (Chinese: 于光遠; pinyin: Yǘ Guāngyuǎn; born as 郁鐘正; pinyin: Yü Zhōngzhèng; 5 July 1915 – 23 September 2013) was a Chinese economist, philosopher, and a senior official of the People's Republic of China. Yu was recognized as one of the first proponents of the socialist market-oriented economic system in China and the theory of "the Primary Stage of Socialism". He was a close adviser of and speech-writer for the Chinese leader Deng Xiaoping.