Cheng Siwei (June 1935 – 12 July 2015) was a Chinese economist, chemical engineer and politician. He was the Chairman of China Soft Science Research Association; President of the Chinese Society for Management Modernization; Director of the Research Center on Fictitious Economy and Data Science, Chinese Academy of Sciences; Dean of the School of Management of the Graduate University of the Chinese Academy of Sciences and Honorary President of East China University of Science and Technology.