Liu Yuh-san (; born 30 October 1944) is a Taiwanese politician and engineer.

Education Liu graduated from National Cheng Kung University with a bachelor's degree in management science in 1968. He then earned a master's degree in urban planning from National Chung Hsing University, a Master of Engineering (M.E.) in systems engineering from the Asian Institute of Technology in 1975, and, in 1986, a Ph.D. in civil engineering from National Cheng Kung University.

Political career He was the Secretary-General of the Executive Yuan from 2006 to 2007. Liu then served as a member of the Control Yuan from 2008 to 2014.

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