Jun S. Liu (Chinese: 刘军; pinyin: Liú Jūn; born 1965) is a Chinese-American statistician focusing on Bayesian statistical inference and computational biology. He received the COPSS Presidents' Award in 2002. Liu is a professor in the Department of Statistics at Harvard University and has written many research papers and a book about Markov chain Monte Carlo algorithms, including their applications in biology. He is also co-author of the Tmod software for sequence motif discovery.