Yuan-Shih Chow (Chinese: 周元燊, Pinyin: Zhōu Yuánshēn) (1924-), also known as Y.S.Chow or Zhou Yuanshen, is a Chinese American probabilist. Currently he is Professor Emeritus, Columbia University, USA.He is the former director-general of the Institute of Mathematics, Academia Sinica, and the director of the Center of Applied Statistics, Nankai University (Tianjin). He is an academician of the Academia Sinica.