Sidney Hsu-Hsin Chang (simplified Chinese: ???; traditional Chinese: ???; pinyin: Zhang Xùxin; January 1, 1934 – October 3, 2016) was an American historian, author, and academic specializing in the history of China, modern Far East, and East Asian civilizations.
For nearly half a century he was a professor at California State University, Fresno.
He was a visiting professor at National Chengchi University in Taipei, Taiwan.