Hsu Tain-tsair (Chinese: 許添財; pinyin: Xǔ Tiāncái; Wade–Giles: Hsǔ Tiēn-tsái; Pe̍h-ōe-jī: Khó͘ Thiam-châi; born 23 January 1953) is a Taiwanese politician who served as the mayor of Tainan City from 2001 to 2010. Born in Tainan County (now part of Tainan City), Hsu got his PhD candidacy in economics in the United States, where he started participating in the independence movement of Taiwan. He was placed on the blacklist of Kuomintang and was not allowed to return to Taiwan until 1990.