Cheng Tzu-tsai (Chinese: 鄭自才; pinyin: Zhèng Zìcái; Pe̍h-ōe-jī: Tēⁿ Chū-châi, born 鄭自財 on 1 December 1936; also known as TT Deh) is a Taiwan-born architect and dissident who conspired with others in the of Chiang Ching-kuo, the son of Chiang Kai-shek, in New York City.