Chai Trong-rong (Chinese: ???; pinyin: Cà i Tóngróng; Wade–Giles: Ts‘à i4 T‘ung2-jung2; Pe?h-oe-ji: Chhòa Tông-êng; 13 June 1935 – 11 January 2014), sometimes known in English as Trong Chai, was a Taiwanese politician.
Born in Japanese-era Taiwan, Chai earned his master's and doctorate degrees in the United States.
He was a pro-democracy advocate and founded the Association for a Plebiscite (Chinese: ???????; pinyin: GongmÃn Tóupiaò Cùjìnhùi) and Formosa Television.A member of the Democratic Progressive Party (DPP), Chai was elected a national-level legislator multiple times, serving in the Legislative Yuan from 1993 to 1996 and again from 1997 to 2012.
He took part in three of the DPP chairmanship elections.