Cheng Chung-tai (Chinese: 鄭松泰; born 5 November 1983) is a Hong Kong academic, social activist, and politician. After winning a seat in the New Territories West constituency in the 2016 legislative election, he took over from Wong Yeung-tat as chairman of Civic Passion until the dissolution in 2021. Until being disqualified in August 2021, he was the only opposition member in the Legislative Council amid the mass resignation of pro-democracy legislators.