Richard Tsoi Yiu-cheong (Chinese: 蔡耀昌; born 11 September 1967) is a Hong Kong politician and the former vice-chairman of the Democratic Party. He ran for many Legislative Council and District Council elections and was elected as Sha Tin District Councillor in 2003. On March 5, 2020, Tsoi resigned from duties after joint petition from colleagues against his criticism of local restaurants being discriminatory towards Mainland Chinese amid the coronavirus epidemic. Tsoi has been active in many pressure groups and protests of the pro-democracy camp.