Sin Chung-kai, SBS, JP (Chinese: ???) (born 15 June 1960, in Hong Kong with family roots in Dongguan, Guangdong) is a former member of Hong Kong Legislative Council and former member of Kwai Tsing District Council.
He was one of two vice-chairmen of the Democratic Party until December 2012, but now serves as a member of the Executive Committee.
In December 2012, he contested in the leadership election of the party, losing narrowly by 133 votes to 149 for Emily Lau, following the resignation of Albert Ho in the aftermath of the 2012 Legislative Council election.In his professional life he was an IT manager at HSBC.