Sin Chung-kai, SBS, JP (Chinese: 單仲偕) (born 15 June 1960, in Hong Kong with family roots in Dongguan, Guangdong) is a 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.