Seng Han Thong (Chinese: 成汉通; pinyin: Chéng Hàntōng; born 22 April 1950) is a Singaporean former politician. A member of the governing People's Action Party (PAP), he was a Member of Parliament representing the Yio Chu Kang ward of Ang Mo Kio GRC from 1997 to 2006, and Yio Chu Kang SMC from 2006 to 2011.