Tun Tan Siew Sin (Chinese: 陈修信; pinyin: Chén Xīuxìn; Pe̍h-ōe-jī: Tân Siu-sìn; 21 May 1916– 17 March 1988) was Malaya's (later Malaysia's) first Minister of Commerce and Industry, Finance Minister for 15 years, and president of the Malayan Chinese Association (MCA, later Malaysian Chinese Association).