Chen Tang-shan or Mark Chen (Chinese: 陳唐山; pinyin: Chén Tángshān), born September 16, 1935, in Tainan Prefecture (now part of Tainan City), Taiwan, is a Taiwanese politician, former Secretary-General of the Office of the President of the Republic of China (Taiwan) under ex-President Chen Shui-bian. He was also previously Foreign Minister of the ROC from 2004 to 2006 (the first Democratic Progressive Party member to occupy the position).