Tan Sri Dr. Koh Tsu Koon (born 26 August 1949; simplified Chinese: 许子根; traditional Chinese: 許子根; pinyin: Hsǔ Zǐgēn; Pe̍h-ōe-jī: Khó Chú-kun) is a Malaysian politician. He was the Chief Minister of Penang from 1990 to 2008 and is currently a member of the Dewan Negara, the upper house of the Malaysian Parliament. In April 2009, Koh was appointed Minister in the Prime Minister's Department by Prime Minister Najib Tun Razak.