Koh Tsu Koon (born 26 August 1949; simplified Chinese: ???; traditional Chinese: ???; pinyin: Xu Zigen; Pe?h-oe-ji: Khó Chú-kun) is a Malaysian politician.
He was the Chief Minister of Penang from 1990 to 2008 and was appointed as a Senator; 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.
He was famously known for contributing in "Sungai Pinang" campaign where he took almost 10 years and failed to complete it.
He was the fourth president of Parti Gerakan Rakyat Malaysia (Gerakan), a member of the opposition Barisan Nasional (BN) coalition, and also the first President of Gerakan not named a candidate in the Malaysian General Election.