Jeffrey Koo, Sr. (Chinese: 辜濂松; pinyin: Gū Líansōng; September 8, 1933 – December 6, 2012) was a Taiwanese banker and the chairman of Chinatrust, a financial holding company.
Koo was born in 1933 in Taichū Prefecture in Japanese Taiwan. He graduated from Soochow University in Taipei in 1957 with a BA in accounting, moved to New York (lived in Brooklyn Heights) and graduated from New York University in 1962 with a MBA.
Koo was a nephew of Koo Chen-fu (founder of Koos Group) and Koo Kwang-ming.
Koo had a daughter and three sons, the eldest being Jeffrey Koo Jr.. All his children have connections to Chinatrust.
Koo founded what is now Chinatrust Commercial Bank with Koo Chen-fu in 1966.
In June 2008, Forbes ranked him as the sixth richest individual in Taiwan, with a net worth of US$ 2.8 billion. He is also an alumnus of Eisenhower Fellowships and a member of the Board of Trustees.
Koo went to New York City for treatment for Parkinson's and died at the Memorial Sloan-Kettering Cancer Center on December 6, 2012. Koo is survived by his wife, three sons and a daughter.