Wellington Koo (Chinese: 顧立雄; pinyin: Gù Lìxióng; born 31 October 1958) is a Taiwanese lawyer and politician. During his legal career, Koo represented several politicians. His own political career began with a term on the National Assembly, followed by an unsuccessful campaign for the Taipei mayoralty in 2013. In 2016, he was elected a legislator at large representing the Democratic Progressive Party. Koo left the Legislative Yuan to lead the Ill-gotten Party Assets Settlement Committee. In 2017, he became chairman of the Financial Supervisory Commission. Koo was appointed Secretary-General of the National Security Council in 2020.