Koo Hsien-jung (Chinese: 辜顯榮; pinyin: Gū Xiǎnróng; Wade–Giles: Ku1 Hsien3-jung2; Pe̍h-ōe-jī: Ko͘ Hián-êng; Japanese: 辜 顕栄; Romaji: Ko Ken’ei; 2 February 1866 – 9 December 1937) was a Taiwanese businessman and politician who enjoyed strong links to the colonial administration of Taiwan under Japanese rule.

Koo was a businessman at the time of the Treaty of Shimonoseki in which Qing dynasty China ceded Taiwan to Japan.

Koo's close links to the Japanese allowed him both to pursue a successful political career (he became the first Taiwanese to be appointed by the emperor to the House of Peers of Japan, in 1934) and to build a collection of businesses that formed the nucleus of today's Koos Group of companies.

His fifth son, Koo Chen-fu, inherited control of his father's business and served as the negotiator for Taiwan during the Wang–Koo summit.

His grandson is Richard Koo, an economist specializing in balance sheet recessions.