Gǔ () is a Chinese surname meaning 'old' or 'ancient'.
Notable people Gu Long (古龍), pen name of Xiong Yaohua (1938–1985), Chinese novelist, screenwriter, film producer and director based in Taiwan Leo Ku (古巨基; born 1972), Hong Kong Cantopop and Mandopop singer, actor, TV host, model, cartoonist, MV director, producer and designer Ku Chin-shui (古金水, 1960–2016), Amis Taiwanese decathlete and pole vaulter Gu Li (古力; Pinyin: Gǔ Lì; born 1983), Chinese professional Go player Louis Koo (古天樂; born 1970), Hong Kong actor and film producer Ko Tin Lung (古天農, 1954–2022), Hong Kong film producer Koo Sze-yiu (古思堯; born 1949), Hong Kong activist and politician Victor Koo or Gu Yongqiang (古永鏘; pinyin: Gǔ Yǒngqiāng; born 1966), Chinese businessman Koh Nai Kwong (古乃光; born 1961), Malaysian politician and lawyer Koo Kien Keat (古健傑; born 1985), Malaysian former professional badminton player