John Liu may refer to:
John Liu (born 1967), member of the New York State Senate’s 11th district John Liu Shi-gong (1928–2017), Chinese Roman Catholic bishop John Baptist Liu Jingshan (1913–2013), Chinese Roman Catholic bishop John Liu (actor), Taiwanese martial artist/actor, who appeared in various Chinese and Korean films in the 1970s through 1990s John C. Liu, founder of Firstrade Securities John D. Liu, film maker and ecologist