John Law may refer to:

• John Law (artist) (born 1958), American artist
• John Law (comics), comic-book character created by Will Eisner
• John Law (film director), Hong Kong film director
• John Law (musician) (born 1961), British jazz pianist and composer
• John Law (novel), an 1864 novel by William Henry Ainsworth
• John Law (writer) (1929–1970), British TV comedy writer
• John Law, pseudonym of Margaret Harkness (1854–1923), English journalist and writer
• John Phillip Law (1937–2008), American film actor
• "John Law", a song by Dropkick Murphys first released on The Singles Collection, Volume 1

• John Law (New Zealand politician), mayor of Rodney District in New Zealand
• John Law (representative) (1796–1873), U.S. Representative from Indiana
• John Martin Law Jr. (1903–1981), mayor of Eau Gallie, Florida, from 1943 to 1950

• John Law (bishop) (1745–1810), English mathematician and Church of Ireland bishop
• John Law (priest) (1739–1827), Anglican priest
• John Law (minister) (died 1712), Scottish minister

• John Law (economist) (1671–1729), Scottish economist
• John Law (sociologist) (born 1946), sociologist at the Open University

• John B. Law, head college football coach for the Manhattan College Jaspers, New York, 1930–1931
• John Law (Australian footballer) (born 1959), Australian rules footballer
• John Law (American football) (1905–1962), American football player
• John Law (footballer, born 1887) (fl. 1887–1914), Scottish footballer
• John Law (cricketer), English cricketer

• John Laws (born 1935), Australian radio broadcaster
• John Laws (judge) (1945–2020), English judge
• John Lowe (disambiguation)