John Platt may refer to: John Platt (artist) (1886—1967), English artist John Platt (computer scientist), Google scientist John Platt (footballer), English goalkeeper John Platt (MP) (1817-1872), English manufacturer of textile machinery and Liberal politician John Platt (settler) (1632–1705), early settler of Norwalk, Connecticut John Milton Platt (1840–1919), physician and political figure in Ontario, Canada John R. Platt (1918-1992), American physicist and biophysicist