John Platt may refer to:
John Platt (settler) (1632–1705), early settler of Norwalk, Connecticut John Platt (sculptor) (1728–1810), English sculptor John Platt (MP) (1817–1872), English manufacturer of textile machinery and Liberal politician John Milton Platt (1840–1919), physician and political figure in Ontario, Canada John Platt (artist) (1886–1967), English artist John R. Platt (1918–1992), American physicist and biophysicist John Platt (footballer) (born 1954), English goalkeeper John Platt (computer scientist) (born 1963), Google scientist John Talbot Platt (published from 1960s, died 1990), Australian linguist who documented the Kokatha dialect John P. Platt (), American geologist and educator
See also Jon Platt (born 1964), U.S. music executive Platt Brothers John Platts (disambiguation) John Platts-Mills (1906–2001), British Labour Party politician