John Platt
John Platt may refer to:
- John Platt (settler), early settler of Norwalk, Connecticut
- John Platt (sculptor), English sculptor
- John Platt (MP), English manufacturer of textile machinery and Liberal politician
- John Milton Platt, physician and political figure in Ontario, Canada
- John Platt (artist), English artist
- John R. Platt, American physicist and biophysicist
- John Platt (footballer), English goalkeeper
- John Platt (computer scientist), Google scientist
- John Talbot Platt, Australian linguist who documented the Kokatha dialect
- John P. Platt, American geologist and educator