John Cornwall is the name of:
- John Cornwall (Upper Canada politician), farmer and political figure in Upper Canada
- John Cornwall (MP) (c.1366-1414), MP for Shropshire (UK Parliament constituency)
- John Cornwall (died 1608), MP for Marlborough (UK Parliament constituency)
- John Cornwall, 1st Baron Fanhope (died 1443), English nobleman, soldier and one of the most respected chivalric figures of his era
- John Cornwall (South Australian politician) (born 1935), former member of the South Australian Legislative Council
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