John Cornwall is the name of: John Cornwall (Upper Canada politician), farmer and political figure in Upper Canada John Cornwall (c. 1366–1414), MP for Shropshire 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) (1935–2018), former member of the South Australian Legislative Council See also John of Cornwall (disambiguation), multiple people John Cornwell (disambiguation), multiple people