John Lorn McDougall CMG (November 6, 1838 – January 15, 1909) was an Ontario businessman and political figure. He represented Renfrew South in the Legislative Assembly of Ontario from 1867 to 1871 and in the House of Commons of Canada as a Liberal from 1869 to 1872 and from 1874 to 1878. He was appointed CMG in the 1897 Diamond Jubilee Honours.