John Lorn McDougall CMG (November 6, 1838 – January 15, 1909) was an Ontario businessman and political figure.

[1] 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 born in Golden Lake, Ontario, Upper Canada in 1838, the son of John Lorn McDougall, Sr.

His lumber business failed in 1878 and, shortly afterward, he was named to the post of Auditor General of Canada.

His attention to detail, efforts to tighten controls on government spending, and persistence ruffled some feathers, but ultimately helped establish the importance of this role.