John Lorne MacDougall (18 November 1898 – 6 June 1956) was a Liberal party member of the House of Commons of Canada.
He fought in World War I in the same army unit as fellow House of Commons member John Diefenbaker.
Due to injuries sustained in the war, MacDougall was unable to continue dentistry and moved towards other jobs such as a Liberal Party organizer in British Columbia.
In June 1956 MacDougall collapsed from a heart attack in Parliament's Centre Block building and died on the scene.
MacDougall was part of a stressful parliamentary debate regarding the Trans-Canada Pipeline which resulted in three other Members of Parliament being admitted to hospital.