Addison Alexander MacKenzie, MC (1 November 1885 – 13 May 1970) was a Canadian politician, who represented York North in the Legislative Assembly of Ontario from 1945 to 1967 as a Progressive Conservative member.

[1] In 1914, at the start of First World War, he enlisted in the 4th Battalion, Canadian Mounted Rifles and quickly rose to the rank of Major, due to his previous experience serving in the militia (The Governor General's Body Guard).

He ran as the Progressive Conservative candidate in York North in 1943 but was defeated by CCF member, George Mitchell.

[1] After retiring from politics, MacKenzie sat on the Board of the Metropolitan Toronto Conservation Authority and he was a charter member of the Woodbridge Horticultural Society.

[1] In recognition of his long public service, Major Mackenzie Drive, a main east–west thoroughfare in York Region, and Alexander Mackenzie High School, in Richmond Hill, Ontario, were named after him, as is Royal Canadian Legion Branch 414, in Woodbridge, Vaughan.