Allister "Allie" Johnston (March 19, 1908 – August 21, 2005) was a politician in Ontario, Canada.
He was a Progressive Conservative member of the Legislative Assembly of Ontario from 1948 to 1971 who represented the riding of Parry Sound.
After the war, Johnston established an insurance company in South River, W.A.
He was active in a wide variety of charitable organizations, including serving as President of the local branch of the Royal Canadian Legion.
In addition to his service on Legislative Committees, he was appointed as a Commissioner on the Ontario Northland Transportation Commission.