Arthur "Art" Johnston (born August 3, 1947) is a Canadian politician.
Johnston was a Member of the Legislative Assembly of Alberta representing the constituency of Calgary-Hays as a Progressive Conservative.
In 1979 he attended the University of New Brunswick before starting a 25-year career with the Calgary Police Service (CPS).
[citation needed] Johnston first sought public office in the 2001 Calgary municipal election as alderman for Ward 12.
Defeat in the aldermanic race did not deter him from later seeking election provincially in the constituency of Calgary-Hays in 2004.