Douglas Scott Harkness OC GM ED PC (29 March 1903 – 2 May 1999) was a Canadian politician.

He graduated from the University of Alberta, then farmed and taught school in the vicinity of Red Deer.

[1] In 1943 was awarded the George Medal "in recognition of conspicuous gallantry in carrying out hazardous work in a very brave manner".

[1] He precipitated a political crisis when he resigned from cabinet in February 1963 to protest Diefenbaker's opposition to stationing American nuclear warheads in Canada.

The resignation precipitated a split in the cabinet and contributed to the defeat of the government in the 1963 federal election.