Douglas Scott Harkness (March 29, 1903 - May 2, 1999), P.C., O.C., G.M., E.D., B.A., D.U.C. was a Canadian politician, teacher, farmer and former Lieutenant Colonel in Royal Canadian Artillery.

He was born in Toronto, Ontario and moved to Calgary, Alberta in 1929. He graduated from the University of Alberta, then farmed and taught school in the vicinity of Red Deer. He taught at Crescent Heights High School until 1939.

He fought during World War II and in 1943 was awarded the George Medal for "courage, gallantry and devotion to a duty of a high order" while commanding troops during the Sicilian campaign.

In 1945, he was elected to the House of Commons for the constituency of Calgary East and had various ministerial positions under the government of John Diefenbaker.

He lived in Calgary until his death in 1999.

In 1978 he was made a Companion of the Order of Canada. The Douglas Harkness Community School in Calgary is named in his honour.

Parlimentary functions

• Minister of Agriculture (Acting), (1957.06.21 - 1957.08.06)
• Minister of Northern Affairs and National Resources, (1957.06.21 - 1957.08.18)
• Minister of Agriculture, (1957.08.07 - 1960.10.10)
• Minister of National Defence, (1960.10.11 - 1963.02.03)

|- style="text-align: center;" | width="30%" |Preceded by:
The electoral district was created in 1952. | width="40%" style="text-align: center;" |Member of Parliament for Calgary North
1953-1968 | width="30%" |Succeeded by:
Eldon Woolliams

|- style="text-align: center;" | width="30%" |Preceded by:
The electoral district was created in 1966. | width="40%" style="text-align: center;" |Member of Parliament for Calgary Centre
1968-1972 | width="30%" |Succeeded by:
Harvie Andre