John Duff Robertson (March 26, 1873 - 1939[1]) was a druggist and political figure in Saskatchewan. He represented Canora in the Legislative Assembly of Saskatchewan from 1908 to 1917 as a Liberal.
He was born in Chesterfield, Oxford County, Ontario, the son of the Reverend William Robertson and Elizabeth Duff,[2] and educated in Elora and at the Ontario College of Pharmacy in Toronto. He lived in Canora, Saskatchewan.[3]
His brother William was a physician in Elora, Ontario,[2] whose daughter Marion married and later divorced Frederick Banting.[4]