Donald McDonald Hogarth DSO (June 15, 1879 – June 27, 1950) was a politician and mining financier from Ontario, Canada. He was a member of the Legislative Assembly of Ontario representing the riding of Port Arthur from 1911 to 1923 and again from 1923 to 1926. He served with the Canadian Army in World War I where he achieved the rank of Major-General. He was a well-known mining financier who founded some of the biggest gold mines in Northern Ontario.