Robert Matthew Turnbull McDonald (26 September 1931 – 9 June 2002) was a Canadian professional football player, businessman, insurance agent, public servant and politician.
McDonald served as a Progressive Conservative party member of the House of Commons of Canada.
As the 1957 federal election approached, the Progressive Conservative party recruited McDonald as their candidate in the Hamilton South riding.
On election day, 10 June 1957, a 25-year-old McDonald defeated Liberal party incumbent Russell Reinke as part of an Ontario sweep by the Tories, helping John Diefenbaker win a minority government.
After leaving federal politics, in 1964, McDonald became a Hamilton school trustee and returned to business for a decade, running Crystal Glass and Plastics.