Wishart McLea Robertson, PC (February 15, 1891 – August 16, 1967) was a politician in Nova Scotia, Canada.
In 1918, he returned to Canada following World War I, and entered the automobile industry.
He was active in the civil section of the North Atlantic Treaty Organization (NATO) and helped establish international parliamentary groups to help set out the political, economic, and social goals of NATO.
Senator Robertson was Chairman of the founding conference and was elected Honorary Life President of the international association.
Robertson's term as the Senate's speaker ended with the defeat of the Liberal government in the 1957 election.