James Merritt Harrison, CC (September 20, 1915 – July 6, 1990) was a Canadian scientist and public servant.
He was the Director of the Geological Survey of Canada from 1956 to 1964, and Assistant Deputy Minister of the Department of Energy, Mines and Resources.
In 1969, Harrison was awarded the Logan Medal, the Geological Association of Canada's highest honour.
From January 1973 to March 1976, he was the Assistant Director-General for Natural Sciences at the United Nations Educational, Scientific and Cultural Organization in Paris.
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