Robert Holmes "R. H." Thomson, CM (born September 24, 1947) is a Canadian television, film and stage actor.

Thomson was born in Richmond Hill, Ontario. He studied at the University of Toronto, and the National Theatre School. His own play The Lost Boys was staged at the Great Canadian Theatre Company in March 2000 and at Canadian Stage in February 2002. Thomson has also hosted programming for CBC Radio and CBC Television. In 2010, he was appointed a Member of the Order of Canada.

Thomson has portrayed a number of historical figures including Charlie Grant, Samuel Lount, Edsel Ford, Dr. Frederick Banting, Duncan Campbell Scott, Mitchell Sharp, and James Cross.

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