Kenneth Roy Thomson, 2nd Baron Thomson of Fleet, known in Canada as Ken Thomson, was a Canadian/British businessman and art collector. At the time of his death, he was listed by Forbes as the richest person in Canada and the ninth richest person in the world, with a net worth of approximately US $19.6 billion.

Roy Herbert Thomson, 1st Baron Thomson of Fleet, was a Canadian-born British newspaper proprietor who became one of the moguls of Fleet Street in London.