Desmond "Des" Ronald Thomson (born 22 August 1942) is a former racing cyclist from New Zealand. He won the silver medal in the men's road race at the 1966 British Empire and Commonwealth Games. He went to two Olympics in 1964 and 1968 competing in the men's road race and team time trial. In the men's road race, he finished 61st in 1964 and 52nd in 1968. His brother Richie Thomson was also a New Zealand representative cyclist competing at two Commonwealth Games and the 1968 Olympic Games.