Roger De Breuker (Grobbendonk, 13 July 1940) was a Belgian professional road bicycle racer. De Breuker's only Tour de France that he participated in was the 1963 Tour de France, where he won 2 stages. The 1963 Tour de France was the 50th Tour de France, taking place June 23 to July 14, 1963. The total race distance was 21 stages over 4137 km, with riders averaging 37.092 km/h. Stages 2 and 6 were both two part stages, the first half being a regular stage and the second half being a team or individual time trial. The Tour organisers were trying to break the dominance of Anquetil, who had won already three Tours, by reducing the time trials length to only 79 km, so that the climbing capabilities would be more important.