Lucien Rault (born 30 March 1936 in Plouguenast) is a French long-distance runner. He represented France in the 1976 Olympics at the age of 40. He had an extensive career in cross country running with his national squad at the International Cross Country Championships and then the IAAF World Cross Country Championships. Five days before his 42nd birthday, he was the #2 runner on the French World Championship team at the 1978 IAAF World Cross Country Championships, his first world championship.