Aloïs Klensch was a competitive cyclist from Luxembourg who was active in the late 1930s. In 1936 Klensch was selected to ride in the road race at the Berlin Olympics but he did not start the event. Despite missing out on the Games, he then had the biggest win of his career with victory in the 1937 edition of the Grand Prix François Faber one-day race. That same year Klensch also rode in the Tour de France but finished in last place in the general classification, known as the lanterne rouge. Before the war ended his career Klensch finished second in the road race at the 1939 Luxembourg national championships.