Léon Scieur (pronounced [le.ɔ̃ sjœʁ]; 19 March 1888 – 7 October 1969) was a Belgian cyclist who won the 1921 Tour de France, along with stages 3 and 10. His first great victory was the 1920 Liège–Bastogne–Liège; he won a stage and finished fourth in the 1919 and 1920 Tours de France.