In this paper, we study some cards shuffles which are used by magicians. We focus ourselves on the possibility to hit eventually the initial state after several shuffles. This is a classical problem arising in discrete dynamical systems. The computations are performed through an elementary approach, so the paper is easily accessible. ----- Dans cet article, on \'etudie quelques m\'elanges de cartes bien connus du monde de la magie. On examine en d\'etail l'\'eventualit\'e de reconstituer le jeu de cartes initial apr\`es plusieurs m\'elanges cons\'ecutifs. Il s'agit math\'ematiquement d'un probl\`eme de syst\`emes dynamiques discrets pour lequel on recherche explicitement une p\'eriode. Les calculs \'etant pr\'esent\'es de mani\`ere \'el\'ementaire, l'article se veut accessible \`a un large public.
Categories: math.HO