  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.
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  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.
