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Soit $\pi$ un module de plus haut poids unitaire du groupe $G=Sp(2n,\mathbbR)$. On s'int\'eresse aux paquets d'Arthur contenant $\pi$. Lorsque le plushaut poids est scalaire, on d\'etermine les param\`etres de ces paquets, on\'etablit la propri\'et\'e de multiplicit\'e un de $\pi$ dans le paquet, etl'on calcule le caract\`ere $\rho_\pi$ (du groupe des composantes connexes ducentralisateur du param\`etre dans le groupe dual) associ\'e \`a $\pi$ et quijoue un grand r\^ole dans la th\'eorie d'Arthur. On fait de m\^eme pourcertains modules de plus haut poids unitaires unipotents $\sigma_{n,k}$.  Let $\pi$ be an irreducible unitary highest weight module for $G=Sp(2,\mathbbR)$. We would like to determine the Arthur packets containing $\pi$. When thehighest weight is scalar, we determine the Arthur parameter of these packets,we establish the multiplicity one property of $\pi$ in the packet and wecompute the character $\rho_\pi$ (of the group of connected components of thecentralizer of $\psi$ in the dual group) associated to $\pi$ which plays animportant role in Arthur's theory. We also deal with the case of some unipotentunitary highest weight modules $\sigma_{n,k}$.

Sur les paquets d'Arthur de $\mathbf{Sp}(2n,\mathbb{R})$ contenant des modules unitaires de plus haut poids, scalaires