Let G be a finite subgroup of Sp(2n, C) acting by automorphisms in the Weyl algebra A n (C). We compute the Hochschild homology and cohomology groups of the invariant algebra A n (C) G. Ce texte est consacré au calcul de l'homologie et de la cohomologie de Hochschild des invariants de l'algèbre de Weyl A n = A n (C) sous l'action d'un sous-groupe fini G d'automorphismes contenu dans le groupe symplectique Sp(2n, C). Ce travail complète les calculs de [3], qui traitaient le cas du premier groupe d'homologie de Hochschild. Un exemple d'emploi de ce théorème est proposé en fin d'article.
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