F. Bergeron, D. Krob Acyclic complexes related to noncommutative symmetric functions Cet article est consacré à la construction de plusieurs struc­ tures de complexes acycliques sur l'algèbre des fonctions symétriques non commutatives. Ces complexes sont intimement liés à la combinatoire des rubans. This paper is devoted to the construction of several structures of acyclic complexes related with the algebra of noncommutative symmetric functions. These complexes are closely related to the fine combinatorics of ribbons.