The article emphasizes the fact that industry clusters, as organisations, composing of various subsystems through mutual cooperation, are able to successfully attain the established objectives. Their capability to work efficiently is determined, however, by the quantity and quality of the knowledge they possess.Knowledge, as a component of intellectual capital, is currently the key strategic resource of clusters. Even more crucial is the way in which a manager of a cluster achieves, processes, transfers, and protects the knowledge. Assuming that knowledge management influences the results of a cluster, the article determines the significance of this process, and indicates the need for ceaseless development.