Abstract. Recent years have witnessed a profound evolution of ports, induced by a wide range of factors, such as: (a) technological developments in shipping, cargo-handling and storage equipment, and information and communication systems; (b) changing patterns of international trade; (c) a broadening complexity of global supply chains; and (d) a changing governance models of the port as a consequence of the process of privatization in Europe. The growing size and complexity of port functions have inspired an ever more interesting and useful scientific debates on the social, economic and environmental effects of these transformations, and, more specifically, on the relationship between the port and the city. The paper addresses, to this end, an emerging managerial perspective in the decision making process of Port Authority: the network. This perspective allows to understand the nature of relationship networks shaping the competitive and cooperative dynamics of the port and to identify the boundaries for an active role of the Port Authority in defining the sustainable development of port within its own territory.