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Since the beginning of the 2000s, globalization, the increase in sea traffic, and technological developments have forced the big seaports to create new management forms, which have to deal with the requirements of both competitiveness and sustainable development. Harbor reforms are implemented, and an environmental consciousness grows in these spaces, as does the participation of the population in the debates about equipment projects. This creates a context favorable to the expression of actors’ plurality, with divergent opinions and interests about the future of the ports. Industrial port management and activities come up against other uses and territorial claims, creating a series of oppositions, interconnected and linking local and global issues. The aim of this paper is to highlight territorialized conflict systems, through a comparative study of the environmental and territorial conflicts, over a decade, linked to three French big maritime ports (Dunkirk, Le Havre, and Marseille-Fos). This study offers a framework for analyzing the objects of oppositions, protagonists, and their strategies, in order to identify the recurrences and differences existing between the conflicts, to progress in modeling the antagonistic dynamics, and explore the management of the conflicts by port authorities.