This chapter examines the role of industry self-regulation in relation to international maritime law. While multilateral intergovernmental agreements are important to encouraging regulatory harmonisation, private actors have an essential role in industry, both in developing norms and in making rules and standards effective to ensure safe and secure shipping on clean oceans. Nonetheless, private actors are often overlooked and yet to be placed in the context of international maritime law and especially the United Nations Convention of Law of the Sea (UNCLOS). This chapter does so by analysing industry self-regulation in relation to UNCLOS, flag states and the International Maritime Organization (IMO) respectively.