This chapter provides an overview of ocean data legislation in the context of EU maritime policy. Its analyses give an insight into the implementation of the regulations, directives, decisions, and recommendations that address the European Union's approach to the management of its ocean resources. Methods adopted by European legislators to foster collaboration and innovation and harness ocean data to inform policymakers and other stakeholders are discussed. It provides an overview of how the EU has adapted its legal framework to the changing landscape of data management in ocean research and resource management. This insight is given within the specific geographical context of the European Atlantic and Mediterranean regions, allowing readers to understand how these legal responses to the data revolution impact their seas. This chapter could be a valuable resource for those interested in the particular interplay between regulations, data, and the changing landscape of fisheries management in the European Union.